org.conscrypt.DESEDESecretKeyFactory Maven / Gradle / Ivy
/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.conscrypt;
import java.security.InvalidKeyException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactorySpi;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.SecretKeySpec;
/**
* An implementation of {@link javax.crypto.SecretKeyFactory} for use with DESEDE keys. This
* class supports {@link SecretKeySpec} and {@link DESedeKeySpec} for key specs.
*
* @hide
*/
@Internal
public class DESEDESecretKeyFactory extends SecretKeyFactorySpi {
public DESEDESecretKeyFactory() {}
@Override
protected SecretKey engineGenerateSecret(KeySpec keySpec) throws InvalidKeySpecException {
if (keySpec == null) {
throw new InvalidKeySpecException("Null KeySpec");
}
if (keySpec instanceof SecretKeySpec) {
SecretKeySpec key = (SecretKeySpec) keySpec;
try {
if (!DESedeKeySpec.isParityAdjusted(key.getEncoded(), 0)) {
throw new InvalidKeySpecException(
"SecretKeySpec is not a parity-adjusted DESEDE key");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException(e);
}
return key;
} else if (keySpec instanceof DESedeKeySpec) {
DESedeKeySpec desKeySpec = (DESedeKeySpec) keySpec;
return new SecretKeySpec(desKeySpec.getKey(), "DESEDE");
} else {
throw new InvalidKeySpecException(
"Unsupported KeySpec class: " + keySpec.getClass().getName());
}
}
@Override
protected KeySpec engineGetKeySpec(SecretKey secretKey,
@SuppressWarnings("rawtypes") Class aClass) throws InvalidKeySpecException {
if (secretKey == null) {
throw new InvalidKeySpecException("Null SecretKey");
}
if (aClass == SecretKeySpec.class) {
try {
if (!DESedeKeySpec.isParityAdjusted(secretKey.getEncoded(), 0)) {
throw new InvalidKeySpecException("SecretKey is not a parity-adjusted DESEDE key");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException(e);
}
if (secretKey instanceof SecretKeySpec) {
return (KeySpec) secretKey;
} else {
return new SecretKeySpec(secretKey.getEncoded(), "DESEDE");
}
} else if (aClass == DESedeKeySpec.class) {
try {
return new DESedeKeySpec(secretKey.getEncoded());
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException(e);
}
} else {
throw new InvalidKeySpecException("Unsupported KeySpec class: " + aClass);
}
}
@Override
protected SecretKey engineTranslateKey(SecretKey secretKey) throws InvalidKeyException {
if (secretKey == null) {
throw new InvalidKeyException("Null SecretKey");
}
return new SecretKeySpec(secretKey.getEncoded(), secretKey.getAlgorithm());
}
}