org.keycloak.jose.jwe.enc.AesCbcHmacShaJWEEncryptionProvider Maven / Gradle / Ivy
/*
* Copyright 2018 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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.keycloak.jose.jwe.enc;
import org.keycloak.jose.jwe.JWEConstants;
public class AesCbcHmacShaJWEEncryptionProvider extends AesCbcHmacShaEncryptionProvider {
private final int expectedCEKLength;
private final int expectedAesKeyLength;
private final String hmacShaAlgorithm;
private final int authenticationTagLength;
public AesCbcHmacShaJWEEncryptionProvider(String jwaAlgorithmName) {
if (JWEConstants.A128CBC_HS256.equals(jwaAlgorithmName)) {
expectedCEKLength = 32;
expectedAesKeyLength = 16;
hmacShaAlgorithm = "HMACSHA256";
authenticationTagLength = 16;
} else {
expectedCEKLength = 0;
expectedAesKeyLength = 0;
hmacShaAlgorithm = null;
authenticationTagLength = 0;
}
}
@Override
public int getExpectedCEKLength() {
return expectedCEKLength;
}
@Override
protected int getExpectedAesKeyLength() {
return expectedAesKeyLength;
}
@Override
protected String getHmacShaAlgorithm() {
return hmacShaAlgorithm;
}
@Override
protected int getAuthenticationTagLength() {
return authenticationTagLength;
}
}