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• powerauth-java-crypto
• 0.24.0
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• Counter.java

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io.getlime.security.powerauth.crypto.lib.api.Counter Maven / Gradle / Ivy

/*
 * PowerAuth Crypto Library
 * Copyright 2018 Wultra s.r.o.
 *
 * 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.getlime.security.powerauth.crypto.lib.api;

/**
 * Interface for byte array based counter used for cryptography.
 *
 * @author Roman Strobl, [email protected]
 *
 */
public interface Counter {

    /**
     * Initialize counter by generating initial counter data.
     * @return Initial counter data.
     */
    byte[] init();

    /**
     * Generate next counter data based on current counter data.
     * @param ctrData Current counter data.
     * @return Next counter data.
     */
    byte[] next(byte[] ctrData);

}