diff options
Diffstat (limited to 'openssl/crypto/bn/bn_gf2m.c')
| -rw-r--r-- | openssl/crypto/bn/bn_gf2m.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/openssl/crypto/bn/bn_gf2m.c b/openssl/crypto/bn/bn_gf2m.c index aeee49a01..cfa1c7ce1 100644 --- a/openssl/crypto/bn/bn_gf2m.c +++ b/openssl/crypto/bn/bn_gf2m.c @@ -450,8 +450,7 @@ int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const int p[]) d0 = p[k] % BN_BITS2; d1 = BN_BITS2 - d0; z[n] ^= (zz << d0); - tmp_ulong = zz >> d1; - if (d0 && tmp_ulong) + if (d0 && (tmp_ulong = zz >> d1)) z[n + 1] ^= tmp_ulong; } @@ -694,9 +693,10 @@ 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); @@ -740,8 +740,12 @@ 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) { i = ubits; |