Thaks in advance for reading my thread....
my boss given meonly five days time to implement 128-bit encryption code...
and we prepared some code in java...
and thats not giving the exact ouput of encrypted and decrypted text ....
Please Provide any 128-bit Encryption code snippets so that i can move forward the below is the code which i prepared
//package encryption;
import java.math.BigInteger;
import java.security.SecureRandom;
import java.lang.*;
import org.bouncycastle.crypto.AsymmetricBlockCipher;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.encodings.PKCS1Encoding;
import org.bouncycastle.crypto.engines.RSAEngine;
import org.bouncycastle.crypto.generators.RSAKeyPairGenerator;
import org.bouncycastle.crypto.params.RSAKeyGenerationParameters;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
public class Encryption {
private RSAPrivateCrtKeyParameters _RSAPrivateKey;
private RSAKeyParameters _RSAPublicKey;
public static void main(String[] args) {
Encryption theEncryption = new Encryption();
String theStringBeforeEncryption = "r";
String theStringAfterEncryption = null;
byte[] theEncryptedString;
try {
System.out.println(theStringBeforeEncryption);
theEncryption.generateRSAKeyPair();
theEncryptedString = theEncryption.RSAEncrypt(theStringBeforeEncryption.getBytes());
String str=(new Base64Converter()).encode(theEncryptedString);
System.out.println(str);
System.out.println(theEncryptedString);
theStringAfterEncryption = new String(theEncryption.RSADecrypt(theEncryptedString));
System.out.println(theStringAfterEncryption);
}
catch (Exception e)
{
// TODO Handle exception!
e.printStackTrace();
}
}
private void generateRSAKeyPair ( ) throws Exception {
SecureRandom theSecureRandom = new SecureRandom();
BigInteger thePublicExponent = new BigInteger("10001", 16);
RSAKeyGenerationParameters theRSAKeyGenParam =
new RSAKeyGenerationParameters(thePublicExponent, theSecureRandom, 1024, 80);
RSAKeyPairGenerator theRSAKeyPairGen = new RSAKeyPairGenerator();
theRSAKeyPairGen.init(theRSAKeyGenParam);
AsymmetricCipherKeyPair theKeyPair = theRSAKeyPairGen.generateKeyPair();
_RSAPrivateKey = (RSAPrivateCrtKeyParameters) theKeyPair.getPrivate();
_RSAPublicKey = (RSAKeyParameters) theKeyPair.getPublic();
}
private byte [] RSAEncrypt (byte [] toEncrypt) throws Exception
{
if (_RSAPublicKey == null)
{
throw new Exception("Please generate RSA keys first in order to work");
}
AsymmetricBlockCipher theEngine = new RSAEngine();
theEngine = new PKCS1Encoding(theEngine);
theEngine.init(true, _RSAPublicKey);
return theEngine.processBlock(toEncrypt, 0, toEncrypt.length);
}
private byte [] RSADecrypt (byte [] toDecrypt) throws Exception {
if (_RSAPrivateKey == null)
{
throw new Exception("Please generate RSA keys first in order to work");
}
AsymmetricBlockCipher theEngine = new RSAEngine();
theEngine = new PKCS1Encoding(theEngine);
theEngine.init(false, _RSAPrivateKey);
return theEngine.processBlock(toDecrypt, 0, toDecrypt.length);
}
}
class Base64Converter
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
{
public static final char [ ] alphabet = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0 to 7
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8 to 15
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16 to 23
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24 to 31
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32 to 39
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40 to 47
'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48 to 55
'4', '5', '6', '7', '8', '9', '+', '/' }; // 56 to 63
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
public static String encode ( String s )
//////////////////////////////////////////////////////////////////////
{
return encode ( s.getBytes ( ) );
}
public static String encode ( byte [ ] octetString )
//////////////////////////////////////////////////////////////////////
{
int bits24;
int bits6;
char [ ] out
= new char [ ( ( octetString.length - 1 ) / 3 + 1 ) * 4 ];
int outIndex = 0;
int i = 0;
while ( ( i + 3 ) <= octetString.length )
{
// store the octets
bits24 = ( octetString [ i++ ] & 0xFF ) << 16;
bits24 |= ( octetString [ i++ ] & 0xFF ) << 8;
bits24 |= ( octetString [ i++ ] & 0xFF ) << 0;
bits6 = ( bits24 & 0x00FC0000 ) >> 18;
out [ outIndex++ ] = alphabet [ bits6 ];
bits6 = ( bits24 & 0x0003F000 ) >> 12;
out [ outIndex++ ] = alphabet [ bits6 ];
bits6 = ( bits24 & 0x00000FC0 ) >> 6;
out [ outIndex++ ] = alphabet [ bits6 ];
bits6 = ( bits24 & 0x0000003F );
out [ outIndex++ ] = alphabet [ bits6 ];
}
if ( octetString.length - i == 2 )
{
// store the octets
bits24 = ( octetString [ i ] & 0xFF ) << 16;
bits24 |= ( octetString [ i + 1 ] & 0xFF ) << 8;
bits6 = ( bits24 & 0x00FC0000 ) >> 18;
out [ outIndex++ ] = alphabet [ bits6 ];
bits6 = ( bits24 & 0x0003F000 ) >> 12;
out [ outIndex++ ] = alphabet [ bits6 ];
bits6 = ( bits24 & 0x00000FC0 ) >> 6;
out [ outIndex++ ] = alphabet [ bits6 ];
// padding
out [ outIndex++ ] = '=';
}
else if ( octetString.length - i == 1 )
{
// store the octets
bits24 = ( octetString [ i ] & 0xFF ) << 16;
bits6 = ( bits24 & 0x00FC0000 ) >> 18;
out [ outIndex++ ] = alphabet [ bits6 ];
bits6 = ( bits24 & 0x0003F000 ) >> 12;
out [ outIndex++ ] = alphabet [ bits6 ];
// padding
out [ outIndex++ ] = '=';
out [ outIndex++ ] = '=';
}
return new String ( out );
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
}