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Java SDK for Hyperledger fabric project

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/*
 *
 *  Copyright IBM Corp. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package org.hyperledger.fabric.sdk.identity;

import org.hyperledger.fabric.sdk.exception.CryptoException;
import org.hyperledger.fabric.sdk.exception.InvalidArgumentException;

/**
 * SigningIdentity extends Identity with signing capabilities. It is used by a
 * client to sign transactions in a linkable or unlinkable fashion.
 */
public interface SigningIdentity extends Identity {

    /**
     * Sings a message with the secret key and the corresponding certificate
     *
     * @param msg
     * @return signature
     * @throws CryptoException
     * @throws InvalidArgumentException
     */
    byte[] sign(byte[] msg) throws CryptoException, InvalidArgumentException;

    /**
     * Verifies a signature on a message
     *
     * @param msg
     * @param sig
     * @return true/false
     * @throws CryptoException
     * @throws InvalidArgumentException
     */
    boolean verifySignature(byte[] msg, byte[] sig) throws CryptoException, InvalidArgumentException;
}