Background - I have a system wherein the files are moving between two servers. The server1 is encrypting the file before sending out and it is decrypted by the server2 at the receiving end. And while sending it back, file is encrypted and the server1 decrypts the recieved file.
Currently, for this - Triple DES 128 bit algo is being implemented. And now would like to switch to AES 256 bit algo.
Here is the code snippet for both --If you could please have a look at it, and confirm that the new one that is AES 256 bit has been implemented correctly or not.
TRIPLE DES[u]
CODE
import org.apache.log4j.Logger;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.util.StringTokenizer;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import java.io.*;
/**
* Utility class for performing cryptography using DESede (Triple DES) 128-bit
* algorithm
*/
public class Crypto {
private static Logger logger = Logger.getLogger(Crypto.class);
// DESede = Triple DES encryption
private static final String ALGORITHM = "DESede";
private static final String KEY_STRING = "172-29-987-1-58-555-910-747-"
+ "914-654-9-59-478-20-907-846-" + "77-69-650-213-12-73-264-652";
private Cipher encryptCipher;
private Cipher decryptCipher;
private static Crypto instance;
private Crypto() {
try {
// Get our secret key
Key key = getKey();
// initialise our ciphers
// Create and initialize the encryption engine
encryptCipher = Cipher.getInstance(ALGORITHM);
logger.debug("Crypto: encryptCipher instance created");
decryptCipher = Cipher.getInstance(ALGORITHM);
logger.debug("Crypto: decryptCipher instance created");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
logger.debug("Crypto: encryptCipher initialised");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
logger.debug("Crypto: decryptCipher initialised");
} catch (NoSuchAlgorithmException e) {
logger.error("<init>", e);
} catch (NoSuchPaddingException e) {
logger.error("<init>", e);
} catch (InvalidKeyException e) {
logger.error("<init>", e);
}
}
public static Crypto getInstance() {
if (instance == null) {
instance = new Crypto();
}
return instance;
}
public byte[] encrypt(byte[] source) {
try {
synchronized (encryptCipher) {
// Encrypt the source bytes, returning encrypted bytes
logger.debug("Encrypt the source bytes, returning encrypted bytes");
logger.debug("encrypted bytes: "+encryptCipher.doFinal(source));
return encryptCipher.doFinal(source);
}
} catch (Exception e) {
logger.error("encrypt", e);
}
return null;
}
public byte[] decrypt(byte[] source) {
try {
synchronized (decryptCipher) {
// Decrypt the bytes, returning decrypted bytes
return decryptCipher.doFinal(source);
}
} catch (Exception e) {
logger.error("decrypt", e);
}
return null;
}
/**
*
* @param source
* @param dest
* @return true if the operation was successful, false otherwise
*/
public boolean encryptFile(File source, File dest) {
boolean returnVal = false;
logger.debug("Crypto-encryptFile: source:" + source);
logger.debug("Crypto-encryptFile: destination:" + dest);
if (!source.isFile()) {
logger.debug("encryptFile: Source file does not exist - "+ source.getAbsolutePath());
returnVal = false;
} else {
try {
synchronized (encryptCipher) {
logger.debug("encryptFile: Encrypting file "+ source.getAbsolutePath() + " to " + dest.getAbsolutePath());
BufferedInputStream in = new BufferedInputStream(new FileInputStream(source));
CipherOutputStream out = new CipherOutputStream(new FileOutputStream(dest), encryptCipher);
byte[] buf = new byte[4096];
int len = 0;
while ((len = in.read(buf)) >= 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
logger.debug("encryptFile: Encrypting file completed "
+ source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
}
returnVal = true;
} catch (IOException e) {
logger.warn("decryptFile", e);
}
}
return returnVal;
}
/**
*
* @param source
* @param dest
* @return true if the operation was successful, false otherwise
*/
public synchronized boolean decryptFile(File source, File dest) {
boolean returnVal = false;
if (!source.isFile()) {
logger.debug("decryptFile: Source file does not exist - "
+ source.getAbsolutePath());
returnVal = false;
} else {
try {
synchronized (decryptCipher) {
logger.debug("decryptFile: Decrypting file "
+ source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
CipherInputStream in = new CipherInputStream(
new FileInputStream(source), decryptCipher);
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(dest));
byte[] buf = new byte[4096];
int len = 0;
while ((len = in.read(buf)) >= 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
logger.debug("decryptFile: Decrypting file completed "
+ source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
}
returnVal = true;
} catch (IOException e) {
logger.warn("decryptFile", e);
}
}
return returnVal;
}
private Key getKey() {
try {
byte[] bytes = getBytes(KEY_STRING);
return new SecretKeySpec(bytes, ALGORITHM);
} catch (Exception e) {
logger.error("getKey", e);
}
return null;
}
private byte[] getBytes(String str) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
StringTokenizer st = new StringTokenizer(str, "-", false);
while (st.hasMoreTokens()) {
int i = Integer.parseInt(st.nextToken());
bos.write((byte) i);
}
return bos.toByteArray();
}
}
AES 256 bitCODE
import org.apache.log4j.Logger;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.util.StringTokenizer;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import java.io.*;
public class Crypto {
private static Logger logger = Logger.getLogger(Crypto.class);
private Cipher encryptCipher;
private Cipher decryptCipher;
private static final String ALGORITHM = "AES";
private static Crypto instance;
public Crypto()
{
try
{
// Get our secret key
SecretKeySpec skey = getSKeySpec();
encryptCipher = Cipher.getInstance(ALGORITHM);
logger.debug("Crypto: encryptCipher instance created");
decryptCipher = Cipher.getInstance(ALGORITHM);
logger.debug("Crypto: decryptCipher instance created");
// CBC requires an initialization vector
encryptCipher.init(Cipher.ENCRYPT_MODE, skey);
logger.debug("Crypto: encryptCipher initialised");
decryptCipher.init(Cipher.DECRYPT_MODE, skey);
logger.debug("Crypto: decryptCipher initialised");
}
catch (NoSuchAlgorithmException e) {
logger.error("<init>", e);
} catch (NoSuchPaddingException e) {
logger.error("<init>", e);
} catch (InvalidKeyException e) {
logger.error("<init>", e);
}
}
public static Crypto getInstance() {
if (instance == null) {
instance = new Crypto();
}
return instance;
}
public byte[] encrypt(byte[] source) {
try {
synchronized (encryptCipher) {
// Encrypt the source bytes, returning encrypted bytes
logger.debug("Encrypt the source bytes, returning encrypted bytes");
logger.debug("encrypted bytes: "+encryptCipher.doFinal(source));
return encryptCipher.doFinal(source);
}
} catch (Exception e) {
logger.error("encrypt", e);
}
return null;
}
public byte[] decrypt(byte[] source) {
try {
synchronized (decryptCipher) {
// Decrypt the bytes, returning decrypted bytes
return decryptCipher.doFinal(source);
}
} catch (Exception e) {
logger.error("decrypt", e);
}
return null;
}
// Buffer used to transport the bytes from one stream to another
// byte[] buf = new byte[1024];
public boolean encryptFile(File source, File dest)
{
boolean returnVal = false;
if (!source.isFile()) {
logger.debug("encryptFile: Source file does not exist - "+ source.getAbsolutePath());
returnVal = false;
} else {
try
{
synchronized (encryptCipher) {
logger.debug("encryptFile: Encrypting file "+ source.getAbsolutePath() + " to " + dest.getAbsolutePath());
BufferedInputStream in = new BufferedInputStream(new FileInputStream(source));
CipherOutputStream out = new CipherOutputStream(new FileOutputStream(dest), encryptCipher);
byte[] buf = new byte[4096];
// Read in the cleartext bytes and write to out to encrypt
int len = 0;
while ((len = in.read(buf)) >= 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
logger.debug("encryptFile: Encrypting file completed "
+ source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
}
returnVal = true;
} catch (IOException e) {
logger.warn("decryptFile", e);
}
}
return returnVal;
}
public boolean decryptFile(File source, File dest)
{
boolean returnVal = false;
if (!source.isFile()) {
logger.debug("decryptFile: Source file does not exist - "
+ source.getAbsolutePath());
returnVal = false;
} else {
try
{
synchronized (decryptCipher) {
logger.debug("decryptFile: Decrypting file "+ source.getAbsolutePath() + " to "+ dest.getAbsolutePath());
CipherInputStream in = new CipherInputStream(new FileInputStream(source), decryptCipher);
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
byte[] buf = new byte[4096];
int len = 0;
while ((len = in.read(buf)) >= 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
logger.debug("decryptFile: Decrypting file completed "+ source.getAbsolutePath() + " to "+ dest.getAbsolutePath());
}
returnVal = true;
} catch (IOException e) {
logger.warn("decryptFile", e);
}
}
return returnVal;
}
private SecretKeySpec getSKeySpec() {
byte[] bytes = new byte[16];
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(256);
SecretKey skey = kgen.generateKey();
bytes = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(bytes,ALGORITHM);
return skeySpec;
} catch (Exception e) {
logger.error("getKey", e);
}
return null;
}
}
I have downloaded the unlimited JCE files for the same.
Forum Index:
Programming Help |
C and C++ |
VB6 |
Java |
VB.NET |
C# |
ASP.NET |
PHP |
ColdFusion |
Perl and Python |
Ruby |
Databases |
Other Languages |
Game Programming |
Mobile Development |
Software Development |
Computer Science |
Industry News |
Programming Tutorials |
C++ Tutorials |
Visual Basic Tutorials |
Java Tutorials |
VB.NET Tutorials |
C# Tutorials |
Linux Tutorials |
PHP Tutorials |
ColdFusion Tutorials |
Windows Tutorials |
HTML/JavaScript Tutorials |
CSS Tutorials |
Flash Tutorials |
Web Promotion Tutorials |
Graphic Design & Photoshop Tutorials |
Software Development Tutorials |
Database Tutorials |
Other Language Tutorials |
ASP.NET Tutorials |
Game Programming Tutorials |
| 
