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Merge pull request #4019 from dgarske/zd11435

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ECC, SP math all: Add `wc_ecc_gen_k` arg checking. Fix SP math debug support (mp_dump)
This commit is contained in:
Sean Parkinson
2021-05-12 08:21:56 +10:00
committed by GitHub
parent c75830e2e8 7e69277680
commit 8a17e6c10e
2 changed files with 15 additions and 7 deletions
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14
wolfcrypt/src/ecc.c
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@@ -3222,13 +3222,13 @@ int wc_ecc_mulmod_ex2(const mp_int* k, ecc_point *G, ecc_point *R, mp_int* a,
if (err == MP_OKAY) {
int kIsMinusOne = (mp_cmp((mp_int*)k, &t) == MP_EQ);
err = mp_cond_copy(tG->x, kIsMinusOne, R->x);
if (err == 0) {
if (err == MP_OKAY) {
err = mp_sub(modulus, tG->y, &t);
}
if (err == 0) {
if (err == MP_OKAY) {
err = mp_cond_copy(&t, kIsMinusOne, R->y);
}
if (err == 0) {
if (err == MP_OKAY) {
err = mp_cond_copy(tG->z, kIsMinusOne, R->z);
}
}
@@ -4291,8 +4291,12 @@ int wc_ecc_gen_k(WC_RNG* rng, int size, mp_int* k, mp_int* order)
int err;
byte buf[ECC_MAXSIZE_GEN];
/*generate 8 extra bytes to mitigate bias from the modulo operation below*/
/*see section A.1.2 in 'Suite B Implementor's Guide to FIPS 186-3 (ECDSA)'*/
if (rng == NULL || size > ECC_MAXSIZE_GEN || k == NULL || order == NULL) {
return BAD_FUNC_ARG;
}
/* generate 8 extra bytes to mitigate bias from the modulo operation below */
/* see section A.1.2 in 'Suite B Implementor's Guide to FIPS 186-3 (ECDSA)' */
size += 8;
/* make up random string */

8
wolfssl/wolfcrypt/sp_int.h
View File

@@ -156,7 +156,7 @@ extern "C" {
#endif
/* Detemine the number of bits to use in each word. */
/* Determine the number of bits to use in each word. */
#ifdef SP_WORD_SIZE
#elif defined(WOLFSSL_DSP_BUILD)
#define SP_WORD_SIZE 32
@@ -510,7 +510,7 @@ typedef struct sp_ecc_ctx {
#define sp_print_digit(a, s)
#define sp_print_int(a, s)
#endif
#endif /* !NO_FILESYSTEM */
/* Returns whether multi-precision number is odd
*
@@ -978,8 +978,12 @@ WOLFSSL_API word32 CheckRunTimeFastMath(void);
#define mp_gcd sp_gcd
#define mp_lcm sp_lcm
#ifdef WOLFSSL_DEBUG_MATH
#define mp_dump(d, a, v) sp_print(a, d)
#endif
#endif /* WOLFSSL_SP_MATH || WOLFSSL_SP_MATH_ALL */
#ifdef __cplusplus
} /* extern "C" */
#endif