diff options
| -rw-r--r-- | crypto/bn/bn_gf2m.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/crypto/bn/bn_gf2m.c b/crypto/bn/bn_gf2m.c index 8a4dc20..fe04784 100644 --- a/crypto/bn/bn_gf2m.c +++ b/crypto/bn/bn_gf2m.c @@ -568,9 +568,10 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx) } #else { - int i, ubits = BN_num_bits(u), - vbits = BN_num_bits(v), /* v is copy of p */ - top = p->top; + int i; + int ubits = BN_num_bits(u); + int vbits = BN_num_bits(v); /* v is copy of p */ + int top = p->top; BN_ULONG *udp,*bdp,*vdp,*cdp; bn_wexpand(u,top); udp = u->d; @@ -611,7 +612,12 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx) ubits--; } - if (ubits<=BN_BITS2 && udp[0]==1) break; + if (ubits <= BN_BITS2) { + if (udp[0] == 0) /* poly was reducible */ + goto err; + if (udp[0] == 1) + break; + } if (ubits<vbits) { |