DES Decrypt
/* Copyright c 2005-2012.
* Licensed under GNU LESSER General Public License, Version 3.
* http://www.gnu.org/licenses
*/
package org.beangle.security.codec;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class DESDecrypt {
public DESDecrypt(byte desKey[]) {
this.desKey = desKey;
}
public byte[] doDecrypt(byte encryptText[]) throws Exception {
SecureRandom sr = new SecureRandom();
byte rawKeyData[] = desKey;
DESKeySpec dks = new DESKeySpec(rawKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
javax.crypto.SecretKey key = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(2, key, sr);
byte encryptedData[] = encryptText;
byte decryptedData[] = cipher.doFinal(encryptedData);
return decryptedData;
}
public static void main(String args[]) throws Exception {
String key = "ABCDEFGH";
String value = "AABBCCDDEE";
DESEncrypt desEncrypt = new DESEncrypt(key.getBytes());
byte encryptText[] = desEncrypt.doEncrypt(value.getBytes());
System.out.println("doEncrypt - " + toHexString(encryptText));
System.out.println("doEncrypt - " + new String(encryptText));
DESDecrypt desDecrypt = new DESDecrypt(key.getBytes());
byte decryptText[] = desDecrypt.doDecrypt(encryptText);
System.out.println("doDecrypt - " + new String(decryptText));
System.out.println("doDecrypt - " + toHexString(decryptText));
}
public static String toHexString(byte value[]) {
String newString = "";
for (int i = 0; i < value.length; i++) {
byte b = value[i];
String str = Integer.toHexString(b);
if (str.length() > 2) str = str.substring(str.length() - 2);
if (str.length() < 2) str = "0" + str;
newString = newString + str;
}
return newString.toUpperCase();
}
private byte desKey[];
}
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