mirror of
https://github.com/kmackay/micro-ecc.git
synced 2026-09-03 07:40:08 +00:00
Add AVR asm implementations for runtime curve selection.
Fast mult/square are not yet supported.
This commit is contained in:
Ken MacKay
@@ -7,36 +7,130 @@
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#define uECC_RNG_MAX_TRIES 64
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#endif
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#if uECC_SUPPORTS_secp160r1
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#define uECC_MAX_BYTES 21 /* Due to the size of curve_n. */
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#endif
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#if uECC_SUPPORTS_secp192r1
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#undef uECC_MAX_BYTES
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#define uECC_MAX_BYTES 24
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#endif
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#if uECC_SUPPORTS_secp224r1
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#undef uECC_MAX_BYTES
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#define uECC_MAX_BYTES 28
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#endif
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#if (uECC_SUPPORTS_secp256r1 || uECC_SUPPORTS_secp256k1)
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#undef uECC_MAX_BYTES
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#define uECC_MAX_BYTES 32
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#endif
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#if uECC_ENABLE_VLI_API
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#define uECC_VLI_API
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#else
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#define uECC_VLI_API static
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#endif
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#define CONCATX(a, ...) a ## __VA_ARGS__
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#define CONCAT(a, ...) CONCATX(a, __VA_ARGS__)
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#define STRX(a) #a
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#define STR(a) STRX(a)
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#define EVAL(...) EVAL1(EVAL1(EVAL1(EVAL1(__VA_ARGS__))))
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#define EVAL1(...) EVAL2(EVAL2(EVAL2(EVAL2(__VA_ARGS__))))
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#define EVAL2(...) EVAL3(EVAL3(EVAL3(EVAL3(__VA_ARGS__))))
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#define EVAL3(...) EVAL4(EVAL4(EVAL4(EVAL4(__VA_ARGS__))))
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#define EVAL4(...) __VA_ARGS__
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#define DEC_1 0
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#define DEC_2 1
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#define DEC_3 2
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#define DEC_4 3
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#define DEC_5 4
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#define DEC_6 5
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#define DEC_7 6
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#define DEC_8 7
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#define DEC_9 8
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#define DEC_10 9
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#define DEC_11 10
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#define DEC_12 11
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#define DEC_13 12
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#define DEC_14 13
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#define DEC_15 14
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#define DEC_16 15
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#define DEC_17 16
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#define DEC_18 17
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#define DEC_19 18
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#define DEC_20 19
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#define DEC_21 20
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#define DEC_22 21
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#define DEC_23 22
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#define DEC_24 23
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#define DEC_25 24
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#define DEC_26 25
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#define DEC_27 26
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#define DEC_28 27
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#define DEC_29 28
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#define DEC_30 29
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#define DEC_31 30
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#define DEC_32 31
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#define DEC(N) CONCAT(DEC_, N)
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#define SECOND_ARG(_, val, ...) val
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#define SOME_CHECK_0 ~, 0
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#define GET_SECOND_ARG(...) SECOND_ARG(__VA_ARGS__, SOME,)
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#define SOME_OR_0(N) GET_SECOND_ARG(CONCAT(SOME_CHECK_, N))
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#define EMPTY(...)
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#define DEFER(...) __VA_ARGS__ EMPTY()
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#define REPEAT_NAME_0() REPEAT_0
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#define REPEAT_NAME_SOME() REPEAT_SOME
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#define REPEAT_0(...)
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#define REPEAT_SOME(N, stuff) DEFER(CONCAT(REPEAT_NAME_, SOME_OR_0(DEC(N))))()(DEC(N), stuff) stuff
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#define REPEAT(N, stuff) EVAL(REPEAT_SOME(N, stuff))
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#define REPEATM_NAME_0() REPEATM_0
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#define REPEATM_NAME_SOME() REPEATM_SOME
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#define REPEATM_0(...)
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#define REPEATM_SOME(N, macro) macro(N) \
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DEFER(CONCAT(REPEATM_NAME_, SOME_OR_0(DEC(N))))()(DEC(N), macro)
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#define REPEATM(N, macro) EVAL(REPEATM_SOME(N, macro))
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#include "platform-specific.inc"
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#if (uECC_WORD_SIZE == 1)
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#define uECC_MAX_WORDS uECC_MAX_BYTES
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#if uECC_SUPPORTS_secp160r1
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#define uECC_MAX_WORDS 21 /* Due to the size of curve_n. */
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#endif
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#if uECC_SUPPORTS_secp192r1
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 24
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#endif
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#if uECC_SUPPORTS_secp224r1
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 28
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#endif
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#if (uECC_SUPPORTS_secp256r1 || uECC_SUPPORTS_secp256k1)
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 32
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#endif
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#elif (uECC_WORD_SIZE == 4)
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#define uECC_MAX_WORDS ((uECC_MAX_BYTES + 3) / 4)
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#if uECC_SUPPORTS_secp160r1
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#define uECC_MAX_WORDS 6 /* Due to the size of curve_n. */
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#endif
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#if uECC_SUPPORTS_secp192r1
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 6
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#endif
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#if uECC_SUPPORTS_secp224r1
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 7
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#endif
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#if (uECC_SUPPORTS_secp256r1 || uECC_SUPPORTS_secp256k1)
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 8
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#endif
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#elif (uECC_WORD_SIZE == 8)
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#define uECC_MAX_WORDS ((uECC_MAX_BYTES + 7) / 8)
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#if uECC_SUPPORTS_secp160r1
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#define uECC_MAX_WORDS 3
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#endif
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#if uECC_SUPPORTS_secp192r1
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 3
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#endif
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#if uECC_SUPPORTS_secp224r1
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 4
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#endif
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#if (uECC_SUPPORTS_secp256r1 || uECC_SUPPORTS_secp256k1)
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#undef uECC_MAX_WORDS
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#define uECC_MAX_WORDS 4
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#endif
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#endif /* uECC_WORD_SIZE */
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#define BITS_TO_WORDS(num_bits) ((num_bits + ((uECC_WORD_SIZE * 8) - 1)) / (uECC_WORD_SIZE * 8))
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@@ -63,11 +157,19 @@ struct uECC_Curve_t {
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#endif
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};
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static cmpresult_t uECC_vli_cmp_unsafe(const uECC_word_t *left,
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const uECC_word_t *right,
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wordcount_t num_words);
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#if (uECC_PLATFORM == uECC_arm || uECC_PLATFORM == uECC_arm_thumb || \
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uECC_PLATFORM == uECC_arm_thumb2)
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#include "asm_arm.inc"
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#endif
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#if (uECC_PLATFORM == uECC_avr)
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#include "asm_avr.inc"
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#endif
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#if default_RNG_defined
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static uECC_RNG_Function g_rng_function = &default_RNG;
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#else
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@@ -78,12 +180,14 @@ void uECC_set_rng(uECC_RNG_Function rng_function) {
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g_rng_function = rng_function;
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}
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#if !asm_clear
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uECC_VLI_API void uECC_vli_clear(uECC_word_t *vli, wordcount_t num_words) {
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wordcount_t i;
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for (i = 0; i < num_words; ++i) {
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vli[i] = 0;
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}
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}
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#endif /* !asm_clear */
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/* Constant-time comparison to zero - secure way to compare long integers */
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/* Returns 1 if vli == 0, 0 otherwise. */
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@@ -131,12 +235,14 @@ uECC_VLI_API bitcount_t uECC_vli_numBits(const uECC_word_t *vli, const wordcount
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}
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/* Sets dest = src. */
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#if !asm_set
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uECC_VLI_API void uECC_vli_set(uECC_word_t *dest, const uECC_word_t *src, wordcount_t num_words) {
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wordcount_t i;
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for (i = 0; i < num_words; ++i) {
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dest[i] = src[i];
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}
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}
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#endif /* !asm_set */
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/* Returns sign of left - right. */
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static cmpresult_t uECC_vli_cmp_unsafe(const uECC_word_t *left,
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@@ -182,6 +288,7 @@ uECC_VLI_API cmpresult_t uECC_vli_cmp(const uECC_word_t *left,
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}
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/* Computes vli = vli >> 1. */
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#if !asm_rshift1
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uECC_VLI_API void uECC_vli_rshift1(uECC_word_t *vli, wordcount_t num_words) {
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uECC_word_t *end = vli;
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uECC_word_t carry = 0;
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@@ -193,6 +300,7 @@ uECC_VLI_API void uECC_vli_rshift1(uECC_word_t *vli, wordcount_t num_words) {
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carry = temp << (uECC_WORD_BITS - 1);
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}
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}
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#endif /* !asm_rshift1 */
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/* Computes result = left + right, returning carry. Can modify in place. */
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#if !asm_add
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