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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Nokia.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.oom.certservice.certification.conversion;
import org.bouncycastle.util.io.pem.PemObject;
import org.onap.oom.certservice.certification.exception.KeyDecryptionException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
public class StringBase64ToPrivateKeyConverter {
private final PemObjectFactory pemObjectFactory = new PemObjectFactory();
public PrivateKey convert(StringBase64 privateKey) throws KeyDecryptionException {
PemObject decodedPrivateKey = createDecodedPrivateKey(privateKey);
try {
KeyFactory factory = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decodedPrivateKey.getContent());
return factory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
throw new KeyDecryptionException("Converting Private Key failed", e.getCause());
}
}
private PemObject createDecodedPrivateKey(StringBase64 privateKey) throws KeyDecryptionException {
return privateKey.asString()
.flatMap(pemObjectFactory::createPemObject)
.orElseThrow(
() -> new KeyDecryptionException("Incorrect Key, decryption failed")
);
}
}
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