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/*-
* ============LICENSE_START=======================================================
* PolicyEngineUtils
* ================================================================================
* Copyright (C) 2018 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=========================================================
*/
package org.onap.policy.utils;
import java.nio.charset.StandardCharsets;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Key;
import java.util.Base64;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
public class CryptoUtils {
private static final Logger LOGGER = FlexLogger.getLogger(CryptoUtils.class);
private static final String CIPHER_TYPE = "AES/CBC/PKCS5Padding";
private static Key mKey = null;
private static AlgorithmParameters mAlgParm = null;
static {
//the hadcoded key is to be removed in a future iteration
try {
String kval = "bmpybWJrbGN4dG9wbGF3Zg==";
String algp = "BBBpbml0VmVjVGhpc0lzVGhl";
byte[] kvalb = DatatypeConverter.parseBase64Binary(kval);
byte[] algb = DatatypeConverter.parseBase64Binary(algp);
mKey = new SecretKeySpec(kvalb, "AES");
mAlgParm = AlgorithmParameters.getInstance("AES");
mAlgParm.init(algb, "ASN.1");
} catch (Exception ex) {
throw new ExceptionInInitializerError(ex);
}
}
private CryptoUtils() {
// Private Constructor
}
/**
* Decrypt txt.
*
* @param encryptedTxt
* text to be decrypted, Base 64 UrlEncoded
* @return the byte[]
* @throws NoSuchAlgorithmException
* the no such algorithm exception
* @throws NoSuchPaddingException
* the no such padding exception
* @throws InvalidAlgorithmParameterException
* the invalid algorithm parameter exception
* @throws InvalidKeyException
* the invalid key exception
* @throws IllegalBlockSizeException
* the illegal block size exception
* @throws BadPaddingException
* the bad padding exception
*/
public static byte[] decryptTxt(String encryptedTxt)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
Cipher cipher = Cipher.getInstance(CIPHER_TYPE);
cipher.init(Cipher.DECRYPT_MODE, mKey, mAlgParm);
return cipher.doFinal(Base64.getUrlDecoder().decode(encryptedTxt.getBytes(StandardCharsets.UTF_8)));
}
/**
* Decrypt txt.
*
* @param encryptedTxt
* text to be decrypted, Base 64 UrlEncoded
* @param mKey
* the key as Base 64
* @return the byte[]
* @throws NoSuchAlgorithmException
* the no such algorithm exception
* @throws NoSuchPaddingException
* the no such padding exception
* @throws InvalidAlgorithmParameterException
* the invalid algorithm parameter exception
* @throws InvalidKeyException
* the invalid key exception
* @throws IllegalBlockSizeException
* the illegal block size exception
* @throws BadPaddingException
* the bad padding exception
*/
public static byte[] decryptTxt(String encryptedTxt, String base64BinaryKey)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
byte[] keyValueByte = DatatypeConverter.parseBase64Binary(base64BinaryKey);
Key paramKey = new SecretKeySpec(keyValueByte, "AES");
Cipher cipher = Cipher.getInstance(CIPHER_TYPE);
cipher.init(Cipher.DECRYPT_MODE, paramKey, mAlgParm);
return cipher.doFinal(Base64.getUrlDecoder().decode(encryptedTxt.getBytes(StandardCharsets.UTF_8)));
}
/**
* Decrypt txt, no exceptions thrown.
*
* @param encryptedTxt
* text to be decrypted, Base 64 UrlEncoded
* @return the decrypted text, or the original text if it could not be
* decrypted
*/
public static byte[] decryptTxtNoEx(String encryptedTxt) {
try {
if (encryptedTxt == null || encryptedTxt.isEmpty()) {
LOGGER.error("decryptTxtNoEx: Input param encryptedTxt is not valid");
return new byte[0];
}
return decryptTxt(encryptedTxt);
} catch (Exception e) {
try {
LOGGER.warn("decryptTxtNoEx: Exception while decryption : " + e);
return (encryptedTxt != null) ? encryptedTxt.getBytes(StandardCharsets.UTF_8) : new byte[0];
} catch (Exception e1) {
LOGGER.warn("decryptTxtNoEx: Exception on sending default : " + e1);
return new byte[0];
}
}
}
/**
* Decrypt txt, no exceptions thrown.
*
* @param encryptedTxt
* text to be decrypted, Base 64 UrlEncoded
* @return the decrypted text, or the original text if it could not be
* decrypted
*/
public static String decryptTxtNoExStr(String encryptedTxt) {
return new String(decryptTxtNoEx(encryptedTxt), StandardCharsets.UTF_8);
}
/**
* Encrypt txt.
*
* @param plainTxt
* the plain txt
* @return the encrypted string
* @throws NoSuchPaddingException
* the no such padding exception
* @throws InvalidAlgorithmParameterException
* the invalid algorithm parameter exception
* @throws NoSuchAlgorithmException
* the no such algorithm exception
* @throws InvalidKeyException
* the invalid key exception
* @throws IllegalBlockSizeException
* the illegal block size exception
* @throws BadPaddingException
* the bad padding exception
*/
public static String encryptTxt(byte[] plainTxt)
throws NoSuchPaddingException, InvalidAlgorithmParameterException,
NoSuchAlgorithmException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
Cipher cipher = Cipher.getInstance(CIPHER_TYPE);
cipher.init(Cipher.ENCRYPT_MODE, mKey, mAlgParm);
byte[] encryption = cipher.doFinal(plainTxt);
return new String(Base64.getUrlEncoder().encode(encryption), StandardCharsets.UTF_8);
}
/**
* Encrypt txt.
*
* @param plainTxt
* the plain txt to be encrypted
* @param base64BinaryKey
* the key as lexical representation of Base64 Binary
* @return the encrypted string
* @throws NoSuchPaddingException
* the no such padding exception
* @throws InvalidAlgorithmParameterException
* the invalid algorithm parameter exception
* @throws NoSuchAlgorithmException
* the no such algorithm exception
* @throws InvalidKeyException
* the invalid key exception
* @throws IllegalBlockSizeException
* the illegal block size exception
* @throws BadPaddingException
* the bad padding exception
*/
public static String encryptTxt(byte[] plainTxt, String base64BinaryKey)
throws NoSuchPaddingException, InvalidAlgorithmParameterException,
NoSuchAlgorithmException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
byte[] keyValueByte = DatatypeConverter.parseBase64Binary(base64BinaryKey);
Key paramKey = new SecretKeySpec(keyValueByte, "AES");
Cipher cipher = Cipher.getInstance(CIPHER_TYPE);
cipher.init(Cipher.ENCRYPT_MODE, paramKey, mAlgParm);
byte[] encryption = cipher.doFinal(plainTxt);
return new String(Base64.getMimeEncoder().encode(encryption), StandardCharsets.UTF_8);
}
/**
* Encrypt txt, no exceptions thrown
*
* @param plainTxt
* the plain txt to be encrypted
* @return the encrypted String , or the original text if it could not be
* encrypted
*/
public static String encryptTxtNoEx(byte[] plainTxt) {
if (plainTxt == null || plainTxt.length == 0) {
LOGGER.error("encryptTxtNoEx: Input param plainTxt is not valid");
return "";
}
try {
return encryptTxt(plainTxt);
} catch (Exception e) {
LOGGER.error("encryptTxtNoEx: Exception while decryption : " + e);
return new String(plainTxt, StandardCharsets.UTF_8);
}
}
}
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