Subversion Repositories SmartDukaan

package com.saholic.profittill.Utils;

import android.util.Base64;

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;

public class DESEncrypter {

    Cipher ecipher;
    Cipher dcipher;

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

    int iterationCount = 19;

    public DESEncrypter(String passPhrase) {
        try {
            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) {
            e.printStackTrace();
        } catch (java.security.spec.InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (java.security.NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (java.security.InvalidKeyException e) {
            e.printStackTrace();
        }
    }

    public String encrypt(String str) {
        try {
            byte[] utf8 = str.getBytes("UTF8");
            byte[] enc = ecipher.doFinal(utf8);
            return Base64.encodeToString(enc, Base64.URL_SAFE);
        } catch (javax.crypto.BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }

    public String decrypt(String str) {
        try {
            byte[] dec = Base64.decode(str, android.util.Base64.DEFAULT);
            byte[] utf8 = dcipher.doFinal(dec);
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}