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add dsa sign sanity check on r/s

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toddouska
2016-09-22 12:04:48 -07:00
parent 18944dacbf
commit d9163e4554
1 changed files with 4 additions and 0 deletions
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4
wolfcrypt/src/dsa.c
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@@ -401,6 +401,10 @@ int wc_DsaSign(const byte* digest, byte* out, DsaKey* key, WC_RNG* rng)
if (ret == 0 && mp_mulmod(&s, &kInv, &key->q, &s) != MP_OKAY)
ret = MP_MULMOD_E;
/* detect zero r or s */
if (ret == 0 && (mp_iszero(&r) == MP_YES || mp_iszero(&s) == MP_YES))
ret = MP_ZERO_E;
/* write out */
if (ret == 0) {
int rSz = mp_unsigned_bin_size(&r);