如何修复我得到的Base64错误?

时间:2012-07-04 09:57:30

标签: java base64

在阅读了很多关于AES,JCE及其256位密钥的无限强度策略文件之后,我已经实现了这个Oracle/Sun guide

更新

我结合了sun提供的代码并创建了一个java类 AESencrp.java

/**
 *
 * @author MUDASSIR
 */

import java.security.*;
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, byte[] keyValue) throws Exception {
        Key key = generateKey(keyValue);
        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, byte[] keyValue) throws Exception {
        Key key = generateKey(keyValue);
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.DECRYPT_MODE, key);
        byte[] decodedValue = new BASE64Decoder().decodeBuffer(encryptedData);
        byte[] decValue = c.doFinal(decodedValue);
        String decryptedValue = new String(decValue);
        return decryptedValue;
    }
    private static Key generateKey(byte[] keyValue) throws Exception {
        Key key = new SecretKeySpec(keyValue, ALGO);
        return key;
}

}

这很好用,但每当我构建我的项目时,都会发出警告:“Base64encoder是一个专有软件,必须在将来的版本中删除”。

当我删除base64编码器并改为使用asHex方法时(由sun guide here提供),它给了我一个BadPadding异常。
线程“main”中的异常javax.crypto.BadPaddingException:给定最终块未正确填充

这是我没有base64编码器的代码

/**
 *
 * @author MUDASSIR
 */

import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.*;

public class AESencrp2 {

     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 asHex(byte buf[]) {
        StringBuilder strbuf = new StringBuilder(buf.length * 2);
        int i;

        for (i = 0; i < buf.length; i++) {
            if (((int) buf[i] & 0xff) < 0x10) {
                strbuf.append("0");
            }

            strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
        }

        return strbuf.toString();
    }

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

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

}

这是主要的,我尝试代码

public static void main(String args[]) throws Exception {

        byte[] keyValue = new byte[] { 'T', 'h', 'e', 'B', 'e', 's', 't',
'S', 'e', 'c', 'r','e', 't', 'K', 'e', 'y' };

        String password = "This is the data that is going to be encrypted";

        String passwordEnc = AESencrp.encrypt(password, keyValue);
        //String passwordEnc = AESencrp2.encrypt(password, keyValue);

        String passwordDec = AESencrp.decrypt(passwordEnc, keyValue);
        //String passwordDec = AESencrp.decrypt(passwordEnc, keyValue);

        System.out.println("Plain Text : " + password);
        System.out.println("Encrypted Text : " + passwordEnc);
        System.out.println("Decrypted Text : " + passwordDec);
} 

问题,

  1. 1 - 如果我使用base64编码器,它的专有。
  2. 2 - 如果使用sun提供的asHex方法,我会得到不良的填充异常。
  3. 请帮助。

1 个答案:

答案 0 :(得分:2)

您可以使用自己的Base64编码/解码例程来解决问题。