适用于Commons Codec中的decodeBuffer方法的替代品

时间:2012-11-28 06:41:08

标签: java encryption base64 aes apache-commons

我有一段使用AES算法加密和解密的代码,该算法使用的是sun.misc。*包。

后来我才知道使用那些使我遵循使用Apache的Commons Codec有效的建议的包是错误的。

上一段代码如下:

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;
}



}

正如所建议的,我已经删除了sun.misc并进行了以下更改。

在Apache的commons编解码器中用Base64替换BASE64Encoder类后:

 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);
        }

我无法找到一个合适的解密替代品,因为我在线:

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

我找不到任何执行decodeBuffer(String encryptedData)工作的方法,并返回一个decodeValue的字节数组。

2 个答案:

答案 0 :(得分:4)

好的,那又怎么样?

使用apache Base64 util类与sun.misc.Base64Encoder类似。 Apache Base64类提供了许多重载方法,可以减轻字节和字符串之间的转换。

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

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

答案 1 :(得分:0)

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);
    }
}

它适用于Android。