java中decode加密_月光软件站 – 编程文档 – Java – 简单加密/解密方法包装, 含encode(),decode(),md5()…

package steeven;

/*

用途: 简单加密/解密方法包装

作者: steeven@kali.com.cn

日期: 12/05/2001

感谢: http://www-900.ibm.com/developerWorks/java/l-security/index.shtml

说明:

This Class need JCE, download here:

http://java.sun.com/security/index.html

*/

import java.security.*;

import javax.crypto.*;

public class Crypt {

private static String Algorithm=”DES”; //定义 加密算法,可用 DES,DESede,Blowfish

static boolean debug = false;

static{

Security.addProvider(new com.sun.crypto.provider.SunJCE());

}

//生成密钥, 注意此步骤时间比较长

public static byte[] getKey() throws Exception{

KeyGenerator keygen = KeyGenerator.getInstance(Algorithm);

SecretKey deskey = keygen.generateKey();

if (debug)

System.out.println(“生成密钥:”+byte2hex(deskey.getEncoded()));

return deskey.getEncoded();

}

//加密

public static byte[] encode(byte[] input,byte[] key) throws Exception{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key,Algorithm);

if (debug){

System.out.println(“加密前的二进串:”+byte2hex(input));

System.out.println(“加密前的字符串:”+new String(input));

}

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.ENCRYPT_MODE,deskey);

byte[] cipherByte=c1.doFinal(input);

if (debug)

System.out.println(“加密后的二进串:”+byte2hex(cipherByte));

return cipherByte;

}

//解密

public static byte[] decode(byte[] input,byte[] key) throws Exception{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key,Algorithm);

if (debug)

System.out.println(“解密前的信息:”+byte2hex(input));

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.DECRYPT_MODE,deskey);

byte[] clearByte=c1.doFinal(input);

if (debug){

System.out.println(“解密后的二进串:”+byte2hex(clearByte));

System.out.println(“解密后的字符串:”+(new String(clearByte)));

}

return clearByte;

}

//md5()信息摘要, 不可逆

public static byte[] md5(byte[] input) throws Exception{

java.security.MessageDigest alg=java.security.MessageDigest.getInstance(“MD5”); //or “SHA-1”

if (debug){

System.out.println(“摘要前的二进串:”+byte2hex(input));

System.out.println(“摘要前的字符串:”+new String(input));

}

alg.update(input);

byte[] digest = alg.digest();

if (debug)

System.out.println(“摘要后的二进串:”+byte2hex(digest));

return digest;

}

//字节码转换成16进制字符串

public static String byte2hex(byte[] b) {

String hs=””;

String stmp=””;

for (int n=0;n

stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));

if (stmp.length()==1)

hs=hs+”0″+stmp;

else hs=hs+stmp;

if (n

}

return hs.toUpperCase();

}

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

debug = true;

//    byte[] key = getKey();

byte[] key = “好好学习”.getBytes();

decode(encode(“测试加密”.getBytes(),key),key);

md5(“测试加密”.getBytes());

}

}

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