Subversion Repositories SmartDukaan

package in.shop2020.serving.utils;

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("shop2020");
                System.out.println(desEncrypter.decrypt("BVl-z9SkaLo"));
        }
}