diff --git a/examples/platforms/nrf528xx/nrf52840/Makefile.platform.am b/examples/platforms/nrf528xx/nrf52840/Makefile.platform.am
index 10c191ab2..4e28e5884 100644
--- a/examples/platforms/nrf528xx/nrf52840/Makefile.platform.am
+++ b/examples/platforms/nrf528xx/nrf52840/Makefile.platform.am
@@ -46,7 +46,7 @@ LDADD_COMMON
     $(top_srcdir)/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a        \
     $(top_srcdir)/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a       \
     $(top_srcdir)/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a       \
-    $(top_srcdir)/third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.1.a   \
+    $(top_srcdir)/third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.2.a   \
     $(NULL)
 endif
 
diff --git a/examples/platforms/nrf528xx/nrf52840/README.md b/examples/platforms/nrf528xx/nrf52840/README.md
index 1b6eca2a8..481513faf 100644
--- a/examples/platforms/nrf528xx/nrf52840/README.md
+++ b/examples/platforms/nrf528xx/nrf52840/README.md
@@ -144,7 +144,7 @@ When building an external application with OpenThread libraries and CryptoCell 3
   - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a`
   - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a`
   - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a`
-  - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.1.a`
+  - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.2.a`
 - Include directories:
   - `third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_platform_config`
   - `third_party/NordicSemiconductor/libraries/nrf_security/include`
@@ -209,7 +209,7 @@ When building an external application that uses RTOS with OpenThread libraries a
   - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a`
   - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a`
   - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a`
-  - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.1.a`
+  - `third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.2.a`
 - Include directories:
   - `third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_platform_config`
   - `third_party/NordicSemiconductor/libraries/nrf_security/include`
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/config/nrf-config.h b/third_party/NordicSemiconductor/libraries/nrf_security/config/nrf-config.h
index a9c6ea416..777591efa 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/config/nrf-config.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/config/nrf-config.h
@@ -1168,7 +1168,7 @@
  *
  * Uncomment to enable the smaller implementation of SHA256.
  */
-#define MBEDTLS_SHA256_SMALLER
+/* #undef MBEDTLS_SHA256_SMALLER */
 
 /**
  * \def MBEDTLS_SSL_ALL_ALERT_MESSAGES
@@ -2489,7 +2489,7 @@
  *
  * Uncomment to enable generic public key write functions.
  */
-/* #undef MBEDTLS_PK_WRITE_C */
+#define MBEDTLS_PK_WRITE_C
 
 /**
  * \def MBEDTLS_PKCS5_C
@@ -3191,6 +3191,13 @@ it is (2^48 - 1), our restriction is :  (int - 0xFFFF - 0xF).*/
  */
 /* #undef MBEDTLS_AES_256_CMAC_C */
 
+/*
+ * Nordic added. Ensure there is a definition of mbedtls_ecp_restart_ctx
+ */
+#if defined(MBEDTLS_ECP_ALT) && !defined(MBEDTLS_ECP_RESTARTABLE)
+typedef void mbedtls_ecp_restart_ctx;
+#endif
+
 
 
 #include "mbedtls/check_config.h"
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bignum.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bignum.h
index 1c8607264..22b373113 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bignum.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bignum.h
@@ -184,7 +184,7 @@ extern "C" {
  */
 typedef struct mbedtls_mpi
 {
-    int s;              /*!<  integer sign      */
+    int s;              /*!<  Sign: -1 if the mpi is negative, 1 otherwise */
     size_t n;           /*!<  total # of limbs  */
     mbedtls_mpi_uint *p;          /*!<  pointer to limbs  */
 }
@@ -559,6 +559,24 @@ int mbedtls_mpi_cmp_abs( const mbedtls_mpi *X, const mbedtls_mpi *Y );
  */
 int mbedtls_mpi_cmp_mpi( const mbedtls_mpi *X, const mbedtls_mpi *Y );
 
+/**
+ * \brief          Check if an MPI is less than the other in constant time.
+ *
+ * \param X        The left-hand MPI. This must point to an initialized MPI
+ *                 with the same allocated length as Y.
+ * \param Y        The right-hand MPI. This must point to an initialized MPI
+ *                 with the same allocated length as X.
+ * \param ret      The result of the comparison:
+ *                 \c 1 if \p X is less than \p Y.
+ *                 \c 0 if \p X is greater than or equal to \p Y.
+ *
+ * \return         0 on success.
+ * \return         MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the allocated length of
+ *                 the two input MPIs is not the same.
+ */
+int mbedtls_mpi_lt_mpi_ct( const mbedtls_mpi *X, const mbedtls_mpi *Y,
+        unsigned *ret );
+
 /**
  * \brief          Compare an MPI with an integer.
  *
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bn_mul.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bn_mul.h
index c33bd8d4a..748975ea5 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bn_mul.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/bn_mul.h
@@ -642,7 +642,8 @@
            "r6", "r7", "r8", "r9", "cc"         \
          );
 
-#elif defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
+#elif (__ARM_ARCH >= 6) && \
+    defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
 
 #define MULADDC_INIT                            \
     asm(
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/check_config.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/check_config.h
index b86e5807e..d076c2352 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/check_config.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/check_config.h
@@ -123,7 +123,7 @@
 #error "MBEDTLS_ECDSA_DETERMINISTIC defined, but not all prerequisites"
 #endif
 
-#if defined(MBEDTLS_ECP_C) && ( !defined(MBEDTLS_BIGNUM_C) || (   \
+#if defined(MBEDTLS_ECP_C) && ( !defined(MBEDTLS_BIGNUM_C) || (    \
     !defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) &&                  \
     !defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) &&                  \
     !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) &&                  \
@@ -134,7 +134,9 @@
     !defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)   &&                  \
     !defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) &&                  \
     !defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) &&                  \
-    !defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) ) )
+    !defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) &&                  \
+    !defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) &&                 \
+    !defined(MBEDTLS_ECP_DP_CURVE448_ENABLED) ) )
 #error "MBEDTLS_ECP_C defined, but not all prerequisites"
 #endif
 
@@ -279,6 +281,14 @@
 #error "MBEDTLS_MEMORY_BUFFER_ALLOC_C defined, but not all prerequisites"
 #endif
 
+#if defined(MBEDTLS_MEMORY_BACKTRACE) && !defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#error "MBEDTLS_MEMORY_BACKTRACE defined, but not all prerequesites"
+#endif
+
+#if defined(MBEDTLS_MEMORY_DEBUG) && !defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#error "MBEDTLS_MEMORY_DEBUG defined, but not all prerequesites"
+#endif
+
 #if defined(MBEDTLS_PADLOCK_C) && !defined(MBEDTLS_HAVE_ASM)
 #error "MBEDTLS_PADLOCK_C defined, but not all prerequisites"
 #endif
@@ -691,7 +701,7 @@
 /*
  * Avoid warning from -pedantic. This is a convenient place for this
  * workaround since this is included by every single file before the
- * #if defined(MBEDTLS_xxx_C) that results in emtpy translation units.
+ * #if defined(MBEDTLS_xxx_C) that results in empty translation units.
  */
 typedef int mbedtls_iso_c_forbids_empty_translation_units;
 
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/config.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/config.h
index 654f9725e..834cced87 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/config.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/config.h
@@ -139,7 +139,7 @@
  *
  * System has time.h, time(), and an implementation for
  * mbedtls_platform_gmtime_r() (see below).
- * The time needs to be correct (not necesarily very accurate, but at least
+ * The time needs to be correct (not necessarily very accurate, but at least
  * the date should be correct). This is used to verify the validity period of
  * X.509 certificates.
  *
@@ -276,28 +276,52 @@
  * For example, when a function accepts as input a pointer to a buffer that may
  * contain untrusted data, and its documentation mentions that this pointer
  * must not be NULL:
- * - the pointer is checked to be non-NULL only if this option is enabled
- * - the content of the buffer is always validated
+ * - The pointer is checked to be non-NULL only if this option is enabled.
+ * - The content of the buffer is always validated.
  *
  * When this flag is defined, if a library function receives a parameter that
- * is invalid, it will:
- * - invoke the macro MBEDTLS_PARAM_FAILED() which by default expands to a
- *   call to the function mbedtls_param_failed()
- * - immediately return (with a specific error code unless the function
- *   returns void and can't communicate an error).
+ * is invalid:
+ * 1. The function will invoke the macro MBEDTLS_PARAM_FAILED().
+ * 2. If MBEDTLS_PARAM_FAILED() did not terminate the program, the function
+ *   will immediately return. If the function returns an Mbed TLS error code,
+ *   the error code in this case is MBEDTLS_ERR_xxx_BAD_INPUT_DATA.
  *
- * When defining this flag, you also need to:
- * - either provide a definition of the function mbedtls_param_failed() in
- *   your application (see platform_util.h for its prototype) as the library
- *   calls that function, but does not provide a default definition for it,
- * - or provide a different definition of the macro MBEDTLS_PARAM_FAILED()
- *   below if the above mechanism is not flexible enough to suit your needs.
- *   See the documentation of this macro later in this file.
+ * When defining this flag, you also need to arrange a definition for
+ * MBEDTLS_PARAM_FAILED(). You can do this by any of the following methods:
+ * - By default, the library defines MBEDTLS_PARAM_FAILED() to call a
+ *   function mbedtls_param_failed(), but the library does not define this
+ *   function. If you do not make any other arrangements, you must provide
+ *   the function mbedtls_param_failed() in your application.
+ *   See `platform_util.h` for its prototype.
+ * - If you enable the macro #MBEDTLS_CHECK_PARAMS_ASSERT, then the
+ *   library defines #MBEDTLS_PARAM_FAILED(\c cond) to be `assert(cond)`.
+ *   You can still supply an alternative definition of
+ *   MBEDTLS_PARAM_FAILED(), which may call `assert`.
+ * - If you define a macro MBEDTLS_PARAM_FAILED() before including `config.h`
+ *   or you uncomment the definition of MBEDTLS_PARAM_FAILED() in `config.h`,
+ *   the library will call the macro that you defined and will not supply
+ *   its own version. Note that if MBEDTLS_PARAM_FAILED() calls `assert`,
+ *   you need to enable #MBEDTLS_CHECK_PARAMS_ASSERT so that library source
+ *   files include `<assert.h>`.
  *
  * Uncomment to enable validation of application-controlled parameters.
  */
 //#define MBEDTLS_CHECK_PARAMS
 
+/**
+ * \def MBEDTLS_CHECK_PARAMS_ASSERT
+ *
+ * Allow MBEDTLS_PARAM_FAILED() to call `assert`, and make it default to
+ * `assert`. This macro is only used if #MBEDTLS_CHECK_PARAMS is defined.
+ *
+ * If this macro is not defined, then MBEDTLS_PARAM_FAILED() defaults to
+ * calling a function mbedtls_param_failed(). See the documentation of
+ * #MBEDTLS_CHECK_PARAMS for details.
+ *
+ * Uncomment to allow MBEDTLS_PARAM_FAILED() to call `assert`.
+ */
+//#define MBEDTLS_CHECK_PARAMS_ASSERT
+
 /* \} name SECTION: System support */
 
 /**
@@ -401,7 +425,7 @@
  * \note Because of a signature change, the core AES encryption and decryption routines are
  *       currently named mbedtls_aes_internal_encrypt and mbedtls_aes_internal_decrypt,
  *       respectively. When setting up alternative implementations, these functions should
- *       be overriden, but the wrapper functions mbedtls_aes_decrypt and mbedtls_aes_encrypt
+ *       be overridden, but the wrapper functions mbedtls_aes_decrypt and mbedtls_aes_encrypt
  *       must stay untouched.
  *
  * \note If you use the AES_xxx_ALT macros, then is is recommended to also set
@@ -416,6 +440,16 @@
  *            dependencies on them, and considering stronger message digests
  *            and ciphers instead.
  *
+ * \warning   If both MBEDTLS_ECDSA_SIGN_ALT and MBEDTLS_ECDSA_DETERMINISTIC are
+ *            enabled, then the deterministic ECDH signature functions pass the
+ *            the static HMAC-DRBG as RNG to mbedtls_ecdsa_sign(). Therefore
+ *            alternative implementations should use the RNG only for generating
+ *            the ephemeral key and nothing else. If this is not possible, then
+ *            MBEDTLS_ECDSA_DETERMINISTIC should be disabled and an alternative
+ *            implementation should be provided for mbedtls_ecdsa_sign_det_ext()
+ *            (and for mbedtls_ecdsa_sign_det() too if backward compatibility is
+ *            desirable).
+ *
  */
 //#define MBEDTLS_MD2_PROCESS_ALT
 //#define MBEDTLS_MD4_PROCESS_ALT
@@ -655,6 +689,13 @@
 #define MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN
 #define MBEDTLS_CIPHER_PADDING_ZEROS
 
+/** \def MBEDTLS_CTR_DRBG_USE_128_BIT_KEY
+ *
+ * Uncomment this macro to use a 128-bit key in the CTR_DRBG module.
+ * By default, CTR_DRBG uses a 256-bit key.
+ */
+//#define MBEDTLS_CTR_DRBG_USE_128_BIT_KEY
+
 /**
  * \def MBEDTLS_ENABLE_WEAK_CIPHERSUITES
  *
@@ -1558,7 +1599,7 @@
  * \def MBEDTLS_SSL_SESSION_TICKETS
  *
  * Enable support for RFC 5077 session tickets in SSL.
- * Client-side, provides full support for session tickets (maintainance of a
+ * Client-side, provides full support for session tickets (maintenance of a
  * session store remains the responsibility of the application, though).
  * Server-side, you also need to provide callbacks for writing and parsing
  * tickets, including authenticated encryption and key management. Example
@@ -1724,7 +1765,7 @@
  *
  * \warning TLS-level compression MAY REDUCE SECURITY! See for example the
  * CRIME attack. Before enabling this option, you should examine with care if
- * CRIME or similar exploits may be a applicable to your use case.
+ * CRIME or similar exploits may be applicable to your use case.
  *
  * \note Currently compression can't be used with DTLS.
  *
@@ -2115,7 +2156,11 @@
  *
  * Enable the CTR_DRBG AES-based random generator.
  * The CTR_DRBG generator uses AES-256 by default.
- * To use AES-128 instead, enable MBEDTLS_CTR_DRBG_USE_128_BIT_KEY below.
+ * To use AES-128 instead, enable \c MBEDTLS_CTR_DRBG_USE_128_BIT_KEY above.
+ *
+ * \note To achieve a 256-bit security strength with CTR_DRBG,
+ *       you must use AES-256 *and* use sufficient entropy.
+ *       See ctr_drbg.h for more details.
  *
  * Module:  library/ctr_drbg.c
  * Caller:
@@ -3007,7 +3052,6 @@
 //#define MBEDTLS_CTR_DRBG_MAX_INPUT                256 /**< Maximum number of additional input bytes */
 //#define MBEDTLS_CTR_DRBG_MAX_REQUEST             1024 /**< Maximum number of requested bytes per call */
 //#define MBEDTLS_CTR_DRBG_MAX_SEED_INPUT           384 /**< Maximum size of (re)seed buffer */
-//#define MBEDTLS_CTR_DRBG_USE_128_BIT_KEY              /**< Use 128-bit key for CTR_DRBG - may reduce security (see ctr_drbg.h) */
 
 /* HMAC_DRBG options */
 //#define MBEDTLS_HMAC_DRBG_RESEED_INTERVAL   10000 /**< Interval before reseed is performed by default */
@@ -3036,7 +3080,7 @@
 //#define MBEDTLS_PLATFORM_STD_TIME            time /**< Default time to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */
 //#define MBEDTLS_PLATFORM_STD_FPRINTF      fprintf /**< Default fprintf to use, can be undefined */
 //#define MBEDTLS_PLATFORM_STD_PRINTF        printf /**< Default printf to use, can be undefined */
-/* Note: your snprintf must correclty zero-terminate the buffer! */
+/* Note: your snprintf must correctly zero-terminate the buffer! */
 //#define MBEDTLS_PLATFORM_STD_SNPRINTF    snprintf /**< Default snprintf to use, can be undefined */
 //#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS       0 /**< Default exit value to use, can be undefined */
 //#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE       1 /**< Default exit value to use, can be undefined */
@@ -3053,20 +3097,23 @@
 //#define MBEDTLS_PLATFORM_TIME_TYPE_MACRO       time_t /**< Default time macro to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */
 //#define MBEDTLS_PLATFORM_FPRINTF_MACRO      fprintf /**< Default fprintf macro to use, can be undefined */
 //#define MBEDTLS_PLATFORM_PRINTF_MACRO        printf /**< Default printf macro to use, can be undefined */
-/* Note: your snprintf must correclty zero-terminate the buffer! */
+/* Note: your snprintf must correctly zero-terminate the buffer! */
 //#define MBEDTLS_PLATFORM_SNPRINTF_MACRO    snprintf /**< Default snprintf macro to use, can be undefined */
 //#define MBEDTLS_PLATFORM_NV_SEED_READ_MACRO   mbedtls_platform_std_nv_seed_read /**< Default nv_seed_read function to use, can be undefined */
 //#define MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO  mbedtls_platform_std_nv_seed_write /**< Default nv_seed_write function to use, can be undefined */
 
 /**
  * \brief       This macro is invoked by the library when an invalid parameter
- *              is detected that is only checked with MBEDTLS_CHECK_PARAMS
+ *              is detected that is only checked with #MBEDTLS_CHECK_PARAMS
  *              (see the documentation of that option for context).
  *
- *              When you leave this undefined here, a default definition is
- *              provided that invokes the function mbedtls_param_failed(),
- *              which is declared in platform_util.h for the benefit of the
- *              library, but that you need to define in your application.
+ *              When you leave this undefined here, the library provides
+ *              a default definition. If the macro #MBEDTLS_CHECK_PARAMS_ASSERT
+ *              is defined, the default definition is `assert(cond)`,
+ *              otherwise the default definition calls a function
+ *              mbedtls_param_failed(). This function is declared in
+ *              `platform_util.h` for the benefit of the library, but
+ *              you need to define in your application.
  *
  *              When you define this here, this replaces the default
  *              definition in platform_util.h (which no longer declares the
@@ -3075,6 +3122,9 @@
  *              particular, that all the necessary declarations are visible
  *              from within the library - you can ensure that by providing
  *              them in this file next to the macro definition).
+ *              If you define this macro to call `assert`, also define
+ *              #MBEDTLS_CHECK_PARAMS_ASSERT so that library source files
+ *              include `<assert.h>`.
  *
  *              Note that you may define this macro to expand to nothing, in
  *              which case you don't have to worry about declarations or
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ctr_drbg.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ctr_drbg.h
index cc3df7b11..e0b5ed9c9 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ctr_drbg.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ctr_drbg.h
@@ -1,7 +1,8 @@
 /**
  * \file ctr_drbg.h
  *
- * \brief    This file contains CTR_DRBG definitions and functions.
+ * \brief    This file contains definitions and functions for the
+ *           CTR_DRBG pseudorandom generator.
  *
  * CTR_DRBG is a standardized way of building a PRNG from a block-cipher
  * in counter mode operation, as defined in <em>NIST SP 800-90A:
@@ -9,13 +10,35 @@
  * Bit Generators</em>.
  *
  * The Mbed TLS implementation of CTR_DRBG uses AES-256 (default) or AES-128
- * as the underlying block cipher.
+ * (if \c MBEDTLS_CTR_DRBG_USE_128_BIT_KEY is enabled at compile time)
+ * as the underlying block cipher, with a derivation function.
+ * The initial seeding grabs #MBEDTLS_CTR_DRBG_ENTROPY_LEN bytes of entropy.
+ * See the documentation of mbedtls_ctr_drbg_seed() for more details.
  *
- *  \warning Using 128-bit keys for CTR_DRBG limits the security of generated
- *  keys and operations that use random values generated to 128-bit security.
+ * Based on NIST SP 800-90A §10.2.1 table 3 and NIST SP 800-57 part 1 table 2,
+ * here are the security strengths achieved in typical configuration:
+ * - 256 bits under the default configuration of the library, with AES-256
+ *   and with #MBEDTLS_CTR_DRBG_ENTROPY_LEN set to 48 or more.
+ * - 256 bits if AES-256 is used, #MBEDTLS_CTR_DRBG_ENTROPY_LEN is set
+ *   to 32 or more, and the DRBG is initialized with an explicit
+ *   nonce in the \c custom parameter to mbedtls_ctr_drbg_seed().
+ * - 128 bits if AES-256 is used but #MBEDTLS_CTR_DRBG_ENTROPY_LEN is
+ *   between 24 and 47 and the DRBG is not initialized with an explicit
+ *   nonce (see mbedtls_ctr_drbg_seed()).
+ * - 128 bits if AES-128 is used (\c MBEDTLS_CTR_DRBG_USE_128_BIT_KEY enabled)
+ *   and #MBEDTLS_CTR_DRBG_ENTROPY_LEN is set to 24 or more (which is
+ *   always the case unless it is explicitly set to a different value
+ *   in config.h).
+ *
+ * Note that the value of #MBEDTLS_CTR_DRBG_ENTROPY_LEN defaults to:
+ * - \c 48 if the module \c MBEDTLS_SHA512_C is enabled and the symbol
+ *   \c MBEDTLS_ENTROPY_FORCE_SHA256 is disabled at compile time.
+ *   This is the default configuration of the library.
+ * - \c 32 if the module \c MBEDTLS_SHA512_C is disabled at compile time.
+ * - \c 32 if \c MBEDTLS_ENTROPY_FORCE_SHA256 is enabled at compile time.
  */
 /*
- *  Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
+ *  Copyright (C) 2006-2019, Arm Limited (or its affiliates), All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -56,9 +79,19 @@
 #define MBEDTLS_CTR_DRBG_BLOCKSIZE          16 /**< The block size used by the cipher. */
 
 #if defined(MBEDTLS_CTR_DRBG_USE_128_BIT_KEY)
-#define MBEDTLS_CTR_DRBG_KEYSIZE            16 /**< The key size used by the cipher (compile-time choice: 128 bits). */
+#define MBEDTLS_CTR_DRBG_KEYSIZE            16
+/**< The key size in bytes used by the cipher.
+ *
+ * Compile-time choice: 16 bytes (128 bits)
+ * because #MBEDTLS_CTR_DRBG_USE_128_BIT_KEY is enabled.
+ */
 #else
-#define MBEDTLS_CTR_DRBG_KEYSIZE            32 /**< The key size used by the cipher (compile-time choice: 256 bits). */
+#define MBEDTLS_CTR_DRBG_KEYSIZE            32
+/**< The key size in bytes used by the cipher.
+ *
+ * Compile-time choice: 32 bytes (256 bits)
+ * because \c MBEDTLS_CTR_DRBG_USE_128_BIT_KEY is disabled.
+ */
 #endif
 
 #define MBEDTLS_CTR_DRBG_KEYBITS            ( MBEDTLS_CTR_DRBG_KEYSIZE * 8 ) /**< The key size for the DRBG operation, in bits. */
@@ -73,21 +106,31 @@
  * \{
  */
 
+/** \def MBEDTLS_CTR_DRBG_ENTROPY_LEN
+ *
+ * \brief The amount of entropy used per seed by default, in bytes.
+ */
 #if !defined(MBEDTLS_CTR_DRBG_ENTROPY_LEN)
 #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
+/** This is 48 bytes because the entropy module uses SHA-512
+ * (\c MBEDTLS_ENTROPY_FORCE_SHA256 is disabled).
+ */
 #define MBEDTLS_CTR_DRBG_ENTROPY_LEN        48
-/**< The amount of entropy used per seed by default:
- * <ul><li>48 with SHA-512.</li>
- * <li>32 with SHA-256.</li></ul>
+
+#else /* defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256) */
+
+/** This is 32 bytes because the entropy module uses SHA-256
+ * (the SHA512 module is disabled or
+ * \c MBEDTLS_ENTROPY_FORCE_SHA256 is enabled).
  */
-#else
+#if !defined(MBEDTLS_CTR_DRBG_USE_128_BIT_KEY)
+/** \warning To achieve a 256-bit security strength, you must pass a nonce
+ *           to mbedtls_ctr_drbg_seed().
+ */
+#endif /* !defined(MBEDTLS_CTR_DRBG_USE_128_BIT_KEY) */
 #define MBEDTLS_CTR_DRBG_ENTROPY_LEN        32
-/**< Amount of entropy used per seed by default:
- * <ul><li>48 with SHA-512.</li>
- * <li>32 with SHA-256.</li></ul>
- */
-#endif
-#endif
+#endif /* defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256) */
+#endif /* !defined(MBEDTLS_CTR_DRBG_ENTROPY_LEN) */
 
 #if !defined(MBEDTLS_CTR_DRBG_RESEED_INTERVAL)
 #define MBEDTLS_CTR_DRBG_RESEED_INTERVAL    10000
@@ -106,7 +149,7 @@
 
 #if !defined(MBEDTLS_CTR_DRBG_MAX_SEED_INPUT)
 #define MBEDTLS_CTR_DRBG_MAX_SEED_INPUT     384
-/**< The maximum size of seed or reseed buffer. */
+/**< The maximum size of seed or reseed buffer in bytes. */
 #endif
 
 /* \} name SECTION: Module settings */
@@ -164,17 +207,68 @@ void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx );
  * \brief               This function seeds and sets up the CTR_DRBG
  *                      entropy source for future reseeds.
  *
- * \note Personalization data can be provided in addition to the more generic
- *       entropy source, to make this instantiation as unique as possible.
+ * A typical choice for the \p f_entropy and \p p_entropy parameters is
+ * to use the entropy module:
+ * - \p f_entropy is mbedtls_entropy_func();
+ * - \p p_entropy is an instance of ::mbedtls_entropy_context initialized
+ *   with mbedtls_entropy_init() (which registers the platform's default
+ *   entropy sources).
  *
+ * The entropy length is #MBEDTLS_CTR_DRBG_ENTROPY_LEN by default.
+ * You can override it by calling mbedtls_ctr_drbg_set_entropy_len().
+ *
+ * You can provide a personalization string in addition to the
+ * entropy source, to make this instantiation as unique as possible.
+ *
+ * \note                The _seed_material_ value passed to the derivation
+ *                      function in the CTR_DRBG Instantiate Process
+ *                      described in NIST SP 800-90A §10.2.1.3.2
+ *                      is the concatenation of the string obtained from
+ *                      calling \p f_entropy and the \p custom string.
+ *                      The origin of the nonce depends on the value of
+ *                      the entropy length relative to the security strength.
+ *                      - If the entropy length is at least 1.5 times the
+ *                        security strength then the nonce is taken from the
+ *                        string obtained with \p f_entropy.
+ *                      - If the entropy length is less than the security
+ *                        strength, then the nonce is taken from \p custom.
+ *                        In this case, for compliance with SP 800-90A,
+ *                        you must pass a unique value of \p custom at
+ *                        each invocation. See SP 800-90A §8.6.7 for more
+ *                        details.
+ */
+#if MBEDTLS_CTR_DRBG_ENTROPY_LEN < MBEDTLS_CTR_DRBG_KEYSIZE * 3 / 2
+/** \warning            When #MBEDTLS_CTR_DRBG_ENTROPY_LEN is less than
+ *                      #MBEDTLS_CTR_DRBG_KEYSIZE * 3 / 2, to achieve the
+ *                      maximum security strength permitted by CTR_DRBG,
+ *                      you must pass a value of \p custom that is a nonce:
+ *                      this value must never be repeated in subsequent
+ *                      runs of the same application or on a different
+ *                      device.
+ */
+#endif
+/**
  * \param ctx           The CTR_DRBG context to seed.
+ *                      It must have been initialized with
+ *                      mbedtls_ctr_drbg_init().
+ *                      After a successful call to mbedtls_ctr_drbg_seed(),
+ *                      you may not call mbedtls_ctr_drbg_seed() again on
+ *                      the same context unless you call
+ *                      mbedtls_ctr_drbg_free() and mbedtls_ctr_drbg_init()
+ *                      again first.
  * \param f_entropy     The entropy callback, taking as arguments the
  *                      \p p_entropy context, the buffer to fill, and the
-                        length of the buffer.
- * \param p_entropy     The entropy context.
- * \param custom        Personalization data, that is device-specific
-                        identifiers. Can be NULL.
- * \param len           The length of the personalization data.
+ *                      length of the buffer.
+ *                      \p f_entropy is always called with a buffer size
+ *                      equal to the entropy length.
+ * \param p_entropy     The entropy context to pass to \p f_entropy.
+ * \param custom        The personalization string.
+ *                      This can be \c NULL, in which case the personalization
+ *                      string is empty regardless of the value of \p len.
+ * \param len           The length of the personalization string.
+ *                      This must be at most
+ *                      #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT
+ *                      - #MBEDTLS_CTR_DRBG_ENTROPY_LEN.
  *
  * \return              \c 0 on success.
  * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure.
@@ -197,7 +291,8 @@ void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx );
  *                      The default value is off.
  *
  * \note                If enabled, entropy is gathered at the beginning of
- *                      every call to mbedtls_ctr_drbg_random_with_add().
+ *                      every call to mbedtls_ctr_drbg_random_with_add()
+ *                      or mbedtls_ctr_drbg_random().
  *                      Only use this if your entropy source has sufficient
  *                      throughput.
  *
@@ -209,18 +304,37 @@ void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx,
 
 /**
  * \brief               This function sets the amount of entropy grabbed on each
- *                      seed or reseed. The default value is
- *                      #MBEDTLS_CTR_DRBG_ENTROPY_LEN.
+ *                      seed or reseed.
+ *
+ * The default value is #MBEDTLS_CTR_DRBG_ENTROPY_LEN.
+ *
+ * \note                The security strength of CTR_DRBG is bounded by the
+ *                      entropy length. Thus:
+ *                      - When using AES-256
+ *                        (\c MBEDTLS_CTR_DRBG_USE_128_BIT_KEY is disabled,
+ *                        which is the default),
+ *                        \p len must be at least 32 (in bytes)
+ *                        to achieve a 256-bit strength.
+ *                      - When using AES-128
+ *                        (\c MBEDTLS_CTR_DRBG_USE_128_BIT_KEY is enabled)
+ *                        \p len must be at least 16 (in bytes)
+ *                        to achieve a 128-bit strength.
  *
  * \param ctx           The CTR_DRBG context.
- * \param len           The amount of entropy to grab.
+ * \param len           The amount of entropy to grab, in bytes.
+ *                      This must be at most #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT.
  */
 void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx,
                                size_t len );
 
 /**
  * \brief               This function sets the reseed interval.
- *                      The default value is #MBEDTLS_CTR_DRBG_RESEED_INTERVAL.
+ *
+ * The reseed interval is the number of calls to mbedtls_ctr_drbg_random()
+ * or mbedtls_ctr_drbg_random_with_add() after which the entropy function
+ * is called again.
+ *
+ * The default value is #MBEDTLS_CTR_DRBG_RESEED_INTERVAL.
  *
  * \param ctx           The CTR_DRBG context.
  * \param interval      The reseed interval.
@@ -233,8 +347,12 @@ void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx,
  *                      extracts data from the entropy source.
  *
  * \param ctx           The CTR_DRBG context.
- * \param additional    Additional data to add to the state. Can be NULL.
+ * \param additional    Additional data to add to the state. Can be \c NULL.
  * \param len           The length of the additional data.
+ *                      This must be less than
+ *                      #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT - \c entropy_len
+ *                      where \c entropy_len is the entropy length
+ *                      configured for the context.
  *
  * \return              \c 0 on success.
  * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure.
@@ -246,7 +364,8 @@ int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
  * \brief              This function updates the state of the CTR_DRBG context.
  *
  * \param ctx          The CTR_DRBG context.
- * \param additional   The data to update the state with.
+ * \param additional   The data to update the state with. This must not be
+ *                     \c NULL unless \p add_len is \c 0.
  * \param add_len      Length of \p additional in bytes. This must be at
  *                     most #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT.
  *
@@ -264,14 +383,23 @@ int mbedtls_ctr_drbg_update_ret( mbedtls_ctr_drbg_context *ctx,
  * \brief   This function updates a CTR_DRBG instance with additional
  *          data and uses it to generate random data.
  *
- * \note    The function automatically reseeds if the reseed counter is exceeded.
+ * This function automatically reseeds if the reseed counter is exceeded
+ * or prediction resistance is enabled.
  *
  * \param p_rng         The CTR_DRBG context. This must be a pointer to a
  *                      #mbedtls_ctr_drbg_context structure.
  * \param output        The buffer to fill.
- * \param output_len    The length of the buffer.
- * \param additional    Additional data to update. Can be NULL.
- * \param add_len       The length of the additional data.
+ * \param output_len    The length of the buffer in bytes.
+ * \param additional    Additional data to update. Can be \c NULL, in which
+ *                      case the additional data is empty regardless of
+ *                      the value of \p add_len.
+ * \param add_len       The length of the additional data
+ *                      if \p additional is not \c NULL.
+ *                      This must be less than #MBEDTLS_CTR_DRBG_MAX_INPUT
+ *                      and less than
+ *                      #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT - \c entropy_len
+ *                      where \c entropy_len is the entropy length
+ *                      configured for the context.
  *
  * \return    \c 0 on success.
  * \return    #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
@@ -284,12 +412,14 @@ int mbedtls_ctr_drbg_random_with_add( void *p_rng,
 /**
  * \brief   This function uses CTR_DRBG to generate random data.
  *
- * \note    The function automatically reseeds if the reseed counter is exceeded.
+ * This function automatically reseeds if the reseed counter is exceeded
+ * or prediction resistance is enabled.
+ *
  *
  * \param p_rng         The CTR_DRBG context. This must be a pointer to a
  *                      #mbedtls_ctr_drbg_context structure.
  * \param output        The buffer to fill.
- * \param output_len    The length of the buffer.
+ * \param output_len    The length of the buffer in bytes.
  *
  * \return              \c 0 on success.
  * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
@@ -336,7 +466,7 @@ MBEDTLS_DEPRECATED void mbedtls_ctr_drbg_update(
  *
  * \return              \c 0 on success.
  * \return              #MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR on file error.
- * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on
+ * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on reseed
  *                      failure.
  */
 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
@@ -350,8 +480,10 @@ int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char
  *
  * \return              \c 0 on success.
  * \return              #MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR on file error.
- * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
- *                      #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG on failure.
+ * \return              #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on
+ *                      reseed failure.
+ * \return              #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG if the existing
+ *                      seed file is too large.
  */
 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
 #endif /* MBEDTLS_FS_IO */
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ecdsa.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ecdsa.h
index f8b28507c..932acc6d1 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ecdsa.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ecdsa.h
@@ -175,6 +175,19 @@ int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
  *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
  *                  4.1.3, step 5.
  *
+ * \warning         Since the output of the internal RNG is always the same for
+ *                  the same key and message, this limits the efficiency of
+ *                  blinding and leaks information through side channels. For
+ *                  secure behavior use mbedtls_ecdsa_sign_det_ext() instead.
+ *
+ *                  (Optimally the blinding is a random value that is different
+ *                  on every execution. In this case the blinding is still
+ *                  random from the attackers perspective, but is the same on
+ *                  each execution. This means that this blinding does not
+ *                  prevent attackers from recovering secrets by combining
+ *                  several measurement traces, but may prevent some attacks
+ *                  that exploit relationships between secret data.)
+ *
  * \see             ecp.h
  *
  * \param grp       The context for the elliptic curve to use.
@@ -200,6 +213,52 @@ int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r,
                             mbedtls_mpi *s, const mbedtls_mpi *d,
                             const unsigned char *buf, size_t blen,
                             mbedtls_md_type_t md_alg );
+/**
+ * \brief           This function computes the ECDSA signature of a
+ *                  previously-hashed message, deterministic version.
+ *
+ *                  For more information, see <em>RFC-6979: Deterministic
+ *                  Usage of the Digital Signature Algorithm (DSA) and Elliptic
+ *                  Curve Digital Signature Algorithm (ECDSA)</em>.
+ *
+ * \note            If the bitlength of the message hash is larger than the
+ *                  bitlength of the group order, then the hash is truncated as
+ *                  defined in <em>Standards for Efficient Cryptography Group
+ *                  (SECG): SEC1 Elliptic Curve Cryptography</em>, section
+ *                  4.1.3, step 5.
+ *
+ * \see             ecp.h
+ *
+ * \param grp           The context for the elliptic curve to use.
+ *                      This must be initialized and have group parameters
+ *                      set, for example through mbedtls_ecp_group_load().
+ * \param r             The MPI context in which to store the first part
+ *                      the signature. This must be initialized.
+ * \param s             The MPI context in which to store the second part
+ *                      the signature. This must be initialized.
+ * \param d             The private signing key. This must be initialized
+ *                      and setup, for example through mbedtls_ecp_gen_privkey().
+ * \param buf           The hashed content to be signed. This must be a readable
+ *                      buffer of length \p blen Bytes. It may be \c NULL if
+ *                      \p blen is zero.
+ * \param blen          The length of \p buf in Bytes.
+ * \param md_alg        The hash algorithm used to hash the original data.
+ * \param f_rng_blind   The RNG function used for blinding. This must not be
+ *                      \c NULL.
+ * \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be
+ *                      \c NULL if \p f_rng doesn't need a context parameter.
+ *
+ * \return          \c 0 on success.
+ * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
+ *                  error code on failure.
+ */
+int mbedtls_ecdsa_sign_det_ext( mbedtls_ecp_group *grp, mbedtls_mpi *r,
+                                mbedtls_mpi *s, const mbedtls_mpi *d,
+                                const unsigned char *buf, size_t blen,
+                                mbedtls_md_type_t md_alg,
+                                int (*f_rng_blind)(void *, unsigned char *,
+                                                   size_t),
+                                void *p_rng_blind );
 #endif /* MBEDTLS_ECDSA_DETERMINISTIC */
 
 /**
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hkdf.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hkdf.h
index 40ee64eb0..bcafe4251 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hkdf.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hkdf.h
@@ -7,22 +7,22 @@
  *          specified by RFC 5869.
  */
 /*
- * Copyright (C) 2016-2018, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: Apache-2.0
+ *  Copyright (C) 2016-2019, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
  *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
  *
- * http://www.apache.org/licenses/LICENSE-2.0
+ *  http://www.apache.org/licenses/LICENSE-2.0
  *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
  *
- * This file is part of mbed TLS (https://tls.mbed.org)
+ *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 #ifndef MBEDTLS_HKDF_H
 #define MBEDTLS_HKDF_H
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hmac_drbg.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hmac_drbg.h
index 7eae32bbd..7931c2281 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hmac_drbg.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/hmac_drbg.h
@@ -1,10 +1,14 @@
 /**
  * \file hmac_drbg.h
  *
- * \brief HMAC_DRBG (NIST SP 800-90A)
+ * \brief The HMAC_DRBG pseudorandom generator.
+ *
+ * This module implements the HMAC_DRBG pseudorandom generator described
+ * in <em>NIST SP 800-90A: Recommendation for Random Number Generation Using
+ * Deterministic Random Bit Generators</em>.
  */
 /*
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  Copyright (C) 2006-2019, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -82,7 +86,7 @@ extern "C" {
  */
 typedef struct mbedtls_hmac_drbg_context
 {
-    /* Working state: the key K is not stored explicitely,
+    /* Working state: the key K is not stored explicitly,
      * but is implied by the HMAC context */
     mbedtls_md_context_t md_ctx;                    /*!< HMAC context (inc. K)  */
     unsigned char V[MBEDTLS_MD_MAX_SIZE];  /*!< V in the spec          */
@@ -104,38 +108,72 @@ typedef struct mbedtls_hmac_drbg_context
 } mbedtls_hmac_drbg_context;
 
 /**
- * \brief               HMAC_DRBG context initialization
- *                      Makes the context ready for mbedtls_hmac_drbg_seed(),
- *                      mbedtls_hmac_drbg_seed_buf() or
- *                      mbedtls_hmac_drbg_free().
+ * \brief               HMAC_DRBG context initialization.
  *
- * \param ctx           HMAC_DRBG context to be initialized
+ * This function makes the context ready for mbedtls_hmac_drbg_seed(),
+ * mbedtls_hmac_drbg_seed_buf() or mbedtls_hmac_drbg_free().
+ *
+ * \param ctx           HMAC_DRBG context to be initialized.
  */
 void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx );
 
 /**
- * \brief               HMAC_DRBG initial seeding
- *                      Seed and setup entropy source for future reseeds.
+ * \brief               HMAC_DRBG initial seeding.
  *
- * \param ctx           HMAC_DRBG context to be seeded
- * \param md_info       MD algorithm to use for HMAC_DRBG
- * \param f_entropy     Entropy callback (p_entropy, buffer to fill, buffer
- *                      length)
- * \param p_entropy     Entropy context
- * \param custom        Personalization data (Device specific identifiers)
- *                      (Can be NULL)
- * \param len           Length of personalization data
+ * Set the initial seed and set up the entropy source for future reseeds.
  *
- * \note                The "security strength" as defined by NIST is set to:
- *                      128 bits if md_alg is SHA-1,
- *                      192 bits if md_alg is SHA-224,
- *                      256 bits if md_alg is SHA-256 or higher.
+ * A typical choice for the \p f_entropy and \p p_entropy parameters is
+ * to use the entropy module:
+ * - \p f_entropy is mbedtls_entropy_func();
+ * - \p p_entropy is an instance of ::mbedtls_entropy_context initialized
+ *   with mbedtls_entropy_init() (which registers the platform's default
+ *   entropy sources).
+ *
+ * You can provide a personalization string in addition to the
+ * entropy source, to make this instantiation as unique as possible.
+ *
+ * \note                By default, the security strength as defined by NIST is:
+ *                      - 128 bits if \p md_info is SHA-1;
+ *                      - 192 bits if \p md_info is SHA-224;
+ *                      - 256 bits if \p md_info is SHA-256, SHA-384 or SHA-512.
  *                      Note that SHA-256 is just as efficient as SHA-224.
+ *                      The security strength can be reduced if a smaller
+ *                      entropy length is set with
+ *                      mbedtls_hmac_drbg_set_entropy_len().
  *
- * \return              0 if successful, or
- *                      MBEDTLS_ERR_MD_BAD_INPUT_DATA, or
- *                      MBEDTLS_ERR_MD_ALLOC_FAILED, or
- *                      MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED.
+ * \note                The default entropy length is the security strength
+ *                      (converted from bits to bytes). You can override
+ *                      it by calling mbedtls_hmac_drbg_set_entropy_len().
+ *
+ * \note                During the initial seeding, this function calls
+ *                      the entropy source to obtain a nonce
+ *                      whose length is half the entropy length.
+ *
+ * \param ctx           HMAC_DRBG context to be seeded.
+ * \param md_info       MD algorithm to use for HMAC_DRBG.
+ * \param f_entropy     The entropy callback, taking as arguments the
+ *                      \p p_entropy context, the buffer to fill, and the
+ *                      length of the buffer.
+ *                      \p f_entropy is always called with a length that is
+ *                      less than or equal to the entropy length.
+ * \param p_entropy     The entropy context to pass to \p f_entropy.
+ * \param custom        The personalization string.
+ *                      This can be \c NULL, in which case the personalization
+ *                      string is empty regardless of the value of \p len.
+ * \param len           The length of the personalization string.
+ *                      This must be at most #MBEDTLS_HMAC_DRBG_MAX_INPUT
+ *                      and also at most
+ *                      #MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT - \p entropy_len * 3 / 2
+ *                      where \p entropy_len is the entropy length
+ *                      described above.
+ *
+ * \return              \c 0 if successful.
+ * \return              #MBEDTLS_ERR_MD_BAD_INPUT_DATA if \p md_info is
+ *                      invalid.
+ * \return              #MBEDTLS_ERR_MD_ALLOC_FAILED if there was not enough
+ *                      memory to allocate context data.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
+ *                      if the call to \p f_entropy failed.
  */
 int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
                     const mbedtls_md_info_t * md_info,
@@ -146,98 +184,131 @@ int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
 
 /**
  * \brief               Initilisation of simpified HMAC_DRBG (never reseeds).
- *                      (For use with deterministic ECDSA.)
  *
- * \param ctx           HMAC_DRBG context to be initialised
- * \param md_info       MD algorithm to use for HMAC_DRBG
- * \param data          Concatenation of entropy string and additional data
- * \param data_len      Length of data in bytes
+ * This function is meant for use in algorithms that need a pseudorandom
+ * input such as deterministic ECDSA.
  *
- * \return              0 if successful, or
- *                      MBEDTLS_ERR_MD_BAD_INPUT_DATA, or
- *                      MBEDTLS_ERR_MD_ALLOC_FAILED.
+ * \param ctx           HMAC_DRBG context to be initialised.
+ * \param md_info       MD algorithm to use for HMAC_DRBG.
+ * \param data          Concatenation of the initial entropy string and
+ *                      the additional data.
+ * \param data_len      Length of \p data in bytes.
+ *
+ * \return              \c 0 if successful. or
+ * \return              #MBEDTLS_ERR_MD_BAD_INPUT_DATA if \p md_info is
+ *                      invalid.
+ * \return              #MBEDTLS_ERR_MD_ALLOC_FAILED if there was not enough
+ *                      memory to allocate context data.
  */
 int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
                         const mbedtls_md_info_t * md_info,
                         const unsigned char *data, size_t data_len );
 
 /**
- * \brief               Enable / disable prediction resistance (Default: Off)
+ * \brief               This function turns prediction resistance on or off.
+ *                      The default value is off.
  *
- * Note: If enabled, entropy is used for ctx->entropy_len before each call!
- *       Only use this if you have ample supply of good entropy!
+ * \note                If enabled, entropy is gathered at the beginning of
+ *                      every call to mbedtls_hmac_drbg_random_with_add()
+ *                      or mbedtls_hmac_drbg_random().
+ *                      Only use this if your entropy source has sufficient
+ *                      throughput.
  *
- * \param ctx           HMAC_DRBG context
- * \param resistance    MBEDTLS_HMAC_DRBG_PR_ON or MBEDTLS_HMAC_DRBG_PR_OFF
+ * \param ctx           The HMAC_DRBG context.
+ * \param resistance    #MBEDTLS_HMAC_DRBG_PR_ON or #MBEDTLS_HMAC_DRBG_PR_OFF.
  */
 void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
                                           int resistance );
 
 /**
- * \brief               Set the amount of entropy grabbed on each reseed
- *                      (Default: given by the security strength, which
- *                      depends on the hash used, see \c mbedtls_hmac_drbg_init() )
+ * \brief               This function sets the amount of entropy grabbed on each
+ *                      seed or reseed.
  *
- * \param ctx           HMAC_DRBG context
- * \param len           Amount of entropy to grab, in bytes
+ * See the documentation of mbedtls_hmac_drbg_seed() for the default value.
+ *
+ * \param ctx           The HMAC_DRBG context.
+ * \param len           The amount of entropy to grab, in bytes.
  */
 void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx,
                                 size_t len );
 
 /**
- * \brief               Set the reseed interval
- *                      (Default: MBEDTLS_HMAC_DRBG_RESEED_INTERVAL)
+ * \brief               Set the reseed interval.
  *
- * \param ctx           HMAC_DRBG context
- * \param interval      Reseed interval
+ * The reseed interval is the number of calls to mbedtls_hmac_drbg_random()
+ * or mbedtls_hmac_drbg_random_with_add() after which the entropy function
+ * is called again.
+ *
+ * The default value is #MBEDTLS_HMAC_DRBG_RESEED_INTERVAL.
+ *
+ * \param ctx           The HMAC_DRBG context.
+ * \param interval      The reseed interval.
  */
 void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx,
                                     int interval );
 
 /**
- * \brief               HMAC_DRBG update state
+ * \brief               This function updates the state of the HMAC_DRBG context.
  *
- * \param ctx           HMAC_DRBG context
- * \param additional    Additional data to update state with, or NULL
- * \param add_len       Length of additional data, or 0
+ * \param ctx           The HMAC_DRBG context.
+ * \param additional    The data to update the state with.
+ *                      If this is \c NULL, there is no additional data.
+ * \param add_len       Length of \p additional in bytes.
+ *                      Unused if \p additional is \c NULL.
  *
  * \return              \c 0 on success, or an error from the underlying
  *                      hash calculation.
- *
- * \note                Additional data is optional, pass NULL and 0 as second
- *                      third argument if no additional data is being used.
  */
 int mbedtls_hmac_drbg_update_ret( mbedtls_hmac_drbg_context *ctx,
                        const unsigned char *additional, size_t add_len );
 
 /**
- * \brief               HMAC_DRBG reseeding (extracts data from entropy source)
+ * \brief               This function reseeds the HMAC_DRBG context, that is
+ *                      extracts data from the entropy source.
  *
- * \param ctx           HMAC_DRBG context
- * \param additional    Additional data to add to state (Can be NULL)
- * \param len           Length of additional data
+ * \param ctx           The HMAC_DRBG context.
+ * \param additional    Additional data to add to the state.
+ *                      If this is \c NULL, there is no additional data
+ *                      and \p len should be \c 0.
+ * \param len           The length of the additional data.
+ *                      This must be at most #MBEDTLS_HMAC_DRBG_MAX_INPUT
+ *                      and also at most
+ *                      #MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT - \p entropy_len
+ *                      where \p entropy_len is the entropy length
+ *                      (see mbedtls_hmac_drbg_set_entropy_len()).
  *
- * \return              0 if successful, or
- *                      MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
+ * \return              \c 0 if successful.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
+ *                      if a call to the entropy function failed.
  */
 int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
                       const unsigned char *additional, size_t len );
 
 /**
- * \brief               HMAC_DRBG generate random with additional update input
+ * \brief   This function updates an HMAC_DRBG instance with additional
+ *          data and uses it to generate random data.
  *
- * Note: Automatically reseeds if reseed_counter is reached or PR is enabled.
+ * This function automatically reseeds if the reseed counter is exceeded
+ * or prediction resistance is enabled.
  *
- * \param p_rng         HMAC_DRBG context
- * \param output        Buffer to fill
- * \param output_len    Length of the buffer
- * \param additional    Additional data to update with (can be NULL)
- * \param add_len       Length of additional data (can be 0)
+ * \param p_rng         The HMAC_DRBG context. This must be a pointer to a
+ *                      #mbedtls_hmac_drbg_context structure.
+ * \param output        The buffer to fill.
+ * \param output_len    The length of the buffer in bytes.
+ *                      This must be at most #MBEDTLS_HMAC_DRBG_MAX_REQUEST.
+ * \param additional    Additional data to update with.
+ *                      If this is \c NULL, there is no additional data
+ *                      and \p add_len should be \c 0.
+ * \param add_len       The length of the additional data.
+ *                      This must be at most #MBEDTLS_HMAC_DRBG_MAX_INPUT.
  *
- * \return              0 if successful, or
- *                      MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or
- *                      MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG, or
- *                      MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG.
+ * \return              \c 0 if successful.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
+ *                      if a call to the entropy source failed.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG if
+ *                      \p output_len > #MBEDTLS_HMAC_DRBG_MAX_REQUEST.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG if
+ *                      \p add_len > #MBEDTLS_HMAC_DRBG_MAX_INPUT.
  */
 int mbedtls_hmac_drbg_random_with_add( void *p_rng,
                                unsigned char *output, size_t output_len,
@@ -245,24 +316,29 @@ int mbedtls_hmac_drbg_random_with_add( void *p_rng,
                                size_t add_len );
 
 /**
- * \brief               HMAC_DRBG generate random
+ * \brief   This function uses HMAC_DRBG to generate random data.
  *
- * Note: Automatically reseeds if reseed_counter is reached or PR is enabled.
+ * This function automatically reseeds if the reseed counter is exceeded
+ * or prediction resistance is enabled.
  *
- * \param p_rng         HMAC_DRBG context
- * \param output        Buffer to fill
- * \param out_len       Length of the buffer
+ * \param p_rng         The HMAC_DRBG context. This must be a pointer to a
+ *                      #mbedtls_hmac_drbg_context structure.
+ * \param output        The buffer to fill.
+ * \param out_len       The length of the buffer in bytes.
+ *                      This must be at most #MBEDTLS_HMAC_DRBG_MAX_REQUEST.
  *
- * \return              0 if successful, or
- *                      MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or
- *                      MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG
+ * \return              \c 0 if successful.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
+ *                      if a call to the entropy source failed.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG if
+ *                      \p out_len > #MBEDTLS_HMAC_DRBG_MAX_REQUEST.
  */
 int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len );
 
 /**
  * \brief               Free an HMAC_DRBG context
  *
- * \param ctx           HMAC_DRBG context to free.
+ * \param ctx           The HMAC_DRBG context to free.
  */
 void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx );
 
@@ -273,17 +349,16 @@ void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx );
 #define MBEDTLS_DEPRECATED
 #endif
 /**
- * \brief               HMAC_DRBG update state
+ * \brief               This function updates the state of the HMAC_DRBG context.
  *
  * \deprecated          Superseded by mbedtls_hmac_drbg_update_ret()
  *                      in 2.16.0.
  *
- * \param ctx           HMAC_DRBG context
- * \param additional    Additional data to update state with, or NULL
- * \param add_len       Length of additional data, or 0
- *
- * \note                Additional data is optional, pass NULL and 0 as second
- *                      third argument if no additional data is being used.
+ * \param ctx           The HMAC_DRBG context.
+ * \param additional    The data to update the state with.
+ *                      If this is \c NULL, there is no additional data.
+ * \param add_len       Length of \p additional in bytes.
+ *                      Unused if \p additional is \c NULL.
  */
 MBEDTLS_DEPRECATED void mbedtls_hmac_drbg_update(
     mbedtls_hmac_drbg_context *ctx,
@@ -293,26 +368,31 @@ MBEDTLS_DEPRECATED void mbedtls_hmac_drbg_update(
 
 #if defined(MBEDTLS_FS_IO)
 /**
- * \brief               Write a seed file
+ * \brief               This function writes a seed file.
  *
- * \param ctx           HMAC_DRBG context
- * \param path          Name of the file
+ * \param ctx           The HMAC_DRBG context.
+ * \param path          The name of the file.
  *
- * \return              0 if successful, 1 on file error, or
- *                      MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
+ * \return              \c 0 on success.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR on file error.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED on reseed
+ *                      failure.
  */
 int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path );
 
 /**
- * \brief               Read and update a seed file. Seed is added to this
- *                      instance
+ * \brief               This function reads and updates a seed file. The seed
+ *                      is added to this instance.
  *
- * \param ctx           HMAC_DRBG context
- * \param path          Name of the file
+ * \param ctx           The HMAC_DRBG context.
+ * \param path          The name of the file.
  *
- * \return              0 if successful, 1 on file error,
- *                      MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED or
- *                      MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG
+ * \return              \c 0 on success.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR on file error.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED on
+ *                      reseed failure.
+ * \return              #MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG if the existing
+ *                      seed file is too large.
  */
 int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path );
 #endif /* MBEDTLS_FS_IO */
@@ -320,9 +400,10 @@ int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const ch
 
 #if defined(MBEDTLS_SELF_TEST)
 /**
- * \brief               Checkup routine
+ * \brief               The HMAC_DRBG Checkup routine.
  *
- * \return              0 if successful, or 1 if the test failed
+ * \return              \c 0 if successful.
+ * \return              \c 1 if the test failed.
  */
 int mbedtls_hmac_drbg_self_test( int verbose );
 #endif
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/pk.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/pk.h
index 91950f940..136427503 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/pk.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/pk.h
@@ -416,6 +416,10 @@ int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
  *
  * \note            For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
  *                  For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
+ *
+ * \note            In order to ensure enough space for the signature, the
+ *                  \p sig buffer size must be of at least
+ *                  `max(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)` bytes.
  */
 int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
              const unsigned char *hash, size_t hash_len,
@@ -430,6 +434,10 @@ int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
  *                  \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
  *                  operations. For RSA, same as \c mbedtls_pk_sign().
  *
+ * \note            In order to ensure enough space for the signature, the
+ *                  \p sig buffer size must be of at least
+ *                  `max(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)` bytes.
+ *
  * \param ctx       The PK context to use. It must have been set up
  *                  with a private key.
  * \param md_alg    Hash algorithm used (see notes)
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/platform_util.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/platform_util.h
index dba6d4598..09d096518 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/platform_util.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/platform_util.h
@@ -43,6 +43,12 @@ extern "C" {
 
 #if defined(MBEDTLS_CHECK_PARAMS)
 
+#if defined(MBEDTLS_CHECK_PARAMS_ASSERT)
+/* Allow the user to define MBEDTLS_PARAM_FAILED to something like assert
+ * (which is what our config.h suggests). */
+#include <assert.h>
+#endif /* MBEDTLS_CHECK_PARAMS_ASSERT */
+
 #if defined(MBEDTLS_PARAM_FAILED)
 /** An alternative definition of MBEDTLS_PARAM_FAILED has been set in config.h.
  *
@@ -50,6 +56,11 @@ extern "C" {
  * MBEDTLS_PARAM_FAILED() will expand to a call to mbedtls_param_failed().
  */
 #define MBEDTLS_PARAM_FAILED_ALT
+
+#elif defined(MBEDTLS_CHECK_PARAMS_ASSERT)
+#define MBEDTLS_PARAM_FAILED( cond ) assert( cond )
+#define MBEDTLS_PARAM_FAILED_ALT
+
 #else /* MBEDTLS_PARAM_FAILED */
 #define MBEDTLS_PARAM_FAILED( cond ) \
     mbedtls_param_failed( #cond, __FILE__, __LINE__ )
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/rsa.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/rsa.h
index 906c42733..35bacd876 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/rsa.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/rsa.h
@@ -150,13 +150,13 @@ mbedtls_rsa_context;
  * \note           The choice of padding mode is strictly enforced for private key
  *                 operations, since there might be security concerns in
  *                 mixing padding modes. For public key operations it is
- *                 a default value, which can be overriden by calling specific
+ *                 a default value, which can be overridden by calling specific
  *                 \c rsa_rsaes_xxx or \c rsa_rsassa_xxx functions.
  *
  * \note           The hash selected in \p hash_id is always used for OEAP
  *                 encryption. For PSS signatures, it is always used for
- *                 making signatures, but can be overriden for verifying them.
- *                 If set to #MBEDTLS_MD_NONE, it is always overriden.
+ *                 making signatures, but can be overridden for verifying them.
+ *                 If set to #MBEDTLS_MD_NONE, it is always overridden.
  *
  * \param ctx      The RSA context to initialize. This must not be \c NULL.
  * \param padding  The padding mode to use. This must be either
@@ -904,7 +904,8 @@ int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
  *                 the size of the hash corresponding to \p md_alg.
  * \param sig      The buffer to hold the signature. This must be a writable
  *                 buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
- *                 for an 2048-bit RSA modulus.
+ *                 for an 2048-bit RSA modulus. A buffer length of
+ *                 #MBEDTLS_MPI_MAX_SIZE is always safe.
  *
  * \return         \c 0 if the signing operation was successful.
  * \return         An \c MBEDTLS_ERR_RSA_XXX error code on failure.
@@ -951,7 +952,8 @@ int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
  *                 the size of the hash corresponding to \p md_alg.
  * \param sig      The buffer to hold the signature. This must be a writable
  *                 buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
- *                 for an 2048-bit RSA modulus.
+ *                 for an 2048-bit RSA modulus. A buffer length of
+ *                 #MBEDTLS_MPI_MAX_SIZE is always safe.
  *
  * \return         \c 0 if the signing operation was successful.
  * \return         An \c MBEDTLS_ERR_RSA_XXX error code on failure.
@@ -1012,7 +1014,8 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
  *                 the size of the hash corresponding to \p md_alg.
  * \param sig      The buffer to hold the signature. This must be a writable
  *                 buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
- *                 for an 2048-bit RSA modulus.
+ *                 for an 2048-bit RSA modulus. A buffer length of
+ *                 #MBEDTLS_MPI_MAX_SIZE is always safe.
  *
  * \return         \c 0 if the signing operation was successful.
  * \return         An \c MBEDTLS_ERR_RSA_XXX error code on failure.
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl.h
index d31f6cdd5..1adf9608c 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl.h
@@ -2033,7 +2033,7 @@ void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
  *                 provision more than one cert/key pair (eg one ECDSA, one
  *                 RSA with SHA-256, one RSA with SHA-1). An adequate
  *                 certificate will be selected according to the client's
- *                 advertised capabilities. In case mutliple certificates are
+ *                 advertised capabilities. In case multiple certificates are
  *                 adequate, preference is given to the one set by the first
  *                 call to this function, then second, etc.
  *
@@ -3206,7 +3206,7 @@ void mbedtls_ssl_free( mbedtls_ssl_context *ssl );
  *                 mbedtls_ssl_config_defaults() or mbedtls_ssl_config_free().
  *
  * \note           You need to call mbedtls_ssl_config_defaults() unless you
- *                 manually set all of the relevent fields yourself.
+ *                 manually set all of the relevant fields yourself.
  *
  * \param conf     SSL configuration context
  */
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl_ticket.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl_ticket.h
index a84e7816e..774a007a9 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl_ticket.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/ssl_ticket.h
@@ -117,14 +117,14 @@ int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
 /**
  * \brief           Implementation of the ticket write callback
  *
- * \note            See \c mbedlts_ssl_ticket_write_t for description
+ * \note            See \c mbedtls_ssl_ticket_write_t for description
  */
 mbedtls_ssl_ticket_write_t mbedtls_ssl_ticket_write;
 
 /**
  * \brief           Implementation of the ticket parse callback
  *
- * \note            See \c mbedlts_ssl_ticket_parse_t for description
+ * \note            See \c mbedtls_ssl_ticket_parse_t for description
  */
 mbedtls_ssl_ticket_parse_t mbedtls_ssl_ticket_parse;
 
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/version.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/version.h
index ef8e4c1f4..b4eef71e5 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/version.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/version.h
@@ -40,16 +40,16 @@
  */
 #define MBEDTLS_VERSION_MAJOR  2
 #define MBEDTLS_VERSION_MINOR  16
-#define MBEDTLS_VERSION_PATCH  2
+#define MBEDTLS_VERSION_PATCH  3
 
 /**
  * The single version number has the following structure:
  *    MMNNPP00
  *    Major version | Minor version | Patch version
  */
-#define MBEDTLS_VERSION_NUMBER         0x02100200
-#define MBEDTLS_VERSION_STRING         "2.16.2"
-#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.16.2"
+#define MBEDTLS_VERSION_NUMBER         0x02100300
+#define MBEDTLS_VERSION_STRING         "2.16.3"
+#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.16.3"
 
 #if defined(MBEDTLS_VERSION_C)
 
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509.h
index 9ae825c18..63aae32d8 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509.h
@@ -77,7 +77,7 @@
 #define MBEDTLS_ERR_X509_ALLOC_FAILED                     -0x2880  /**< Allocation of memory failed. */
 #define MBEDTLS_ERR_X509_FILE_IO_ERROR                    -0x2900  /**< Read/write of file failed. */
 #define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL                 -0x2980  /**< Destination buffer is too small. */
-#define MBEDTLS_ERR_X509_FATAL_ERROR                      -0x3000  /**< A fatal error occured, eg the chain is too long or the vrfy callback failed. */
+#define MBEDTLS_ERR_X509_FATAL_ERROR                      -0x3000  /**< A fatal error occurred, eg the chain is too long or the vrfy callback failed. */
 /* \} name */
 
 /**
@@ -250,7 +250,7 @@ int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *se
  *
  * \param to       mbedtls_x509_time to check
  *
- * \return         1 if the given time is in the past or an error occured,
+ * \return         1 if the given time is in the past or an error occurred,
  *                 0 otherwise.
  */
 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to );
@@ -264,7 +264,7 @@ int mbedtls_x509_time_is_past( const mbedtls_x509_time *to );
  *
  * \param from     mbedtls_x509_time to check
  *
- * \return         1 if the given time is in the future or an error occured,
+ * \return         1 if the given time is in the future or an error occurred,
  *                 0 otherwise.
  */
 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from );
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509_crl.h b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509_crl.h
index 08a4283a6..fa838d68c 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509_crl.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/include/mbedtls/x509_crl.h
@@ -111,7 +111,7 @@ int mbedtls_x509_crl_parse_der( mbedtls_x509_crl *chain,
 /**
  * \brief          Parse one or more CRLs and append them to the chained list
  *
- * \note           Mutliple CRLs are accepted only if using PEM format
+ * \note           Multiple CRLs are accepted only if using PEM format
  *
  * \param chain    points to the start of the chain
  * \param buf      buffer holding the CRL data in PEM or DER format
@@ -126,7 +126,7 @@ int mbedtls_x509_crl_parse( mbedtls_x509_crl *chain, const unsigned char *buf, s
 /**
  * \brief          Load one or more CRLs and append them to the chained list
  *
- * \note           Mutliple CRLs are accepted only if using PEM format
+ * \note           Multiple CRLs are accepted only if using PEM format
  *
  * \param chain    points to the start of the chain
  * \param path     filename to read the CRLs from (in PEM or DER encoding)
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_cc310_backend.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_cc310_backend.a
index 8ce36c01e..e960e3ab0 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_cc310_backend.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_cc310_backend.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue.a
index 4b50d3033..e726e78af 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_cc310.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_cc310.a
index 7638c6add..fd159eca8 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_cc310.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_cc310.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_vanilla.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_vanilla.a
index fdf857e90..92fd103bd 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_vanilla.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_glue_vanilla.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_vanilla_backend.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_vanilla_backend.a
index ebbdcd415..889971018 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_vanilla_backend.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedcrypto_vanilla_backend.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a
index 377cea973..fac2adb55 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_base_vanilla.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a
index b2f1adfbf..ab381869b 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_tls_vanilla.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a
index 77b038527..63a61f154 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libmbedtls_x509_vanilla.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.1.a b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.2.a
similarity index 89%
rename from third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.1.a
rename to third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.2.a
index 7ca2e3110..de3c73bf1 100644
Binary files a/third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.1.a and b/third_party/NordicSemiconductor/libraries/nrf_security/lib/libnrf_cc310_platform_0.9.2.a differ
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52833-mbedtls-config.h b/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52833-mbedtls-config.h
index 90672cf90..d519e7b15 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52833-mbedtls-config.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52833-mbedtls-config.h
@@ -29,6 +29,8 @@
 #ifndef NRF52833_MBEDTLS_CONFIG_H_
 #define NRF52833_MBEDTLS_CONFIG_H_
 
+#define MBEDTLS_PK_WRITE_C
+
 #if defined(__ICCARM__)
     _Pragma("diag_suppress=Pe550")
 #endif
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52840-mbedtls-config.h b/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52840-mbedtls-config.h
index 88aded9d3..bbec89365 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52840-mbedtls-config.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/mbedtls_plat_config/nrf52840-mbedtls-config.h
@@ -29,6 +29,8 @@
 #ifndef NRF52840_MBEDTLS_CONFIG_H_
 #define NRF52840_MBEDTLS_CONFIG_H_
 
+#define MBEDTLS_PK_WRITE_C
+
 #include <openthread/config.h>
 
 #if defined(__ICCARM__)
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/include/nrf_cc310_platform.h b/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/include/nrf_cc310_platform.h
index 0df7658cf..a34e4f4c8 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/include/nrf_cc310_platform.h
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/include/nrf_cc310_platform.h
@@ -70,6 +70,15 @@ bool nrf_cc310_platform_is_initialized(void);
  */
 bool nrf_cc310_platform_rng_is_initialized(void);
 
+
+/** @brief ISR Function for processing of CC310 Interrupts.
+ *         This CC310 interrupt service routine function should be called for
+ *         interrupt processing.
+ *         Either by placing this functions directly in the vector table or by
+ *         calling it from the ISR in the OS.
+ */
+void CRYPTOCELL_IRQHandler(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/src/nrf_cc310_platform_abort_zephyr.c b/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/src/nrf_cc310_platform_abort_zephyr.c
index 7df6106d4..ec18630ec 100644
--- a/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/src/nrf_cc310_platform_abort_zephyr.c
+++ b/third_party/NordicSemiconductor/libraries/nrf_security/nrf_cc310_plat/src/nrf_cc310_platform_abort_zephyr.c
@@ -5,7 +5,7 @@
  * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
  */
 #include <kernel.h>
-#include <misc/reboot.h>
+#include <power/reboot.h>
 //#include <logging/log.h>
 //LOG_MODULE_DECLARE(cc310_platform);
 
diff --git a/third_party/mbedtls/Makefile.am b/third_party/mbedtls/Makefile.am
index aae66a904..81b337a9b 100644
--- a/third_party/mbedtls/Makefile.am
+++ b/third_party/mbedtls/Makefile.am
@@ -67,6 +67,7 @@ libmbedcrypto_a_SOURCES                       = \
     repo/library/pk.c                           \
     repo/library/pk_wrap.c                      \
     repo/library/pkparse.c                      \
+    repo/library/pkwrite.c                      \
     repo/library/platform.c                     \
     repo/library/platform_util.c                \
     repo/library/sha256.c                       \