keywhiz.hkdf.Hash Maven / Gradle / Ivy
/*
* 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;
}
}