加密算法java代码 java编译加密

java的md5的加密算法代码

import java.lang.reflect.*;

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/*******************************************************************************

* keyBean 类实现了RSA Data Security, Inc.在提交给IETF 的RFC1321中的keyBean message-digest

* 算法。

******************************************************************************/

public class keyBean {

/*

* 下面这些S11-S44实际上是一个4*4的矩阵，在原始的C实现中是用#define 实现的， 这里把它们实现成为static

* final是表示了只读，切能在同一个进程空间内的多个 Instance间共享

*/

static final int S11 = 7;

static final int S12 = 12;

static final int S13 = 17;

static final int S14 = 22;

static final int S21 = 5;

static final int S22 = 9;

static final int S23 = 14;

static final int S24 = 20;

static final int S31 = 4;

static final int S32 = 11;

static final int S33 = 16;

static final int S34 = 23;

static final int S41 = 6;

static final int S42 = 10;

static final int S43 = 15;

static final int S44 = 21;

static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0 };

/*

* 下面的三个成员是keyBean计算过程中用到的3个核心数据，在原始的C实现中 被定义到keyBean_CTX结构中

*/

private long[] state = new long[4]; // state (ABCD)

private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb

// first)

private byte[] buffer = new byte[64]; // input buffer

/*

* digestHexStr是keyBean的唯一一个公共成员，是最新一次计算结果的 16进制ASCII表示.

*/

public String digestHexStr;

/*

* digest,是最新一次计算结果的2进制内部表示，表示128bit的keyBean值.

*/

private byte[] digest = new byte[16];

/*

* getkeyBeanofStr是类keyBean最主要的公共方法，入口参数是你想要进行keyBean变换的字符串

* 返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．

*/

public String getkeyBeanofStr(String inbuf) {

keyBeanInit();

keyBeanUpdate(inbuf.getBytes(), inbuf.length());

keyBeanFinal();

digestHexStr = "";

for (int i = 0; i 16; i++) {

digestHexStr += byteHEX(digest[i]);

}

return digestHexStr;

}

// 这是keyBean这个类的标准构造函数，JavaBean要求有一个public的并且没有参数的构造函数

public keyBean() {

keyBeanInit();

return;

}

/* keyBeanInit是一个初始化函数，初始化核心变量，装入标准的幻数 */

private void keyBeanInit() {

count[0] = 0L;

count[1] = 0L;

// /* Load magic initialization constants.

state[0] = 0x67452301L;

state[1] = 0xefcdab89L;

state[2] = 0x98badcfeL;

state[3] = 0x10325476L;

return;

}

/*

* F, G, H ,I 是4个基本的keyBean函数，在原始的keyBean的C实现中，由于它们是

* 简单的位运算，可能出于效率的考虑把它们实现成了宏，在java中，我们把它们 实现成了private方法，名字保持了原来C中的。

*/

private long F(long x, long y, long z) {

return (x y) | ((~x) z);

}

private long G(long x, long y, long z) {

return (x z) | (y (~z));

}

private long H(long x, long y, long z) {

return x ^ y ^ z;

}

private long I(long x, long y, long z) {

return y ^ (x | (~z));

}

/*

* FF,GG,HH和II将调用F,G,H,I进行近一步变换 FF, GG, HH, and II transformations for

* rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent

* recomputation.

*/

private long FF(long a, long b, long c, long d, long x, long s, long ac) {

a += F(b, c, d) + x + ac;

a = ((int) a s) | ((int) a (32 - s));

a += b;

return a;

}

private long GG(long a, long b, long c, long d, long x, long s, long ac) {

a += G(b, c, d) + x + ac;

a = ((int) a s) | ((int) a (32 - s));

a += b;

return a;

}

private long HH(long a, long b, long c, long d, long x, long s, long ac) {

a += H(b, c, d) + x + ac;

a = ((int) a s) | ((int) a (32 - s));

a += b;

return a;

}

private long II(long a, long b, long c, long d, long x, long s, long ac) {

a += I(b, c, d) + x + ac;

a = ((int) a s) | ((int) a (32 - s));

a += b;

return a;

}

/*

* keyBeanUpdate是keyBean的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个

* 函数由getkeyBeanofStr调用，调用之前需要调用keyBeaninit，因此把它设计成private的

*/

private void keyBeanUpdate(byte[] inbuf, int inputLen) {

int i, index, partLen;

byte[] block = new byte[64];

index = (int) (count[0] 3) 0x3F;

// /* Update number of bits */

if ((count[0] += (inputLen 3)) (inputLen 3))

count[1]++;

count[1] += (inputLen 29);

partLen = 64 - index;

// Transform as many times as possible.

if (inputLen = partLen) {

keyBeanMemcpy(buffer, inbuf, index, 0, partLen);

keyBeanTransform(buffer);

for (i = partLen; i + 63 inputLen; i += 64) {

keyBeanMemcpy(block, inbuf, 0, i, 64);

keyBeanTransform(block);

}

index = 0;

} else

i = 0;

// /* Buffer remaining input */

keyBeanMemcpy(buffer, inbuf, index, i, inputLen - i);

}

/*

* keyBeanFinal整理和填写输出结果

*/

private void keyBeanFinal() {

byte[] bits = new byte[8];

int index, padLen;

// /* Save number of bits */

Encode(bits, count, 8);

// /* Pad out to 56 mod 64.

index = (int) (count[0] 3) 0x3f;

padLen = (index 56) ? (56 - index) : (120 - index);

keyBeanUpdate(PADDING, padLen);

// /* Append length (before padding) */

keyBeanUpdate(bits, 8);

// /* Store state in digest */

Encode(digest, state, 16);

}

/*

* keyBeanMemcpy是一个内部使用的byte数组的块拷贝函数，从input的inpos开始把len长度的

* 字节拷贝到output的outpos位置开始

*/

private void keyBeanMemcpy(byte[] output, byte[] input, int outpos,

int inpos, int len) {

int i;

for (i = 0; i len; i++)

output[outpos + i] = input[inpos + i];

}

/*

* keyBeanTransform是keyBean核心变换程序，有keyBeanUpdate调用，block是分块的原始字节

*/

private void keyBeanTransform(byte block[]) {

long a = state[0], b = state[1], c = state[2], d = state[3];

long[] x = new long[16];

Decode(x, block, 64);

/* Round 1 */

a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */

d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */

c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */

b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */

a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */

d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */

c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */

b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */

a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */

d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */

c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */

b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */

a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */

d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */

c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */

b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

/* Round 2 */

a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */

d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */

c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */

b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */

a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */

d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */

c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */

b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */

a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */

d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */

c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */

b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */

a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */

d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */

c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */

b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

/* Round 3 */

a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */

d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */

c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */

b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */

a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */

d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */

c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */

b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */

a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */

d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */

c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */

b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */

a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */

d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */

c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */

b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

/* Round 4 */

a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */

d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */

c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */

b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */

a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */

d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */

c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */

b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */

a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */

d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */

c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */

b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */

a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */

d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */

c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */

b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

state[0] += a;

state[1] += b;

state[2] += c;

state[3] += d;

}

/*

* Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的， 只拆低32bit，以适应原始C实现的用途

*/

private void Encode(byte[] output, long[] input, int len) {

int i, j;

for (i = 0, j = 0; j len; i++, j += 4) {

output[j] = (byte) (input[i] 0xffL);

output[j + 1] = (byte) ((input[i] 8) 0xffL);

output[j + 2] = (byte) ((input[i] 16) 0xffL);

output[j + 3] = (byte) ((input[i] 24) 0xffL);

}

}

/*

* Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的，

* 只合成低32bit，高32bit清零，以适应原始C实现的用途

*/

private void Decode(long[] output, byte[] input, int len) {

int i, j;

for (i = 0, j = 0; j len; i++, j += 4)

output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) 8)

| (b2iu(input[j + 2]) 16) | (b2iu(input[j + 3]) 24);

return;

}

/*

* b2iu是我写的一个把byte按照不考虑正负号的原则的”升位”程序，因为java没有unsigned运算

*/

public static long b2iu(byte b) {

return b 0 ? b 0x7F + 128 : b;

}

/*

* byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，

* 因为java中的byte的toString无法实现这一点，我们又没有C语言中的 sprintf(outbuf,"%02X",ib)

*/

public static String byteHEX(byte ib) {

char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',

'B', 'C', 'D', 'E', 'F' };

char[] ob = new char[2];

ob[0] = Digit[(ib 4) 0X0F];

ob[1] = Digit[ib 0X0F];

String s = new String(ob);

return s;

}

public static void main(String args[]) {

keyBean m = new keyBean();

if (Array.getLength(args) == 0) { // 如果没有参数，执行标准的Test Suite

System.out.println("keyBean Test suite:");

System.out.println("keyBean(\"):" + m.getkeyBeanofStr(""));

System.out.println("keyBean(\"a\"):" + m.getkeyBeanofStr("a"));

System.out.println("keyBean(\"abc\"):" + m.getkeyBeanofStr("abc"));

System.out.println("keyBean(\"message digest\"):"

+ m.getkeyBeanofStr("message digest"));

System.out.println("keyBean(\"abcdefghijklmnopqrstuvwxyz\"):"

+ m.getkeyBeanofStr("abcdefghijklmnopqrstuvwxyz"));

System.out

.println("keyBean(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"

+ m

.getkeyBeanofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));

} else

System.out.println("keyBean(" + args[0] + ")="

+ m.getkeyBeanofStr(args[0]));

}

}

求java加密源代码（MD5，base64）

import java.security.*;

import javax.crypto.*;

/**

* 本例解释如何利用DES私钥加密算法加解密

*

* @author Devon

* @version 1.0 04/03/10

*/

public class SingleKeyExample {

public static void main(String[] args) {

try {

String algorithm = "DES"; //定义加密算法,可用 DES,DESede,Blowfish

String message = "Hello World. 这是待加密的信息";

// 生成个DES密钥

KeyGenerator keyGenerator = KeyGenerator.getInstance(algorithm);

keyGenerator.init(56); //选择DES算法,密钥长度必须为56位

Key key = keyGenerator.generateKey(); //生成密钥

// 生成Cipher对象

Cipher cipher = Cipher.getInstance("DES");

//用密钥加密明文(message),生成密文(cipherText)

cipher.init(Cipher.ENCRYPT_MODE, key); //操作模式为加密(Cipher.ENCRYPT_MODE),key为密钥

byte[] cipherText = cipher.doFinal(message.getBytes()); //得到加密后的字节数组

System.out.println("加密后的信息: " + new String(cipherText));

//用密钥加密明文(plainText),生成密文(cipherByte)

cipher.init(Cipher.DECRYPT_MODE, key); //操作模式为解密,key为密钥

byte[] sourceText = cipher.doFinal(cipherText); //获得解密后字节数组

System.out.println("解密后的信息: " + new String(sourceText));

} catch (Exception ex) {

ex.printStackTrace();

}

}

}

/**

* @author Devon

*/

import java.security.*;

import java.security.spec.*;

import javax.crypto.*;

public class PairKeyExample {

public static void main(String argv[]) {

try {

String algorithm = "RSA"; //定义加密算法,可用 DES,DESede,Blowfish

String message = "张三，你好，我是李四";

//产生张三的密钥对(keyPairZhang)

KeyPairGenerator keyGeneratorZhang =

KeyPairGenerator.getInstance(algorithm); //指定采用的算法

keyGeneratorZhang.initialize(1024); //指定密钥长度为1024位

KeyPair keyPairZhang = keyGeneratorZhang.generateKeyPair(); //产生密钥对

System.out.println("生成张三的公钥对");

// 张三生成公钥(publicKeyZhang)并发送给李四,这里发送的是公钥的数组字节

byte[] publicKeyZhangEncode = keyPairZhang.getPublic().getEncoded();

//通过网络或磁盘等方式,把公钥编码传送给李四

//李四接收到张三编码后的公钥,将其解码

KeyFactory keyFacoryLi = KeyFactory.getInstance(algorithm); //得到KeyFactory对象

X509EncodedKeySpec x509KeySpec =

new X509EncodedKeySpec(publicKeyZhangEncode); //公钥采用X.509编码

PublicKey publicKeyZhang = keyFacoryLi.generatePublic(x509KeySpec); //将公钥的KeySpec对象转换为公钥

System.out.println("李四成功解码,得到张三的公钥");

//李四用张三的公钥加密信息，并发送给李四

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); //得到Cipher对象

cipher.init(Cipher.ENCRYPT_MODE, publicKeyZhang); //用张三的公钥初始化Cipher对象

byte[] cipherMessage = cipher.doFinal(message.getBytes()); //得到加密信息

System.out.println("加密后信息：" + new String(cipherMessage));

System.out.println("加密完成，发送给李四...");

//张三用自己的私钥解密从李四处收到的信息

cipher.init(Cipher.DECRYPT_MODE, keyPairZhang.getPrivate()); //张三用其私钥初始化Cipher对象

byte[] originalMessage = cipher.doFinal(cipherMessage); //得到解密后信息

System.out.println("张三收到信息，解密后为：" + new String(originalMessage));

} catch (Exception ex) {

ex.printStackTrace();

}

}

}

java加密解密代码

package com.cube.limail.util;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;/**

* 加密解密类

*/

public class Eryptogram

{

private static String Algorithm ="DES";

private String key="CB7A92E3D3491964";

//定义 加密算法,可用 DES,DESede,Blowfish

static boolean debug = false ;

/**

* 构造子注解.

*/

public Eryptogram ()

{

} /**

* 生成密钥

* @return byte[] 返回生成的密钥

* @throws exception 扔出异常.

*/

public static byte [] getSecretKey () throws Exception

{

KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );

SecretKey deskey = keygen.generateKey ();

System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));

if (debug ) System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));

return deskey.getEncoded ();

} /**

* 将指定的数据根据提供的密钥进行加密

* @param input 需要加密的数据

* @param key 密钥

* @return byte[] 加密后的数据

* @throws Exception

*/

public static byte [] encryptData (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 ;

} /**

* 将给定的已加密的数据通过指定的密钥进行解密

* @param input 待解密的数据

* @param key 密钥

* @return byte[] 解密后的数据

* @throws Exception

*/

public static byte [] decryptData (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 ;

} /**

* 字节码转换成16进制字符串

* @param byte[] b 输入要转换的字节码

* @return String 返回转换后的16进制字符串

*/

public static String byte2hex (byte [] b )

{

String hs ="";

String stmp ="";

for (int n =0 ;n b.length ;n ++)

{

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

if (stmp.length ()==1 ) hs =hs +"0"+stmp ;

else hs =hs +stmp ;

if (n b.length -1 ) hs =hs +":";

} return hs.toUpperCase ();

}

/**

* 字符串转成字节数组.

* @param hex 要转化的字符串.

* @return byte[] 返回转化后的字符串.

*/

public static byte[] hexStringToByte(String hex) {

int len = (hex.length() / 2);

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

for (int i = 0; i len; i++) {

int pos = i * 2;

result[i] = (byte) (toByte(achar[pos]) 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

/**

* 字节数组转成字符串.

* @param String 要转化的字符串.

* @return 返回转化后的字节数组.

*/

public static final String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i bArray.length; i++) {

sTemp = Integer.toHexString(0xFF bArray[i]);

if (sTemp.length() 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/**

* 从数据库中获取密钥.

* @param deptid 企业id.

* @return 要返回的字节数组.

* @throws Exception 可能抛出的异常.

*/

public static byte[] getSecretKey(long deptid) throws Exception {

byte[] key=null;

String value=null;

//CommDao dao=new CommDao();

// List list=dao.getRecordList("from Key k where k.deptid="+deptid);

//if(list.size()0){

//value=((com.csc.sale.bean.Key)list.get(0)).getKey();

value = "CB7A92E3D3491964";

key=hexStringToByte(value);

//}

if (debug)

System.out.println("密钥:" + value);

return key;

}

public String encryptData2(String data) {

String en = null;

try {

byte[] key=hexStringToByte(this.key);

en = bytesToHexString(encryptData(data.getBytes(),key));

} catch (Exception e) {

e.printStackTrace();

}

return en;

}

public String decryptData2(String data) {

String de = null;

try {

byte[] key=hexStringToByte(this.key);

de = new String(decryptData(hexStringToByte(data),key));

} catch (Exception e) {

e.printStackTrace();

}

return de;

}

} 加密使用： byte[] key=Eryptogram.getSecretKey(deptid); //获得钥匙（字节数组）

byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //传入密码和钥匙，获得加密后的字节数组的密码

password=Eryptogram.bytesToHexString(tmp); //将字节数组转化为字符串，获得加密后的字符串密码解密与之差不多

DES加密算法 java实现

/*

* DesEncrypt.java

*

* Created on 2007-9-20, 16:10:47

*

* To change this template, choose Tools | Template Manager

* and open the template in the editor.

*/

//思路： 因为 任意一个字符串，都是由若干字节表示的，每个字节实质就是一个

// 有8位的进进制数，

// 又因为 一个8位二进制数，可用两位16进制字符串表示.

// 因此 任意一个字符串可以由两位16进制字符串表示。

// 而 DES是对8位二进制数进行加密，解密。

// 所以 用DES加密解密时，可以把加密所得的8位进进制数，转成

// 两位16进制数进行保存，传输。

// 具体方法：1 把一个字符串转成8位二进制数，用DES加密，得到8位二进制数的

// 密文

// 2 然后把（由1）所得的密文转成两位十六进制字符串

// 3 解密时，把（由2)所得的两位十六进制字符串，转换成8位二进制

// 数的密文

// 4 把子3所得的密文，用DES进行解密，得到8位二进制数形式的明文，

// 并强制转换成字符串。

// 思考：为什么要通过两位16进制数字符串保存密文呢？

// 原因是：一个字符串加密后所得的8位二进制数，通常不再时字符串了，如果

// 直接把这种密文所得的8位二进制数强制转成字符串，有许多信息因为异

// 常而丢失，导制解密失败。因制要把这个8位二制数，直接以数的形式

// 保存下来，而通常是用两位十六进制数表示。

package frelationmainten;

import java.security.Key;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

/**

*

* 使用DES加密与解密,可对byte[],String类型进行加密与解密

* 密文可使用String,byte[]存储.

*

* 方法:

* void getKey(String strKey)从strKey的字条生成一个Key

*

* String getEncString(String strMing)对strMing进行加密,返回String密文

* String getDesString(String strMi)对strMin进行解密,返回String明文

*

*byte[] getEncCode(byte[] byteS)byte[]型的加密

*byte[] getDesCode(byte[] byteD)byte[]型的解密

*/

public class DesEncrypt {

Key key;

/**

* 根据参数生成KEY

* @param strKey

*/

public void getKey(String strKey) {

try{

KeyGenerator _generator = KeyGenerator.getInstance("DES");

_generator.init(new SecureRandom(strKey.getBytes()));

this.key = _generator.generateKey();

_generator=null;

}catch(Exception e){

e.printStackTrace();

}

}

/**

* 加密String明文输入,String密文输出

* @param strMing

* @return

*/

public String getEncString(String strMing) {

byte[] byteMi = null;

byte[] byteMing = null;

String strMi = "";

try {

return byte2hex(getEncCode (strMing.getBytes() ) );

// byteMing = strMing.getBytes("UTF8");

// byteMi = this.getEncCode(byteMing);

// strMi = new String( byteMi,"UTF8");

}

catch(Exception e){

e.printStackTrace();

}

finally {

byteMing = null;

byteMi = null;

}

return strMi;

}

/**

* 解密 以String密文输入,String明文输出

* @param strMi

* @return

*/

public String getDesString(String strMi) {

byte[] byteMing = null;

byte[] byteMi = null;

String strMing = "";

try {

return new String(getDesCode(hex2byte(strMi.getBytes()) ));

// byteMing = this.getDesCode(byteMi);

// strMing = new String(byteMing,"UTF8");

}

catch(Exception e) {

e.printStackTrace();

}

finally {

byteMing = null;

byteMi = null;

}

return strMing;

}

/**

* 加密以byte[]明文输入,byte[]密文输出

* @param byteS

* @return

*/

private byte[] getEncCode(byte[] byteS) {

byte[] byteFina = null;

Cipher cipher;

try {

cipher = Cipher.getInstance("DES");

cipher.init(Cipher.ENCRYPT_MODE, key);

byteFina = cipher.doFinal(byteS);

}

catch(Exception e) {

e.printStackTrace();

}

finally {

cipher = null;

}

return byteFina;

}

/**

* 解密以byte[]密文输入,以byte[]明文输出

* @param byteD

* @return

*/

private byte[] getDesCode(byte[] byteD) {

Cipher cipher;

byte[] byteFina=null;

try{

cipher = Cipher.getInstance("DES");

cipher.init(Cipher.DECRYPT_MODE, key);

byteFina = cipher.doFinal(byteD);

}catch(Exception e){

e.printStackTrace();

}finally{

cipher=null;

}

return byteFina;

}

/**

* 二行制转字符串

* @param b

* @return

*/

public static String byte2hex(byte[] b) { //一个字节的数，

// 转成16进制字符串

String hs = "";

String stmp = "";

for (int n = 0; n b.length; n++) {

//整数转成十六进制表示

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

if (stmp.length() == 1)

hs = hs + "0" + stmp;

else

hs = hs + stmp;

}

return hs.toUpperCase(); //转成大写

}

public static byte[] hex2byte(byte[] b) {

if((b.length%2)!=0)

throw new IllegalArgumentException("长度不是偶数");

byte[] b2 = new byte[b.length/2];

for (int n = 0; n b.length; n+=2) {

String item = new String(b,n,2);

// 两位一组，表示一个字节,把这样表示的16进制字符串，还原成一个进制字节

b2[n/2] = (byte)Integer.parseInt(item,16);

}

return b2;

}

public static void main(String[] args){

System.out.println("hello");

DesEncrypt des=new DesEncrypt();//实例化一个对像

des.getKey("aadd");//生成密匙

String strEnc = des.getEncString("云海飞舞云122");//加密字符串,返回String的密文

System.out.println(strEnc);

String strDes = des.getDesString(strEnc);//把String 类型的密文解密

System.out.println(strDes);

new DesEncrypt();

}

}

用java实现DES加密算法，细致点，要直接粘贴进平台能运行的！！

/*des密钥生成代码*/

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectOutputStream;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import java.security.spec.InvalidKeySpecException;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import com.huateng.util.common.Log;

public class GenKey {

private static final String DES = "DES";

public static final String SKEY_NAME = "key.des";

public static void genKey1(String path) {

// 密钥

SecretKey skey = null;

// 密钥随机数生成

SecureRandom sr = new SecureRandom();

//生成密钥文件

File file = genFile(path);

try {

// 获取密钥生成实例

KeyGenerator gen = KeyGenerator.getInstance(DES);

// 初始化密钥生成器

gen.init(sr);

// 生成密钥

skey = gen.generateKey();

// System.out.println(skey);

ObjectOutputStream oos = new ObjectOutputStream(

new FileOutputStream(file));

oos.writeObject(skey);

oos.close();

Log.sKeyPath(path);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* @param file ： 生成密钥的路径

* SecretKeyFactory 方式生成des密钥

* */

public static void genKey2(String path) {

// 密钥随机数生成

SecureRandom sr = new SecureRandom();

// byte[] bytes = {11,12,44,99,76,45,1,8};

byte[] bytes = sr.generateSeed(20);

// 密钥

SecretKey skey = null;

//生成密钥文件路径

File file = genFile(path);

try {

//创建deskeyspec对象

DESKeySpec desKeySpec = new DESKeySpec(bytes,9);

//实例化des密钥工厂

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

//生成密钥对象

skey = keyFactory.generateSecret(desKeySpec);

//写出密钥对象

ObjectOutputStream oos = new ObjectOutputStream(

new FileOutputStream(file));

oos.writeObject(skey);

oos.close();

Log.sKeyPath(path);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (InvalidKeySpecException e) {

e.printStackTrace();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

private static File genFile(String path) {

String temp = null;

File newFile = null;

if (path.endsWith("/") || path.endsWith("\\")) {

temp = path;

} else {

temp = path + "/";

}

File pathFile = new File(temp);

if (!pathFile.exists())

pathFile.mkdirs();

newFile = new File(temp+SKEY_NAME);

return newFile;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

genKey2("E:/a/aa/");

}

}

/*加解密*/

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import javax.crypto.Cipher;

import javax.crypto.CipherInputStream;

import javax.crypto.SecretKey;

public class SecUtil {

public static void decrypt(String keyPath, String source, String dest) {

SecretKey key = null;

try

{

ObjectInputStream keyFile = new ObjectInputStream(

//读取加密密钥

new FileInputStream(keyPath));

key = (SecretKey) keyFile.readObject();

keyFile.close();

}

catch (FileNotFoundException ey1) {

throw new RuntimeException(ey1);

}

catch (Exception ey2) {

throw new RuntimeException(ey2);

}

//用key产生Cipher

Cipher cipher = null;

try {

//设置算法,应该与加密时的设置一样

cipher = Cipher.getInstance("DES");

//设置解密模式

cipher.init(Cipher.DECRYPT_MODE, key);

}

catch (Exception ey3) {

throw new RuntimeException(ey3);

}

//取得要解密的文件并解密

File file = new File(source);

String filename = file.getName();

try {

//输出流,请注意文件名称的获取

BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));

//输入流

CipherInputStream in = new CipherInputStream(new BufferedInputStream(

new FileInputStream(file)), cipher);

int thebyte = 0;

while ( (thebyte = in.read()) != -1) {

out.write(thebyte);

}

in.close();

out.close();

}

catch (Exception ey5) {

throw new RuntimeException(ey5);

}

}

public static void encrypt(String keyPath, String source, String dest) {

SecretKey key = null;

try

{

ObjectInputStream keyFile = new ObjectInputStream(

//读取加密密钥

new FileInputStream(keyPath));

key = (SecretKey) keyFile.readObject();

keyFile.close();

}

catch (FileNotFoundException ey1) {

throw new RuntimeException(ey1);

}

catch (Exception ey2) {

throw new RuntimeException(ey2);

}

//用key产生Cipher

Cipher cipher = null;

try {

//设置算法,应该与加密时的设置一样

cipher = Cipher.getInstance("DES");

//设置解密模式

cipher.init(Cipher.ENCRYPT_MODE, key);

}

catch (Exception ey3) {

throw new RuntimeException(ey3);

}

//取得要解密的文件并解密

File file = new File(source);

String filename = file.getName();

try {

//输出流,请注意文件名称的获取

BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));

//输入流

CipherInputStream in = new CipherInputStream(new BufferedInputStream(

new FileInputStream(file)), cipher);

int thebyte = 0;

while ( (thebyte = in.read()) != -1) {

out.write(thebyte);

}

in.close();

out.close();

}

catch (Exception ey5) {

throw new RuntimeException(ey5);

}

}

}