diff options
Diffstat (limited to 'crypto/ec/ecp_nistp521.c')
| -rw-r--r-- | crypto/ec/ecp_nistp521.c | 49 |
1 files changed, 21 insertions, 28 deletions
diff --git a/crypto/ec/ecp_nistp521.c b/crypto/ec/ecp_nistp521.c index d2d73526f6..0293147783 100644 --- a/crypto/ec/ecp_nistp521.c +++ b/crypto/ec/ecp_nistp521.c @@ -169,32 +169,21 @@ static void felem_to_bin66(u8 out[66], const felem in) (*((limb *) & out[58])) = in[8]; } -/* To preserve endianness when using BN_bn2bin and BN_bin2bn */ -static void flip_endian(u8 *out, const u8 *in, unsigned len) -{ - unsigned i; - for (i = 0; i < len; ++i) - out[i] = in[len - 1 - i]; -} - /* BN_to_felem converts an OpenSSL BIGNUM into an felem */ static int BN_to_felem(felem out, const BIGNUM *bn) { - felem_bytearray b_in; felem_bytearray b_out; - unsigned num_bytes; + int num_bytes; - num_bytes = BN_num_bytes(bn); - if (num_bytes > sizeof(b_out)) { + if (BN_is_negative(bn)) { ECerr(EC_F_BN_TO_FELEM, EC_R_BIGNUM_OUT_OF_RANGE); return 0; } - if (BN_is_negative(bn)) { + num_bytes = BN_bn2lebinpad(bn, b_out, sizeof(b_out)); + if (num_bytes < 0) { ECerr(EC_F_BN_TO_FELEM, EC_R_BIGNUM_OUT_OF_RANGE); return 0; } - num_bytes = BN_bn2binpad(bn, b_in, sizeof(b_in)); - flip_endian(b_out, b_in, num_bytes); bin66_to_felem(out, b_out); return 1; } @@ -202,10 +191,9 @@ static int BN_to_felem(felem out, const BIGNUM *bn) /* felem_to_BN converts an felem into an OpenSSL BIGNUM */ static BIGNUM *felem_to_BN(BIGNUM *out, const felem in) { - felem_bytearray b_in, b_out; - felem_to_bin66(b_in, in); - flip_endian(b_out, b_in, sizeof(b_out)); - return BN_bin2bn(b_out, sizeof(b_out), out); + felem_bytearray b_out; + felem_to_bin66(b_out, in); + return BN_lebin2bn(b_out, sizeof(b_out), out); } /*- @@ -1864,8 +1852,8 @@ int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r, felem_bytearray *secrets = NULL; felem (*pre_comp)[17][3] = NULL; felem *tmp_felems = NULL; - felem_bytearray tmp; - unsigned i, num_bytes; + unsigned i; + int num_bytes; int have_pre_comp = 0; size_t num_points = num; felem x_in, y_in, z_in, x_out, y_out, z_out; @@ -1966,10 +1954,16 @@ int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r, ECerr(EC_F_EC_GFP_NISTP521_POINTS_MUL, ERR_R_BN_LIB); goto err; } - num_bytes = BN_bn2binpad(tmp_scalar, tmp, sizeof(tmp)); - } else - num_bytes = BN_bn2binpad(p_scalar, tmp, sizeof(tmp)); - flip_endian(secrets[i], tmp, num_bytes); + num_bytes = BN_bn2lebinpad(tmp_scalar, + secrets[i], sizeof(secrets[i])); + } else { + num_bytes = BN_bn2lebinpad(p_scalar, + secrets[i], sizeof(secrets[i])); + } + if (num_bytes < 0) { + ECerr(EC_F_EC_GFP_NISTP521_POINTS_MUL, ERR_R_BN_LIB); + goto err; + } /* precompute multiples */ if ((!BN_to_felem(x_out, p->X)) || (!BN_to_felem(y_out, p->Y)) || @@ -2012,10 +2006,9 @@ int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r, ECerr(EC_F_EC_GFP_NISTP521_POINTS_MUL, ERR_R_BN_LIB); goto err; } - num_bytes = BN_bn2binpad(tmp_scalar, tmp, sizeof(tmp)); + num_bytes = BN_bn2lebinpad(tmp_scalar, g_secret, sizeof(g_secret)); } else - num_bytes = BN_bn2binpad(scalar, tmp, sizeof(tmp)); - flip_endian(g_secret, tmp, num_bytes); + num_bytes = BN_bn2lebinpad(scalar, g_secret, sizeof(g_secret)); /* do the multiplication with generator precomputation */ batch_mul(x_out, y_out, z_out, (const felem_bytearray(*))secrets, num_points, |