com.qubole.quark.catalog.db.encryption.MysqlAES Maven / Gradle / Ivy
/*
* Copyright (c) 2015. Qubole Inc
* 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 com.qubole.quark.catalog.db.encryption;
import org.apache.commons.codec.binary.Hex;
import java.io.IOException;
import java.sql.SQLException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
* Encrypt/decrypt data for/from db using Mysql AES algorithm.
*/
public class MysqlAES {
private String key;
private static MysqlAES mysqlAES;
private MysqlAES() {}
public static MysqlAES getInstance() {
if (mysqlAES == null) {
mysqlAES = new MysqlAES();
}
return mysqlAES;
}
public void setKey(String key) {
this.key = key;
}
public static SecretKeySpec generateMySQLAESKey(String key, String encoding) {
try {
byte[] finalKey = new byte[16];
int i = 0;
for (byte b : key.getBytes(encoding)) {
finalKey[i++ % 16] ^= b;
}
return new SecretKeySpec(finalKey, "AES");
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public String convertToDatabaseColumn(String phrase) throws SQLException {
try {
Cipher encryptCipher = Cipher.getInstance("AES");
encryptCipher.init(Cipher.ENCRYPT_MODE,
generateMySQLAESKey(this.key, "UTF-8"));
return new String(Hex.encodeHex(encryptCipher.doFinal(phrase.getBytes("UTF-8"))));
} catch (Exception e) {
throw new SQLException(e);
}
}
public String convertToEntityAttribute(String phrase) throws SQLException {
try {
Cipher decryptCipher = Cipher.getInstance("AES");
decryptCipher.init(Cipher.DECRYPT_MODE,
generateMySQLAESKey(this.key, "UTF-8"));
return new String(decryptCipher.doFinal(Hex.decodeHex(phrase.toCharArray())));
} catch (Exception e) {
throw new SQLException(e);
}
}
}