New function EC_KEY_set_affine_coordinates() this performs all the

[thirdparty/openssl.git] / crypto / ec / ec_key.c

diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c
index 86e6cec06d817cefdbbfb1eee45f28e785084ddb..a9e780da443a5350b18a10bafd9f7d86879ed4d0 100644 (file)
--- 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;