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Define derived config macros for entropy sources

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Define `MBEDTLS_ENTROPY_TRUE_SOURCES` and `MBEDTLS_ENTROPY_HAVE_SOURCES`
similarly to TF-PSA-Crypto 1.0. Also define
`MBEDTLS_ENTROPY_HAVE_TRUE_SOURCES` for test function dependencies.

Signed-off-by: Gilles Peskine <[email protected]>
This commit is contained in:
Gilles Peskine
2026-03-04 17:54:56 +01:00
parent 178cda8cc6
commit 2a92659034
1 changed files with 43 additions and 0 deletions
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include/mbedtls/config_adjust_legacy_crypto.h
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@@ -48,6 +48,49 @@
#endif
#endif /* _MINGW32__ || (_MSC_VER && (_MSC_VER <= 1900)) */
/* The number of "true" entropy sources (excluding NV seed).
* This must be consistent with mbedtls_entropy_init() in entropy.c.
*/
/* Define auxiliary macros, because in standard C, defined(xxx) is only
* allowed directly on an #if or #elif line, not in recursive expansion. */
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
#define MBEDTLS_ENTROPY_HARDWARE_ALT_DEFINED 1
#else
#define MBEDTLS_ENTROPY_HARDWARE_ALT_DEFINED 0
#endif
#if defined(MBEDTLS_NO_PLATFORM_ENTROPY)
#define MBEDTLS_PLATFORM_ENTROPY_DEFINED 1
#else
#define MBEDTLS_PLATFORM_ENTROPY_DEFINED 0
#endif
#define MBEDTLS_ENTROPY_TRUE_SOURCES ( \
MBEDTLS_ENTROPY_HARDWARE_ALT_DEFINED + \
MBEDTLS_PLATFORM_ENTROPY_DEFINED + \
0)
/* Whether there is at least one entropy source for the entropy module.
*
* Note that when MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG is enabled, the entropy
* module is unused and the configuration will typically not include any
* entropy source, so this macro will typically remain undefined.
*/
#if defined(MBEDTLS_ENTROPY_NV_SEED)
#define MBEDTLS_ENTROPY_HAVE_SOURCES (MBEDTLS_ENTROPY_TRUE_SOURCES + 1)
#elif MBEDTLS_ENTROPY_TRUE_SOURCES != 0
#define MBEDTLS_ENTROPY_HAVE_SOURCES MBEDTLS_ENTROPY_TRUE_SOURCES
#else
#undef MBEDTLS_ENTROPY_HAVE_SOURCES
#endif
/* Test function dependencies can only check with defined(),
* not other preprocessor expressions. */
#if MBEDTLS_ENTROPY_TRUE_SOURCES > 0
#define MBEDTLS_ENTROPY_HAVE_TRUE_SOURCES
#else
#undef MBEDTLS_ENTROPY_HAVE_TRUE_SOURCES
#endif
/* If MBEDTLS_PSA_CRYPTO_C is defined, make sure MBEDTLS_PSA_CRYPTO_CLIENT
* is defined as well to include all PSA code.
*/