decrypt String using DES and hard coded key - Android java.security

Android examples for java.security:DES

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Description

decrypt String using DES and hard coded key

Demo Code


//package com.java2s;
import android.util.Base64;
import android.util.Log;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class Main {
    private static String cryptoPass = "sup3rS3xy";

    public static String decryptIt(String value) {
        try {//from  ww  w .j a va  2 s . co  m
            DESKeySpec keySpec = new DESKeySpec(cryptoPass.getBytes("UTF8"));
            SecretKeyFactory keyFactory = SecretKeyFactory
                    .getInstance("DES");
            SecretKey key = keyFactory.generateSecret(keySpec);

            byte[] encrypedPwdBytes = Base64.decode(value, Base64.DEFAULT);
            // cipher is not thread safe
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] decrypedValueBytes = (cipher.doFinal(encrypedPwdBytes));

            String decrypedValue = new String(decrypedValueBytes);
            Log.d("Decrypt", "Decrypted: " + value + " -> " + decrypedValue);
            return decrypedValue;

        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        }
        return value;
    }
}

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