适用于Commons Codec中的encodeBuffer方法的替换

Question

I have a piece of code which encrypts and decrypts using AES algorithm, which was using sun.misc.* packages.

Later i came to know it is wrong to use those set of packages which made me follow the advice of using Apache's Commons Codec which is effective.

The previous code was as below :

import java.security.*;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;


import sun.misc.*;

public class AESencrp {
private static final String ALGO = "AES";
private static final byte[] keyValue = 
    new byte[] { 'T', 'h', 'e', 'B', 'e', 's', 't','S', 'e', 'c', 'r','e', 't', 'K', 'e', 'y' };

public static String encrypt(String Data) throws Exception {
    Key key = generateKey();
    Cipher c = Cipher.getInstance(ALGO);
    c.init(Cipher.ENCRYPT_MODE, key);
    byte[] encVal = c.doFinal(Data.getBytes());
    String encryptedValue = new BASE64Encoder().encode(encVal);
    return encryptedValue;
}

public static String decrypt(String encryptedData) throws Exception {
    Key key = generateKey();
    Cipher c = Cipher.getInstance(ALGO);
    c.init(Cipher.DECRYPT_MODE, key);
    byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);
    byte[] decValue = c.doFinal(decordedValue);
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

private static Key generateKey() throws Exception {
    Key key = new SecretKeySpec(keyValue, ALGO);
    return key;
}



}

As suggested I have removed sun.misc and did the following alteration.

After replacing BASE64Encoder class with Base64 in Apache's commons codec:

 public static String encrypt(String Data) throws Exception {
            Key key = generateKey();
            Cipher c = Cipher.getInstance(ALGO);
            c.init(Cipher.ENCRYPT_MODE, key);
            byte[] encVal = c.doFinal(Data.getBytes());
            byte[] encryptedValue = new Base64().encode(encVal);
            return new String(encryptedValue);
        }

I am not able to find a suitable replacement for decryption as i am struck at line:

byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);

I am not finding any method which does the job of decodeBuffer(String encryptedData) and returns me a byte array of decodedValue.

Answer 1

OK, Then what about this?

Using apache Base64 util class is similar to that of sun.misc.Base64Encoder. Apache Base64 class provides many overload methods that will relieve you of conversion between bytes and String.

byte[] encodedBytes  = Base64.encodeBase64(testString.getBytes());

String decodedString = new String(Base64.decodeBase64(encodedBytes));

Answer 2

public class EncryptionDecrption {

    private static final String ALGO = "AES";
    private static final byte[] keyValue = new byte[]{'T', 'h', 'e', 'R', 'o', 'o', 'K', 'n', 'a', 't','E','n', 'i', 'r','i','n'};

    public EncryptionDecrption(){

    }

    public static String setEncryptedString(String data) throws Exception {
        Key key = getKey();
        Cipher cipher = Cipher.getInstance(ALGO);
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encryptedValue = cipher.doFinal(data.getBytes("UTF-8"));

        return Base64.encodeToString(encryptedValue, Base64.DEFAULT);
    }

    public static String getDecryptedValue(String data) throws Exception {

        if(data != null) {
            Key key = getKey();
            Cipher cipher = Cipher.getInstance(ALGO);
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] decodebyte = Base64.decode(data.getBytes("UTF-8"), Base64.DEFAULT);
            byte[] decValue = cipher.doFinal(decodebyte);

            return new String(decValue);
        }

        return null;
    }

    private static Key getKey() throws Exception {
        return new SecretKeySpec(keyValue, ALGO);
    }
}

it works for me in Android.