diff options
Diffstat (limited to 'crypto/dsa/dsa_ossl.c')
| -rw-r--r-- | crypto/dsa/dsa_ossl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c index 412cf1d88b690..172776080669b 100644 --- a/crypto/dsa/dsa_ossl.c +++ b/crypto/dsa/dsa_ossl.c @@ -178,7 +178,8 @@ static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa) if (!BN_mod_mul(&xr,dsa->priv_key,r,dsa->q,ctx)) goto err;/* s = xr */ if (!BN_add(s, &xr, &m)) goto err; /* s = m + xr */ if (BN_cmp(s,dsa->q) > 0) - BN_sub(s,s,dsa->q); + if (!BN_sub(s,s,dsa->q)) + goto err; if (!BN_mod_mul(s,s,kinv,dsa->q,ctx)) goto err; ret=DSA_SIG_new(); |