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java的md5加密類(lèi)

MD5算法是將數(shù)據(jù)進(jìn)行不可逆加密的算法有較好的安全性,在國(guó)內(nèi)如壽信的安全支付平臺(tái)就采用此算法。
源代碼如下
/************************************************
MD5 算法的Java Bean
Last Modified:10,Mar,2001
*************************************************/

import java.lang.reflect.*;

/*************************************************
md5 類(lèi)實(shí)現(xiàn)了RSA Data Security, Inc.在提交給IETF
的RFC1321中的MD5 message-digest 算法。
*************************************************/

public class MD5 {
/* 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, 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MD5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MD5_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MD5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MD5值.
*/
private byte[] digest = new byte[16];

/*
??getMD5ofStr是類(lèi)MD5最主要的公共方法,入口參數(shù)是你想要進(jìn)行MD5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 getMD5ofStr(String inbuf) {
md5Init();
md5update(inbuf.getBytes(), inbuf.length());
md5Final();
digestHexStr = "";
for (int i = 0; i < 16; i++) {
digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;

}
// 這是MD5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 MD5() {
md5Init();

return;
}

/* md5Init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 md5Init() {
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MD5函數(shù),在原始的MD5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;
}
/*
md5update是MD5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getMD5ofStr調(diào)用,調(diào)用之前需要調(diào)用md5init,因此把它設(shè)計(jì)成private的
*/
private void md5update(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) {
md5Memcpy(buffer, inbuf, index, 0, partLen);
md5Transform(buffer);

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

md5Memcpy(block, inbuf, 0, i, 64);
md5Transform (block);
}
index = 0;

} else

i = 0;

///* Buffer remaining input */
md5Memcpy(buffer, inbuf, index, i, inputLen - i);

}

/*
??md5Final整理和填寫(xiě)輸出結(jié)果
*/
private void md5Final () {
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);
md5update (PADDING, padLen);

///* Append length (before padding) */
md5update(bits, 8);

///* Store state in digest */
Encode (digest, state, 16);

}

/* md5Memcpy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 md5Memcpy (byte[] output, byte[] input,
int outpos, int inpos, int len)
{
int i;

for (i = 0; i < len; i++)
output[outpos + i] = input[inpos + i];
}

/*
???md5Transform是MD5核心變換程序,有md5update調(diào)用,block是分塊的原始字節(jié)
*/
private void md5Transform (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;
}
}

posted on 2006-09-28 14:09 圣域飛俠閱讀(4727) 評(píng)論(2) 編輯收藏

FeedBack:

# re: java的md5加密類(lèi)

2006-09-29 08:41 | 祥子

/**
* Alipay.com Inc. Copyright (c) 2004-2005 All Rights Reserved.
*
* <p>
* Created on 2005-7-9
* </p>
*/

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
* MD5加密算法
*/
public class Md5Encrypt {
/**
* 對(duì)字符串進(jìn)行MD5加密
*
* @param text 明文
*
* @return 密文
*/
public static String md5(String text) {
MessageDigest msgDigest = null;

try {
msgDigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException("System doesn't support MD5 algorithm.");
}

msgDigest.update(text.getBytes());

byte[] bytes = msgDigest.digest();

byte tb;
char low;
char high;
char tmpChar;

String md5Str = new String();

for (int i = 0; i < bytes.length; i++) {
tb = bytes[i];

tmpChar = (char) ((tb >>> 4) & 0x000f);

if (tmpChar >= 10) {
high = (char) (('a' + tmpChar) - 10);
} else {
high = (char) ('0' + tmpChar);
}

md5Str += high;
tmpChar = (char) (tb & 0x000f);

if (tmpChar >= 10) {
low = (char) (('a' + tmpChar) - 10);
} else {
low = (char) ('0' + tmpChar);
}

md5Str += low;
}

return md5Str;
}
} 回復(fù) 更多評(píng)論