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Make mp_get_digit refactor FIPS friendly.

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This commit is contained in:
Kareem
2025-06-12 12:27:10 -07:00
parent 2366718d5a
commit 05aa4f5f08
3 changed files with 43 additions and 0 deletions
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wolfcrypt/src/wolfmath.c
+20
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@@ -85,7 +85,11 @@ void mp_reverse(unsigned char *s, int len)
}
}
#ifdef HAVE_FIPS
int get_digit_count(const mp_int* a)
#else
int mp_get_digit_count(const mp_int* a)
#endif
{
if (a == NULL)
return 0;
@@ -93,7 +97,11 @@ int mp_get_digit_count(const mp_int* a)
return (int)a->used;
}
#ifdef HAVE_FIPS
mp_digit get_digit(const mp_int* a, int n)
#else
mp_digit mp_get_digit(const mp_int* a, int n)
#endif
{
if (a == NULL)
return 0;
@@ -138,10 +146,18 @@ int mp_cond_copy(mp_int* a, int copy, mp_int* b)
* mp_get_digit() returns 0 when index greater than available digit.
*/
for (i = 0; i < a->used; i++) {
#ifdef HAVE_FIPS
b->dp[i] ^= (get_digit(a, (int)i) ^ get_digit(b, (int)i)) & mask;
#else
b->dp[i] ^= (mp_get_digit(a, (int)i) ^ mp_get_digit(b, (int)i)) & mask;
#endif
}
for (; i < b->used; i++) {
#ifdef HAVE_FIPS
b->dp[i] ^= (get_digit(a, (int)i) ^ get_digit(b, (int)i)) & mask;
#else
b->dp[i] ^= (mp_get_digit(a, (int)i) ^ mp_get_digit(b, (int)i)) & mask;
#endif
}
b->used ^= (a->used ^ b->used) & (wc_mp_size_t)mask;
#if (!defined(WOLFSSL_SP_MATH) && !defined(WOLFSSL_SP_MATH_ALL)) || \
@@ -156,7 +172,11 @@ int mp_cond_copy(mp_int* a, int copy, mp_int* b)
#ifndef WC_NO_RNG
#ifdef HAVE_FIPS
int get_rand_digit(WC_RNG* rng, mp_digit* d)
#else
int mp_get_rand_digit(WC_RNG* rng, mp_digit* d)
#endif
{
return wc_RNG_GenerateBlock(rng, (byte*)d, sizeof(mp_digit));
}