Subversion Repositories SmartDukaan

package in.shop2020.util;

import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;

public class DesEncrypter {
    
    private static Logger logger = Logger.getLogger(DesEncrypter.class);
    
    Cipher ecipher;
    Cipher dcipher;

    // 8-byte Salt
    byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
            (byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03 };

    // Iteration count
    int iterationCount = 19;

    public DesEncrypter(String passPhrase) {
        try {
            // Create the key
            KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt,
                    iterationCount);
            SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES")
                    .generateSecret(keySpec);
            ecipher = Cipher.getInstance(key.getAlgorithm());
            dcipher = Cipher.getInstance(key.getAlgorithm());

            // Prepare the parameter to the ciphers
            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

            // Create the ciphers
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        } catch (java.security.InvalidAlgorithmParameterException e) {
            logger.error("Unable to initialize the cipher", e);
        } catch (java.security.spec.InvalidKeySpecException e) {
            logger.error("Unable to initialize the cipher", e);
        } catch (javax.crypto.NoSuchPaddingException e) {
            logger.error("Unable to initialize the cipher", e);
        } catch (java.security.NoSuchAlgorithmException e) {
            logger.error("Unable to initialize the cipher", e);
        } catch (java.security.InvalidKeyException e) {
            logger.error("Unable to initialize the cipher", e);
        }
    }

    public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");

            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);

            // Encode bytes to base64 to get a string
            return Base64.encodeBase64URLSafeString(enc);
        } catch (javax.crypto.BadPaddingException e) {
            logger.error("Encryption failed because of bad padding", e);
        } catch (IllegalBlockSizeException e) {
            logger.error("Encryption failed because of illegal block size", e);
        } catch (UnsupportedEncodingException e) {
            logger.error("Encryption failed because the underlying encoding is unsupported", e);
        }
        return null;
    }

    public String decrypt(String str) {
        try {
            // Decode base64 encoded string to get bytes
            byte[] dec = Base64.decodeBase64(str);

            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);

            // Decode using utf-8
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
            logger.error("Encryption failed because of bad padding", e);
        } catch (IllegalBlockSizeException e) {
            logger.error("Encryption failed because of illegal block size", e);
        } catch (UnsupportedEncodingException e) {
            logger.error("Encryption failed because the underlying encoding is unsupported", e);
        }
        return null;
    }
    
    public static void main(String[] args){
        DesEncrypter desEncrypter = new DesEncrypter("saholic");
        System.out.println(desEncrypter.encrypt("pud8SQuI6p"));
    }
}