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Add in clamp for mp_sqrtmod_prime

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This commit is contained in:
Andras Fekete
2023-08-09 10:44:59 -04:00
parent c9b72d7b61
commit 9b81b0b505
1 changed files with 6 additions and 0 deletions
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6
wolfcrypt/src/ecc.c
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@ -14710,6 +14710,12 @@ int mp_sqrtmod_prime(mp_int* n, mp_int* prime, mp_int* ret)
/* Z = Z + 1 */ /* Z = Z + 1 */
if (res == MP_OKAY) if (res == MP_OKAY)
res = mp_add_d(Z, 1, Z); res = mp_add_d(Z, 1, Z);
if ((res == MP_OKAY) && (mp_cmp(Z,prime) == MP_EQ)) {
/* This is to clamp the loop in case 'prime' is not really prime */
res = MP_VAL;
break;
}
} }
/* C = Z ^ Q mod prime */ /* C = Z ^ Q mod prime */