加密算法代碼java java代碼加密工具

java的md5的加密算法代碼

import java.lang.reflect.*;

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

* keyBean 類(lèi)實(shí)現(xiàn)了RSA Data Security, Inc.在提交給IETF 的RFC1321中的keyBean message-digest

* 算法。

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

public class keyBean {

* 下面這些S11-S44實(shí)際上是一個(gè)4*4的矩陣，在原始的C實(shí)現(xiàn)中是用#define 實(shí)現(xiàn)的，這里把它們實(shí)現(xiàn)成為static

* final是表示了只讀，切能在同一個(gè)進(jìn)程空間內(nèi)的多個(gè) Instance間共享

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 };

* 下面的三個(gè)成員是keyBean計(jì)算過(guò)程中用到的3個(gè)核心數(shù)據(jù)，在原始的C實(shí)現(xiàn)中被定義到keyBean_CTX結(jié)構(gòu)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的唯一一個(gè)公共成員，是最新一次計(jì)算結(jié)果的 16進(jìn)制ASCII表示.

public String digestHexStr;

* digest,是最新一次計(jì)算結(jié)果的2進(jìn)制內(nèi)部表示，表示128bit的keyBean值.

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

* getkeyBeanofStr是類(lèi)keyBean最主要的公共方法，入口參數(shù)是你想要進(jìn)行keyBean變換的字符串

* 返回的是變換完的結(jié)果，這個(gè)結(jié)果是從公共成員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;

}

// 這是keyBean這個(gè)類(lèi)的標(biāo)準(zhǔn)構(gòu)造函數(shù)，JavaBean要求有一個(gè)public的并且沒(méi)有參數(shù)的構(gòu)造函數(shù)

public keyBean() {

keyBeanInit();

return;

}

/* keyBeanInit是一個(gè)初始化函數(shù)，初始化核心變量，裝入標(biāo)準(zhǔn)的幻數(shù) */

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個(gè)基本的keyBean函數(shù)，在原始的keyBean的C實(shí)現(xiàn)中，由于它們是

* 簡(jiǎn)單的位運(yùn)算，可能出于效率的考慮把它們實(shí)現(xiàn)成了宏，在java中，我們把它們實(shí)現(xiàn)成了private方法，名字保持了原來(lái)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將調(diào)用F,G,H,I進(jìn)行近一步變換 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的主計(jì)算過(guò)程，inbuf是要變換的字節(jié)串，inputlen是長(zhǎng)度，這個(gè)

* 函數(shù)由getkeyBeanofStr調(diào)用，調(diào)用之前需要調(diào)用keyBeaninit，因此把它設(shè)計(jì)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整理和填寫(xiě)輸出結(jié)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是一個(gè)內(nèi)部使用的byte數(shù)組的塊拷貝函數(shù)，從input的inpos開(kāi)始把len長(zhǎng)度的

* 字節(jié)拷貝到output的outpos位置開(kāi)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核心變換程序，有keyBeanUpdate調(diào)用，block是分塊的原始字節(jié)

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數(shù)組按順序拆成byte數(shù)組，因?yàn)閖ava的long類(lèi)型是64bit的，只拆低32bit，以適應(yīng)原始C實(shí)現(xiàn)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數(shù)組按順序合成成long數(shù)組，因?yàn)閖ava的long類(lèi)型是64bit的，

* 只合成低32bit，高32bit清零，以適應(yīng)原始C實(shí)現(xiàn)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是我寫(xiě)的一個(gè)把byte按照不考慮正負(fù)號(hào)的原則的”升位”程序，因?yàn)閖ava沒(méi)有unsigned運(yùn)算

public static long b2iu(byte b) {

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

}

* byteHEX()，用來(lái)把一個(gè)byte類(lèi)型的數(shù)轉(zhuǎn)換成十六進(jìn)制的ASCII表示，

* 因?yàn)閖ava中的byte的toString無(wú)法實(shí)現(xiàn)這一點(diǎn)，我們又沒(méi)有C語(yǔ)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) { // 如果沒(méi)有參數(shù)，執(zhí)行標(biāo)準(zhǔn)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]));

}

如何使用JAVA實(shí)現(xiàn)對(duì)字符串的DES加密和解密

java加密字符串可以使用des加密算法，實(shí)例如下：

package test;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.security.*;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

/**

* 加密解密

* @author shy.qiu

* @since

public class CryptTest {

/**

* 進(jìn)行MD5加密

* @param info

* 要加密的信息

* @return String 加密后的字符串

public String encryptToMD5(String info) {

byte[] digesta = null;

try {

// 得到一個(gè)md5的消息摘要

MessageDigest alga = MessageDigest.getInstance("MD5");

// 添加要進(jìn)行計(jì)算摘要的信息

alga.update(info.getBytes());

// 得到該摘要

digesta = alga.digest();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

// 將摘要轉(zhuǎn)為字符串

String rs = byte2hex(digesta);

return rs;

}

/**

* 進(jìn)行SHA加密

* @param info

* 要加密的信息

* @return String 加密后的字符串

public String encryptToSHA(String info) {

byte[] digesta = null;

try {

// 得到一個(gè)SHA-1的消息摘要

MessageDigest alga = MessageDigest.getInstance("SHA-1");

// 添加要進(jìn)行計(jì)算摘要的信息

alga.update(info.getBytes());

// 得到該摘要

digesta = alga.digest();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

// 將摘要轉(zhuǎn)為字符串

String rs = byte2hex(digesta);

return rs;

}

// //////////////////////////////////////////////////////////////////////////

/**

* 創(chuàng)建密匙

* @param algorithm

* 加密算法,可用 DES,DESede,Blowfish

* @return SecretKey 秘密（對(duì)稱）密鑰

public SecretKey createSecretKey(String algorithm) {

// 聲明KeyGenerator對(duì)象

KeyGenerator keygen;

// 聲明密鑰對(duì)象

SecretKey deskey = null;

try {

// 返回生成指定算法的秘密密鑰的 KeyGenerator 對(duì)象

keygen = KeyGenerator.getInstance(algorithm);

// 生成一個(gè)密鑰

deskey = keygen.generateKey();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

// 返回密匙

return deskey;

}

/**

* 根據(jù)密匙進(jìn)行DES加密

* @param key

* 密匙

* @param info

* 要加密的信息

* @return String 加密后的信息

public String encryptToDES(SecretKey key, String info) {

// 定義加密算法,可用 DES,DESede,Blowfish

String Algorithm = "DES";

// 加密隨機(jī)數(shù)生成器 (RNG),(可以不寫(xiě))

SecureRandom sr = new SecureRandom();

// 定義要生成的密文

byte[] cipherByte = null;

try {

// 得到加密/解密器

Cipher c1 = Cipher.getInstance(Algorithm);

// 用指定的密鑰和模式初始化Cipher對(duì)象

// 參數(shù):(ENCRYPT_MODE, DECRYPT_MODE, WRAP_MODE,UNWRAP_MODE)

c1.init(Cipher.ENCRYPT_MODE, key, sr);

// 對(duì)要加密的內(nèi)容進(jìn)行編碼處理,

cipherByte = c1.doFinal(info.getBytes());

} catch (Exception e) {

e.printStackTrace();

}

// 返回密文的十六進(jìn)制形式

return byte2hex(cipherByte);

}

/**

* 根據(jù)密匙進(jìn)行DES解密

* @param key

* 密匙

* @param sInfo

* 要解密的密文

* @return String 返回解密后信息

public String decryptByDES(SecretKey key, String sInfo) {

// 定義加密算法,

String Algorithm = "DES";

// 加密隨機(jī)數(shù)生成器 (RNG)

SecureRandom sr = new SecureRandom();

byte[] cipherByte = null;

try {

// 得到加密/解密器

Cipher c1 = Cipher.getInstance(Algorithm);

// 用指定的密鑰和模式初始化Cipher對(duì)象

c1.init(Cipher.DECRYPT_MODE, key, sr);

// 對(duì)要解密的內(nèi)容進(jìn)行編碼處理

cipherByte = c1.doFinal(hex2byte(sInfo));

} catch (Exception e) {

e.printStackTrace();

}

// return byte2hex(cipherByte);

return new String(cipherByte);

}

// /////////////////////////////////////////////////////////////////////////////

/**

* 創(chuàng)建密匙組，并將公匙，私匙放入到指定文件中

* 默認(rèn)放入mykeys.bat文件中

public void createPairKey() {

try {

// 根據(jù)特定的算法一個(gè)密鑰對(duì)生成器

KeyPairGenerator keygen = KeyPairGenerator.getInstance("DSA");

// 加密隨機(jī)數(shù)生成器 (RNG)

SecureRandom random = new SecureRandom();

// 重新設(shè)置此隨機(jī)對(duì)象的種子

random.setSeed(1000);

// 使用給定的隨機(jī)源（和默認(rèn)的參數(shù)集合）初始化確定密鑰大小的密鑰對(duì)生成器

keygen.initialize(512, random);// keygen.initialize(512);

// 生成密鑰組

KeyPair keys = keygen.generateKeyPair();

// 得到公匙

PublicKey pubkey = keys.getPublic();

// 得到私匙

PrivateKey prikey = keys.getPrivate();

// 將公匙私匙寫(xiě)入到文件當(dāng)中

doObjToFile("mykeys.bat", new Object[] { prikey, pubkey });

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

/**

* 利用私匙對(duì)信息進(jìn)行簽名把簽名后的信息放入到指定的文件中

* @param info

* 要簽名的信息

* @param signfile

* 存入的文件

public void signToInfo(String info, String signfile) {

// 從文件當(dāng)中讀取私匙

PrivateKey myprikey = (PrivateKey) getObjFromFile("mykeys.bat", 1);

// 從文件中讀取公匙

PublicKey mypubkey = (PublicKey) getObjFromFile("mykeys.bat", 2);

try {

// Signature 對(duì)象可用來(lái)生成和驗(yàn)證數(shù)字簽名

Signature signet = Signature.getInstance("DSA");

// 初始化簽署簽名的私鑰

signet.initSign(myprikey);

// 更新要由字節(jié)簽名或驗(yàn)證的數(shù)據(jù)

signet.update(info.getBytes());

// 簽署或驗(yàn)證所有更新字節(jié)的簽名，返回簽名

byte[] signed = signet.sign();

// 將數(shù)字簽名,公匙,信息放入文件中

doObjToFile(signfile, new Object[] { signed, mypubkey, info });

} catch (Exception e) {

e.printStackTrace();

}

/**

* 讀取數(shù)字簽名文件根據(jù)公匙，簽名，信息驗(yàn)證信息的合法性

* @return true 驗(yàn)證成功 false 驗(yàn)證失敗

public boolean validateSign(String signfile) {

// 讀取公匙

PublicKey mypubkey = (PublicKey) getObjFromFile(signfile, 2);

// 讀取簽名

byte[] signed = (byte[]) getObjFromFile(signfile, 1);

// 讀取信息

String info = (String) getObjFromFile(signfile, 3);

try {

// 初始一個(gè)Signature對(duì)象,并用公鑰和簽名進(jìn)行驗(yàn)證

Signature signetcheck = Signature.getInstance("DSA");

// 初始化驗(yàn)證簽名的公鑰

signetcheck.initVerify(mypubkey);

// 使用指定的 byte 數(shù)組更新要簽名或驗(yàn)證的數(shù)據(jù)

signetcheck.update(info.getBytes());

System.out.println(info);

// 驗(yàn)證傳入的簽名

return signetcheck.verify(signed);

} catch (Exception e) {

e.printStackTrace();

return false;

}

/**

* 將二進(jìn)制轉(zhuǎn)化為16進(jìn)制字符串

* @param b

* 二進(jìn)制字節(jié)數(shù)組

* @return String

public 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;

}

return hs.toUpperCase();

}

/**

* 十六進(jìn)制字符串轉(zhuǎn)化為2進(jìn)制

* @param hex

* @return

public byte[] hex2byte(String hex) {

byte[] ret = new byte[8];

byte[] tmp = hex.getBytes();

for (int i = 0; i 8; i++) {

ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);

}

return ret;

}

/**

* 將兩個(gè)ASCII字符合成一個(gè)字節(jié)；如："EF"-- 0xEF

* @param src0

* byte

* @param src1

* byte

* @return byte

public static byte uniteBytes(byte src0, byte src1) {

byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 }))

.byteValue();

_b0 = (byte) (_b0 4);

byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 }))

.byteValue();

byte ret = (byte) (_b0 ^ _b1);

return ret;

}

/**

* 將指定的對(duì)象寫(xiě)入指定的文件

* @param file

* 指定寫(xiě)入的文件

* @param objs

* 要寫(xiě)入的對(duì)象

public void doObjToFile(String file, Object[] objs) {

ObjectOutputStream oos = null;

try {

FileOutputStream fos = new FileOutputStream(file);

oos = new ObjectOutputStream(fos);

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

oos.writeObject(objs[i]);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

oos.close();

} catch (IOException e) {

e.printStackTrace();

}

/**

* 返回在文件中指定位置的對(duì)象

* @param file

* 指定的文件

* @param i

* 從1開(kāi)始

* @return

public Object getObjFromFile(String file, int i) {

ObjectInputStream ois = null;

Object obj = null;

try {

FileInputStream fis = new FileInputStream(file);

ois = new ObjectInputStream(fis);

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

obj = ois.readObject();

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

ois.close();

} catch (IOException e) {

e.printStackTrace();

}

return obj;

}

/**

* 測(cè)試

* @param args

public static void main(String[] args) {

CryptTest jiami = new CryptTest();

// 執(zhí)行MD5加密"Hello world!"

System.out.println("Hello經(jīng)過(guò)MD5:" + jiami.encryptToMD5("Hello"));

// 生成一個(gè)DES算法的密匙

SecretKey key = jiami.createSecretKey("DES");

// 用密匙加密信息"Hello world!"

String str1 = jiami.encryptToDES(key, "Hello");

System.out.println("使用des加密信息Hello為:" + str1);

// 使用這個(gè)密匙解密

String str2 = jiami.decryptByDES(key, str1);

System.out.println("解密后為：" + str2);

// 創(chuàng)建公匙和私匙

jiami.createPairKey();

// 對(duì)Hello world!使用私匙進(jìn)行簽名

jiami.signToInfo("Hello", "mysign.bat");

// 利用公匙對(duì)簽名進(jìn)行驗(yàn)證。

if (jiami.validateSign("mysign.bat")) {

System.out.println("Success!");

} else {

System.out.println("Fail!");

}

java加密解密代碼

package com.cube.limail.util;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;/**

* 加密解密類(lèi)

public class Eryptogram

{

private static String Algorithm ="DES";

private String key="CB7A92E3D3491964";

//定義加密算法,可用 DES,DESede,Blowfish

static boolean debug = false ;

/**

* 構(gòu)造子注解.

public Eryptogram ()

{

} /**

* 生成密鑰

* @return byte[] 返回生成的密鑰

* @throws exception 扔出異常.

public static byte [] getSecretKey () throws Exception

{

KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );

SecretKey deskey = keygen.generateKey ();

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

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

return deskey.getEncoded ();

} /**

* 將指定的數(shù)據(jù)根據(jù)提供的密鑰進(jìn)行加密

* @param input 需要加密的數(shù)據(jù)

* @param key 密鑰

* @return byte[] 加密后的數(shù)據(jù)

* @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 ("加密前的二進(jìn)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 ("加密后的二進(jìn)串:"+byte2hex (cipherByte ));

return cipherByte ;

} /**

* 將給定的已加密的數(shù)據(jù)通過(guò)指定的密鑰進(jìn)行解密

* @param input 待解密的數(shù)據(jù)

* @param key 密鑰

* @return byte[] 解密后的數(shù)據(jù)

* @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 ("解密后的二進(jìn)串:"+byte2hex (clearByte ));

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

} return clearByte ;

} /**

* 字節(jié)碼轉(zhuǎn)換成16進(jìn)制字符串

* @param byte[] b 輸入要轉(zhuǎn)換的字節(jié)碼

* @return String 返回轉(zhuǎn)換后的16進(jìn)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 ();

}

/**

* 字符串轉(zhuǎn)成字節(jié)數(shù)組.

* @param hex 要轉(zhuǎn)化的字符串.

* @return byte[] 返回轉(zhuǎn)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;

}

/**

* 字節(jié)數(shù)組轉(zhuǎn)成字符串.

* @param String 要轉(zhuǎn)化的字符串.

* @return 返回轉(zhuǎn)化后的字節(jié)數(shù)組.

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();

}

/**

* 從數(shù)據(jù)庫(kù)中獲取密鑰.

* @param deptid 企業(yè)id.

* @return 要返回的字節(jié)數(shù)組.

* @throws Exception 可能拋出的異常.

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("密鑰:" + 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); //獲得鑰匙（字節(jié)數(shù)組）

byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //傳入密碼和鑰匙，獲得加密后的字節(jié)數(shù)組的密碼

password=Eryptogram.bytesToHexString(tmp); //將字節(jié)數(shù)組轉(zhuǎn)化為字符串，獲得加密后的字符串密碼解密與之差不多

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