diff options
| -rw-r--r-- | crypto/ec/ec.h | 11 | ||||
| -rw-r--r-- | crypto/ec/ec_err.c | 2 | ||||
| -rw-r--r-- | crypto/ec/ec_key.c | 77 |
3 files changed, 89 insertions, 1 deletions
diff --git a/crypto/ec/ec.h b/crypto/ec/ec.h index fb42dae346..6409eee1b3 100644 --- a/crypto/ec/ec.h +++ b/crypto/ec/ec.h @@ -806,6 +806,15 @@ int EC_KEY_generate_key(EC_KEY *key); */ int EC_KEY_check_key(const EC_KEY *key); +/** Sets a public key from affine coordindates performing + * neccessary NIST PKV tests. + * \param key the EC_KEY object + * \param x public key x coordinate + * \param y public key y coordinate + * \return 1 on success and 0 otherwise. + */ +int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y); + /********************************************************************/ /* de- and encoding functions for SEC1 ECPrivateKey */ @@ -1021,6 +1030,7 @@ void ERR_load_EC_strings(void); #define EC_F_EC_KEY_NEW 182 #define EC_F_EC_KEY_PRINT 180 #define EC_F_EC_KEY_PRINT_FP 181 +#define EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES 229 #define EC_F_EC_POINTS_MAKE_AFFINE 136 #define EC_F_EC_POINT_ADD 112 #define EC_F_EC_POINT_CMP 113 @@ -1066,6 +1076,7 @@ void ERR_load_EC_strings(void); #define EC_R_ASN1_UNKNOWN_FIELD 116 #define EC_R_BIGNUM_OUT_OF_RANGE 144 #define EC_R_BUFFER_TOO_SMALL 100 +#define EC_R_COORDINATES_OUT_OF_RANGE 146 #define EC_R_D2I_ECPKPARAMETERS_FAILURE 117 #define EC_R_DECODE_ERROR 142 #define EC_R_DISCRIMINANT_IS_ZERO 118 diff --git a/crypto/ec/ec_err.c b/crypto/ec/ec_err.c index 1f8cbf538c..a05e44c031 100644 --- a/crypto/ec/ec_err.c +++ b/crypto/ec/ec_err.c @@ -158,6 +158,7 @@ static ERR_STRING_DATA EC_str_functs[]= {ERR_FUNC(EC_F_EC_KEY_NEW), "EC_KEY_new"}, {ERR_FUNC(EC_F_EC_KEY_PRINT), "EC_KEY_print"}, {ERR_FUNC(EC_F_EC_KEY_PRINT_FP), "EC_KEY_print_fp"}, +{ERR_FUNC(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES), "EC_KEY_set_public_key_affine_coordinates"}, {ERR_FUNC(EC_F_EC_POINTS_MAKE_AFFINE), "EC_POINTs_make_affine"}, {ERR_FUNC(EC_F_EC_POINT_ADD), "EC_POINT_add"}, {ERR_FUNC(EC_F_EC_POINT_CMP), "EC_POINT_cmp"}, @@ -206,6 +207,7 @@ static ERR_STRING_DATA EC_str_reasons[]= {ERR_REASON(EC_R_ASN1_UNKNOWN_FIELD) ,"asn1 unknown field"}, {ERR_REASON(EC_R_BIGNUM_OUT_OF_RANGE) ,"bignum out of range"}, {ERR_REASON(EC_R_BUFFER_TOO_SMALL) ,"buffer too small"}, +{ERR_REASON(EC_R_COORDINATES_OUT_OF_RANGE),"coordinates out of range"}, {ERR_REASON(EC_R_D2I_ECPKPARAMETERS_FAILURE),"d2i ecpkparameters failure"}, {ERR_REASON(EC_R_DECODE_ERROR) ,"decode error"}, {ERR_REASON(EC_R_DISCRIMINANT_IS_ZERO) ,"discriminant is zero"}, diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c index 86e6cec06d..a9e780da44 100644 --- a/crypto/ec/ec_key.c +++ b/crypto/ec/ec_key.c @@ -310,7 +310,7 @@ int EC_KEY_check_key(const EC_KEY *eckey) ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY); goto err; } - + if ((ctx = BN_CTX_new()) == NULL) goto err; if ((point = EC_POINT_new(eckey->group)) == NULL) @@ -371,6 +371,81 @@ err: return(ok); } +int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y) + { + BN_CTX *ctx = NULL; + BIGNUM *tx, *ty; + EC_POINT *point = NULL; + int ok = 0, tmp_nid, is_char_two = 0; + + if (!key || !key->group || !x || !y) + { + ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, + ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + ctx = BN_CTX_new(); + if (!ctx) + goto err; + + point = EC_POINT_new(key->group); + + if (!point) + goto err; + + tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group)); + + if (tmp_nid == NID_X9_62_characteristic_two_field) + is_char_two = 1; + + tx = BN_CTX_get(ctx); + ty = BN_CTX_get(ctx); + + if (is_char_two) + { + if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point, + x, y, ctx)) + goto err; + if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point, + tx, ty, ctx)) + goto err; + } + else + { + if (!EC_POINT_set_affine_coordinates_GFp(key->group, point, + x, y, ctx)) + goto err; + if (!EC_POINT_get_affine_coordinates_GFp(key->group, point, + tx, ty, ctx)) + goto err; + } + /* Check if retrieved coordinates match originals: if not values + * are out of range. + */ + if (BN_cmp(x, tx) || BN_cmp(y, ty)) + { + ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, + EC_R_COORDINATES_OUT_OF_RANGE); + goto err; + } + + if (!EC_KEY_set_public_key(key, point)) + goto err; + + if (EC_KEY_check_key(key) == 0) + goto err; + + ok = 1; + + err: + if (ctx) + BN_CTX_free(ctx); + if (point) + EC_POINT_free(point); + return ok; + + } + const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key) { return key->group; |