Bouncy Castle实现AES-128-CBC加密解密

Bouncy Castle是一种用于Java平台的开放源码的轻量级密码术包。它支持大量的密码术算法，并提供 JCE 1.2.1 的实现。Bouncy Castle是轻量级的，从J2SE 1.4到J2ME（包括MIDP）平台，它都可以运行。它是在MIDP上运行的唯一完整的密码术包。jar包下载：http:/ /www.bouncycastle.org/download/bcprov- jdk16-139.jar代码来自：http://albertsong.iteye.com/blog/196273

AESWithJCE.java

//使用JCE的AES-128-CBC加密解密
package com.albertsong.aes;

import java.security.Key;
import java.security.Security;

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

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

/**
 * @author Albert
 * @version 1.0
 * 
 */
public class AESWithJCE {

    /**
     * @param args
     */
    public static void main(String[] args) {
        byte[] keybytes = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
                0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38 };
        byte[] iv = { 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x38,
                0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 };
        String content ="TEST1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        System.out.println("Original content:");
        System.out.println(content);
        try {
            Security.addProvider(new BouncyCastleProvider());
            Key key = new SecretKeySpec(keybytes, "AES");
            Cipher in = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
            in.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
            byte[] enc = in.doFinal(content.getBytes());
            System.out.println("Encrypted Content:");
            System.out.println(new String(Hex.encode(enc)));

            Cipher out = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
            out.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
            byte[] dec = out.doFinal(enc);
            System.out.println("Decrypted Content:");
            System.out.println(new String(dec));
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

}

AESWithoutJCE.java

//不使用JCE的AES-128-CBC加密解密，可以用于J2ME程序中。
package com.albertsong.aes;  

import org.bouncycastle.crypto.BufferedBlockCipher;  
import org.bouncycastle.crypto.engines.AESFastEngine;  
import org.bouncycastle.crypto.modes.CBCBlockCipher;  
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;  
import org.bouncycastle.crypto.params.KeyParameter;  
import org.bouncycastle.crypto.params.ParametersWithIV;  
import org.bouncycastle.util.encoders.Hex;  

/** 
* @author Albert 
* @version 1.0 
* 
*/  
public class AESWithoutJCE {  

    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        byte[] keybytes = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,  
            0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38 };  
        byte[] iv = { 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x38,  
            0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 };  
        String content ="TEST1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";  
        System.out.println("Original content:");  
        System.out.println(content);  
        try {  
        BufferedBlockCipher engine = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));  
        engine.init(true, new ParametersWithIV(new KeyParameter(keybytes),iv));  
        byte[] enc = new byte[engine.getOutputSize(content.getBytes().length)];  
        int size1 = engine.processBytes(content.getBytes(), 0, content.getBytes().length, enc, 0);  
        int size2 = engine.doFinal(enc, size1);  
        System.out.println("size2 ="+size2);  
        byte[] encryptedContent =new byte[size1+size2];  
        System.arraycopy(enc, 0, encryptedContent, 0, encryptedContent.length);  
        System.out.println("Encrypted Content:");  
        System.out.println(new String(Hex.encode(encryptedContent)));  

        engine.init(false, new ParametersWithIV(new KeyParameter(keybytes),iv));  
        byte[] dec = new byte[engine.getOutputSize(encryptedContent.length)];  
        size1 = engine.processBytes(encryptedContent, 0, encryptedContent.length, dec, 0);  
        size2 = engine.doFinal(dec, size1);  
        System.out.println("size2 ="+size2);  
        byte[] decryptedContent =new byte[size1+size2];  
        System.arraycopy(dec, 0, decryptedContent, 0, decryptedContent.length);  
        System.out.println("Decrypted Content:");  
        System.out.println(new String(decryptedContent));  

        } catch (Exception ex) {  
        ex.printStackTrace();  
        }  

    }  

}  

标签：AES,加密,算法,Bouncy,Castle