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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.cmpv2client.impl.protections;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cmp.PBMParameter;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import static org.onap.oom.certservice.cmpv2client.impl.CmpUtil.createRandomBytes;
import static org.onap.oom.certservice.cmpv2client.impl.CmpUtil.createRandomInt;
/**
* Implementation of password-based PKIMessage protection
*/
public class PasswordBasedProtection extends PkiMessageProtection {
private static final int ITERATIONS = createRandomInt(1000);
private static final byte[] SALT = createRandomBytes();
private static final AlgorithmIdentifier OWF_ALGORITHM =
new AlgorithmIdentifier(new ASN1ObjectIdentifier("1.3.14.3.2.26"));
private static final AlgorithmIdentifier MAC_ALGORITHM =
new AlgorithmIdentifier(new ASN1ObjectIdentifier("1.3.6.1.5.5.8.1.2"));
private static final ASN1ObjectIdentifier PASSWORD_BASED_MAC =
new ASN1ObjectIdentifier("1.2.840.113533.7.66.13");
private final String initAuthPassword;
public PasswordBasedProtection(String initAuthPassword) {
this.initAuthPassword = initAuthPassword;
}
@Override
public AlgorithmIdentifier getAlgorithmIdentifier() {
ASN1Integer iteration = new ASN1Integer(ITERATIONS);
DEROctetString derSalt = new DEROctetString(SALT);
PBMParameter pp = new PBMParameter(derSalt, OWF_ALGORITHM, iteration, MAC_ALGORITHM);
return new AlgorithmIdentifier(PASSWORD_BASED_MAC, pp);
}
@Override
byte[] generateProtectionBytes(byte[] protectedBytes) throws GeneralSecurityException {
byte[] baseKey = generateBaseKey();
return generateMacBytes(baseKey, protectedBytes);
}
private byte[] generateBaseKey() throws NoSuchAlgorithmException, NoSuchProviderException {
byte[] raSecret = initAuthPassword.getBytes();
byte[] baseKey = new byte[raSecret.length + SALT.length];
System.arraycopy(raSecret, 0, baseKey, 0, raSecret.length);
System.arraycopy(SALT, 0, baseKey, raSecret.length, SALT.length);
MessageDigest dig =
MessageDigest.getInstance(
OWF_ALGORITHM.getAlgorithm().getId(), BouncyCastleProvider.PROVIDER_NAME);
for (int i = 0; i < ITERATIONS; i++) {
baseKey = dig.digest(baseKey);
dig.reset();
}
return baseKey;
}
private byte[] generateMacBytes(byte[] baseKey, byte[] protectedBytes) throws GeneralSecurityException {
Mac mac = Mac.getInstance(MAC_ALGORITHM.getAlgorithm().getId(), BouncyCastleProvider.PROVIDER_NAME);
SecretKey key = new SecretKeySpec(baseKey, MAC_ALGORITHM.getAlgorithm().getId());
mac.init(key);
mac.reset();
mac.update(protectedBytes, 0, protectedBytes.length);
return mac.doFinal();
}
}
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