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The ProximaX Sirius Chain Java SDK is a Java library for interacting with the Sirius Blockchain.

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/*
 * Copyright 2018 NEM
 *
 * 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 io.proximax.core.crypto;

/**
 * Interface that supports signing and verification of arbitrarily sized message.
 */
public interface DsaSigner {

    /**
     * Signs the SHA3 hash of an arbitrarily sized message.
     *
     * @param data The message to sign.
     * @return The generated signature.
     */
    Signature sign(final byte[] data);

    /**
     * Verifies that the signature is valid.
     *
     * @param data      The original message.
     * @param signature The generated signature.
     * @return true if the signature is valid.
     */
    boolean verify(final byte[] data, final Signature signature);

    /**
     * Determines if the signature is canonical.
     *
     * @param signature The signature.
     * @return true if the signature is canonical.
     */
    boolean isCanonicalSignature(final Signature signature);

    /**
     * Makes this signature canonical.
     *
     * @param signature The signature.
     * @return Signature in canonical form.
     */
    Signature makeSignatureCanonical(final Signature signature);
}