Android Open Source - Joetz-Android-V2 A E S Encryption

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.jens.myapplication.util;
/*w  w  w. j av a2 s.  c  om*/
import android.util.Base64;
import android.util.Log;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

/**
 Aes encryption
 */
public class AESEncryption {
    private static final String ENCRYPTION_KEY = "6fO35)_-851*AcbF";

    private static SecretKeySpec secretKey;
    private static byte[] key;

    private static void initKey() {
        MessageDigest sha = null;
        try {
            key = ENCRYPTION_KEY.getBytes("UTF-8");
            sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16); // use only first 128 bit
            secretKey = new SecretKeySpec(key, "AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String strToEncrypt) {
        if(key == null){
            initKey();
        }

        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

            cipher.init(Cipher.ENCRYPT_MODE, secretKey);

//            setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));
            return Base64.encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")), Base64.DEFAULT);
        } catch (Exception e) {
            Log.e("AESEncryption", "Error while encrypting: " + e.toString());
        }
        return null;
    }

    public static String decrypt(String strToDecrypt) {
        if(key == null){
            initKey();
        }

        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");

            cipher.init(Cipher.DECRYPT_MODE, secretKey);

            //setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));
            return new String(cipher.doFinal(Base64.decode(strToDecrypt, Base64.DEFAULT)));
        } catch (Exception e) {
            Log.e("AESEncryption", "Error while decrypting: " + e.toString());
        }
        return null;
    }
}

Java Source Code List

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