/*
* Copyright 2016 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.credential.hash;
import org.keycloak.common.util.Base64;
import org.keycloak.credential.CredentialModel;
import org.keycloak.models.PasswordPolicy;
import org.keycloak.models.UserCredentialModel;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
/**
* @author <a href="mailto:me@tsudot.com">Kunal Kerkar</a>
*/
public class Pbkdf2PasswordHashProvider implements PasswordHashProvider {
private final String providerId;
private final String pbkdf2Algorithm;
public static final int DERIVED_KEY_SIZE = 512;
public Pbkdf2PasswordHashProvider(String providerId, String pbkdf2Algorithm) {
this.providerId = providerId;
this.pbkdf2Algorithm = pbkdf2Algorithm;
}
@Override
public boolean policyCheck(PasswordPolicy policy, CredentialModel credential) {
return credential.getHashIterations() == policy.getHashIterations() && providerId.equals(credential.getAlgorithm());
}
@Override
public void encode(String rawPassword, int iterations, CredentialModel credential) {
byte[] salt = getSalt();
String encodedPassword = encode(rawPassword, iterations, salt);
credential.setAlgorithm(providerId);
credential.setType(UserCredentialModel.PASSWORD);
credential.setSalt(salt);
credential.setHashIterations(iterations);
credential.setValue(encodedPassword);
}
@Override
public boolean verify(String rawPassword, CredentialModel credential) {
return encode(rawPassword, credential.getHashIterations(), credential.getSalt()).equals(credential.getValue());
}
public void close() {
}
private String encode(String rawPassword, int iterations, byte[] salt) {
KeySpec spec = new PBEKeySpec(rawPassword.toCharArray(), salt, iterations, DERIVED_KEY_SIZE);
try {
byte[] key = getSecretKeyFactory().generateSecret(spec).getEncoded();
return Base64.encodeBytes(key);
} catch (InvalidKeySpecException e) {
throw new RuntimeException("Credential could not be encoded", e);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
private byte[] getSalt() {
byte[] buffer = new byte[16];
SecureRandom secureRandom = new SecureRandom();
secureRandom.nextBytes(buffer);
return buffer;
}
private SecretKeyFactory getSecretKeyFactory() {
try {
return SecretKeyFactory.getInstance(pbkdf2Algorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("PBKDF2 algorithm not found", e);
}
}
}