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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2019 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.openecomp.sdc.security;
import fj.data.Either;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import java.util.Formatter;
public class SecurityUtil {
private static final Logger LOG = LoggerFactory.getLogger( SecurityUtil.class );
private static final byte[] KEY = new byte[]{-64,5,-32 ,-117 ,-44,8,-39, 1, -9, 36,-46,-81, 62,-15,-63,-75};
public static final SecurityUtil INSTANCE = new SecurityUtil();
public static final String ALGORITHM = "AES" ;
public static final String CHARSET = StandardCharsets.UTF_8.name();
private static Key secKey = null ;
private SecurityUtil(){ super(); }
/**
*
* cmd commands >$PROGRAM_NAME decrypt "$ENCRYPTED_MSG"
* >$PROGRAM_NAME encrypt "message"
**/
public static void main(String[] args) throws Exception {
if ( args!=null && args.length>1){
fj.data.Either res = null;
final String op = args[0].trim().toLowerCase();
try{
switch(op) {
case "decrypt":
res = INSTANCE.decrypt(Base64.getDecoder().decode(args[1]), true);
break;
case "encrypt":
res = INSTANCE.encrypt(args[1]);
break;
default:
LOG.warn("Unfamiliar command please use: \n>aes <encrypt/decrypt> 'message to encrypt/decrypt' ");
}
}catch(Exception e){
LOG.warn("Exception while message encryption or decryption");
throw e;
}
LOG.debug( "output: {}", res!=null && res.isLeft() ? res.left().value() : "ERROR" );
}
}
static {
Formatter formatter = new Formatter();
try{
secKey = generateKey( KEY, ALGORITHM );
}
catch(Exception e){
if(LOG.isWarnEnabled())
{
LOG.warn(formatter.format("cannot generate key for %s", ALGORITHM).toString(), e);
}
}finally {
formatter.close();
}
}
public static Key generateKey(final byte[] key, String algorithm){
return new SecretKeySpec(key, algorithm);
}
//obfuscates key prefix -> **********
public String obfuscateKey(String sensitiveData){
if (sensitiveData != null){
int len = sensitiveData.length();
StringBuilder builder = new StringBuilder(sensitiveData);
for (int i=0; i<len/2; i++){
builder.setCharAt(i, '*');
}
return builder.toString();
}
return sensitiveData;
}
/**
* @param strDataToEncrypt - plain string to encrypt
* Encrypt the Data
* a. Declare / Initialize the Data. Here the data is of type String
* b. Convert the Input Text to Bytes
* c. Encrypt the bytes using doFinal method
*/
public Either<String,String> encrypt(String strDataToEncrypt){
if (strDataToEncrypt != null ){
Formatter formatter = new Formatter();
try{
LOG.debug("Encrypt key -> {}", secKey);
Cipher aesCipherForEncryption = Cipher.getInstance("AES"); // Must specify the mode explicitly as most JCE providers default to ECB mode!!
aesCipherForEncryption.init(Cipher.ENCRYPT_MODE, secKey);
byte[] byteDataToEncrypt = strDataToEncrypt.getBytes();
byte[] byteCipherText = aesCipherForEncryption.doFinal(byteDataToEncrypt);
String strCipherText = new String( java.util.Base64.getMimeEncoder().encode(byteCipherText), CHARSET );
LOG.debug("Cipher Text generated using AES is {}", strCipherText);
return Either.left(strCipherText);
} catch( NoSuchAlgorithmException | UnsupportedEncodingException e){
if(LOG.isWarnEnabled())
{
LOG.warn(formatter.format("cannot encrypt data unknown algorithm or missing encoding for %s",secKey.getAlgorithm()).toString(), e);
}
} catch( InvalidKeyException e){
if(LOG.isWarnEnabled())
{
LOG.warn(formatter.format("invalid key recieved - > %s", java.util.Base64.getDecoder().decode(secKey.getEncoded())).toString(), e);
}
} catch( IllegalBlockSizeException | BadPaddingException | NoSuchPaddingException e){
if(LOG.isWarnEnabled())
{
LOG.warn("bad algorithm definition (Illegal Block Size or padding), please review you algorithm block&padding", e);
}
}
finally {
formatter.close();
}
}
return Either.right("Cannot encrypt "+strDataToEncrypt);
}
/**
* Decrypt the Data
* @param byteCipherText - should be valid bae64 input in the length of 16bytes
* @param isBase64Decoded - is data already base64 encoded&aligned to 16 bytes
* a. Initialize a new instance of Cipher for Decryption (normally don't reuse the same object)
* b. Decrypt the cipher bytes using doFinal method
*/
public Either<String,String> decrypt(byte[] byteCipherText , boolean isBase64Decoded){
if (byteCipherText != null){
byte[] alignedCipherText = byteCipherText;
Formatter formatter = new Formatter();
try{
if (isBase64Decoded)
alignedCipherText = Base64.getDecoder().decode(byteCipherText);
LOG.debug("Decrypt key -> {}", secKey.getEncoded());
Cipher aesCipherForDecryption = Cipher.getInstance("AES"); // Must specify the mode explicitly as most JCE providers default to ECB mode!!
aesCipherForDecryption.init(Cipher.DECRYPT_MODE, secKey);
byte[] byteDecryptedText = aesCipherForDecryption.doFinal(alignedCipherText);
String strDecryptedText = new String(byteDecryptedText);
String obfuscateKey = obfuscateKey( strDecryptedText );
LOG.debug("Decrypted Text message is: {}" , obfuscateKey);
return Either.left(strDecryptedText);
} catch( NoSuchAlgorithmException e){
if(LOG.isWarnEnabled())
{
LOG.warn(formatter.format("cannot encrypt data unknown algorithm or missing encoding for %s", secKey.getAlgorithm()).toString(), e);
}
} catch( InvalidKeyException e){
if(LOG.isWarnEnabled())
{
LOG.warn(formatter.format("invalid key recieved - > %s", java.util.Base64.getDecoder().decode(secKey.getEncoded())).toString(), e);
}
} catch( IllegalBlockSizeException | BadPaddingException | NoSuchPaddingException e){
if(LOG.isWarnEnabled())
{
LOG.warn( "bad algorithm definition (Illegal Block Size or padding), please review you algorithm block&padding", e);
}
}finally {
formatter.close();
}
}
return Either.right("Decrypt FAILED");
}
public Either<String,String> decrypt(String byteCipherText){
Formatter formatter = new Formatter();
try {
return decrypt(byteCipherText.getBytes(CHARSET),true);
} catch( UnsupportedEncodingException e ){
if(LOG.isWarnEnabled())
{
LOG.warn(formatter.format("Missing encoding for %s",secKey.getAlgorithm()).toString(), e);
}
}finally {
formatter.close();
}
return Either.right("Decrypt FAILED");
}
}
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