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Rapidoid Commons

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/*
 * Copyright (C) 2015 Square, Inc.
 *
 * 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 keywhiz.hkdf;

/**
 * Representation for HKDF-supported HMAC functions.
 */
public enum Hash {
	SHA256("HmacSHA256", 32),
	SHA1("HmacSHA1", 20);
	// MD5 intentionally omitted

	private final String algorithm;
	private final int byteLength;

	Hash(String algorithm, int byteLength) {
		if (byteLength <= 0) {
			throw new IllegalArgumentException("byteLength must be positive");
		}
		this.algorithm = algorithm;
		this.byteLength = byteLength;
	}

	/**
	 * @return JCA-recognized algorithm name.
	 */
	public String getAlgorithm() {
		return algorithm;
	}

	/**
	 * @return length of HMAC output in bytes.
	 */
	public int getByteLength() {
		return byteLength;
	}
}