New function EC_KEY_set_affine_coordinates() this performs all the

NIST PKV tests.

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

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"},

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;