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/*-
* ============LICENSE_START=======================================================
* ONAP CLAMP
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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.
* ============LICENSE_END============================================
* ===================================================================
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.onap.clamp.clds.util;
import java.security.GeneralSecurityException;
import javax.annotation.PostConstruct;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.core.annotation.Order;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
/**
* CryptoUtils for encrypting/decrypting string based on a Key defined in
* application.properties (Spring config file).
*
*/
@Component("CryptoUtils")
@Order(Ordered.HIGHEST_PRECEDENCE)
public final class CryptoUtils {
public static final String AES = "AES";
public static final String KEY_PARAM = "org.onap.clamp.encryption.aes.key";
@Autowired
private Environment springEnv;
private SecretKeySpec secretKeySpec;
/**
* Initialize Method
*
*/
@PostConstruct
public void init() {
secretKeySpec = getSecretKeySpec(springEnv.getProperty(KEY_PARAM));
}
/**
* Encrypt a value based on the Clamp Encryption Key.
*
* @param value
* @return The encrypted string
* @throws GeneralSecurityException
* In case of issue with the encryption
*/
public String encrypt(String value) throws GeneralSecurityException {
Cipher cipher = Cipher.getInstance(CryptoUtils.AES);
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, cipher.getParameters());
byte[] encrypted = cipher.doFinal(value.getBytes());
return byteArrayToHexString(encrypted);
}
/**
* Decrypt a value.
*
* @param message
* The encrypted string that must be decrypted using the Clamp
* Encryption Key
* @return The String decrypted
* @throws GeneralSecurityException
* In case of issue with the encryption
*/
public String decrypt(String message) throws GeneralSecurityException {
Cipher cipher = Cipher.getInstance(CryptoUtils.AES);
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
byte[] decrypted = cipher.doFinal(hexStringToByteArray(message));
return new String(decrypted);
}
private SecretKeySpec getSecretKeySpec(String keyString) {
byte[] key = hexStringToByteArray(keyString);
return new SecretKeySpec(key, CryptoUtils.AES);
}
private String byteArrayToHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
int v = b[i] & 0xff;
if (v < 16) {
sb.append('0');
}
sb.append(Integer.toHexString(v));
}
return sb.toString().toUpperCase();
}
private byte[] hexStringToByteArray(String s) {
byte[] b = new byte[s.length() / 2];
for (int i = 0; i < b.length; i++) {
int index = i * 2;
int v = Integer.parseInt(s.substring(index, index + 2), 16);
b[i] = (byte) v;
}
return b;
}
}
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