java的md5的加密算法代码

Posted 2023-03-18

import java.lang.reflect.*;

/*******************************************************************************
* 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]));


参考技术A

1、为了更可靠与安全，一般都会产生一个key俗称密钥串来加密

2、准备好待加密的数据字符串text

3、将key与待加密字符串拼接处理，产生一个新的字符串str

4、将str按照一定编码处理成字节数组byte[]

5、利用md5的update方法处理字节数组获取加密后的值

用apache的实现示例：

/**
     * 签名字符串
     * @param text 需要签名的字符串
     * @param key 密钥
     * @param input_charset 编码格式
     * @return 签名结果
     */
    public static String sign(String text, String key, String input_charset) 
        text = text + key;
        return DigestUtils.md5Hex(getContentBytes(text, input_charset));
    
/**
     * @param content
     * @param charset
     * @return
     * @throws SignatureException
     * @throws UnsupportedEncodingException 
     */
    private static byte[] getContentBytes(String content, String charset) 
        if (charset == null || "".equals(charset)) 
            return content.getBytes();
        
        try 
            return content.getBytes(charset);
         catch (UnsupportedEncodingException e) 
            throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
        
    

参考技术B // Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi
// Source File Name: MD5.java

package com;

public class MD5


private long m_buf[];
private long m_bits[];
private byte m_in[];
private char HEX[] =
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f'
;

public MD5()

m_buf = new long[4];
m_bits = new long[2];
m_in = new byte[64];


/*
* 加密方法
* 调用方式：
* MD5 md = new MD5();
* String code = md.toDigest("加密参数");
* code就是加密后的密文
*/
public String toDigest(String src)

byte digest[] = toDigest(src.getBytes());
StringBuffer sb = new StringBuffer();
for(int i = 0; i < digest.length; i++)

sb.append(HEX[(digest[i] & 0xff) / 16]);
sb.append(HEX[(digest[i] & 0xff) % 16]);


return sb.toString();


public byte[] toDigest(byte src[])

byte digest[] = new byte[16];
int len = src.length;
MD5Init();
MD5Update(src, len);
MD5Final(digest);
return digest;


private void memset(byte des[], int des_offset, byte dat, int len)

for(int i = 0; i < len; i++)
des[des_offset + i] = dat;



private void memset(long des[], int des_offset, long dat, int len)

for(int i = 0; i < len; i++)
des[des_offset + i] = dat;



private void memcpy(byte des[], int des_offset, byte src[], int src_offset, int len)

for(int i = 0; i < len; i++)
des[des_offset + i] = src[src_offset + i];



private long bp2long(byte src[], int offset_lng)

long ret = 0L;
ret = (long)src[offset_lng * 4 + 0] & 255L | (long)(src[offset_lng * 4 + 1] << 8) & 65280L | (long)(src[offset_lng * 4 + 2] << 16) & 0xff0000L | (long)(src[offset_lng * 4 + 3] << 24) & 0xff000000L;
return ret & 0xffffffffL;


private void MD5Init()

m_buf[0] = 0x67452301L;
m_buf[1] = 0xefcdab89L;
m_buf[2] = 0x98badcfeL;
m_buf[3] = 0x10325476L;
m_bits[0] = 0L;
m_bits[1] = 0L;


private void MD5Update(byte buf[], int len)

long t = m_bits[0];
m_bits[0] = t + (long)(len << 3);
if(m_bits[0] < t)
m_bits[1]++;
m_bits[1] = m_bits[1] + (long)(len >> 29);
t = t >> 3 & 63L;
if(t != 0L)

long p = t;
t = (long)64 - t & 0xffffffffL;
if((long)len < t)

memcpy(m_in, (int)t, buf, 0, len);
return;

memcpy(m_in, (int)t, buf, 0, (int)t);
MD5Transform();
len = (int)((long)len - t);

for(; len >= 64; len -= 64)

memcpy(m_in, 0, buf, (int)t, 64);
MD5Transform();
t += 64;


memcpy(m_in, 0, buf, (int)t, len);


private void MD5Final(byte digest[])

long count = m_bits[0] >> 3 & 63L;
m_in[(int)count] = -128;
long p = count + (long)1;
count = (long)63 - count;
if(count < (long)8)

memset(m_in, (int)p, (byte)0, (int)count);
MD5Transform();
memset(m_in, 0, (byte)0, 56);
else

memset(m_in, (int)p, (byte)0, (int)(count - (long)8));

m_in[56] = (byte)(int)(m_bits[0] & (long)255);
m_in[57] = (byte)(int)(m_bits[0] >> 8 & (long)255);
m_in[58] = (byte)(int)(m_bits[0] >> 16 & (long)255);
m_in[59] = (byte)(int)(m_bits[0] >> 24 & (long)255);
m_in[60] = (byte)(int)(m_bits[1] & (long)255);
m_in[61] = (byte)(int)(m_bits[1] >> 8 & (long)255);
m_in[62] = (byte)(int)(m_bits[1] >> 16 & (long)255);
m_in[63] = (byte)(int)(m_bits[1] >> 24 & (long)255);
MD5Transform();
for(int i = 0; i < 4; i++)

digest[i * 4 + 0] = (byte)(int)(m_buf[i] & (long)255);
digest[i * 4 + 1] = (byte)(int)(m_buf[i] >> 8 & (long)255);
digest[i * 4 + 2] = (byte)(int)(m_buf[i] >> 16 & (long)255);
digest[i * 4 + 3] = (byte)(int)(m_buf[i] >> 24 & (long)255);


MD5Init();


private long F1(long x, long y, long z)

return (z ^ x & (y ^ z)) & 0xffffffffL;


private long F2(long x, long y, long z)

return F1(z, x, y);


private long F3(long x, long y, long z)

return (x ^ y ^ z) & 0xffffffffL;


private long F4(long x, long y, long z)

return (y ^ (x | z ^ 0L - 1L)) & 0xffffffffL;


private long MD5STEP(long w, long f, long x, long y, long z, long data, long s)

w = w + f + data & 0xffffffffL;
w = (w << (int)s | w >> (int)((long)32 - s)) & 0xffffffffL;
w = w + x & 0xffffffffL;
return w;


private void MD5Transform()

long a = m_buf[0];
long b = m_buf[1];
long c = m_buf[2];
long d = m_buf[3];
a = MD5STEP(a, F1(b, c, d), b, c, d, bp2long(m_in, 0) + 0xd76aa478L, 7L);
d = MD5STEP(d, F1(a, b, c), a, b, c, bp2long(m_in, 1) + 0xe8c7b756L, 12L);
c = MD5STEP(c, F1(d, a, b), d, a, b, bp2long(m_in, 2) + 0x242070dbL, 17L);
b = MD5STEP(b, F1(c, d, a), c, d, a, bp2long(m_in, 3) + 0xc1bdceeeL, 22L);
a = MD5STEP(a, F1(b, c, d), b, c, d, bp2long(m_in, 4) + 0xf57c0fafL, 7L);
d = MD5STEP(d, F1(a, b, c), a, b, c, bp2long(m_in, 5) + 0x4787c62aL, 12L);
c = MD5STEP(c, F1(d, a, b), d, a, b, bp2long(m_in, 6) + 0xa8304613L, 17L);
b = MD5STEP(b, F1(c, d, a), c, d, a, bp2long(m_in, 7) + 0xfd469501L, 22L);
a = MD5STEP(a, F1(b, c, d), b, c, d, bp2long(m_in, 8) + 0x698098d8L, 7L);
d = MD5STEP(d, F1(a, b, c), a, b, c, bp2long(m_in, 9) + 0x8b44f7afL, 12L);
c = MD5STEP(c, F1(d, a, b), d, a, b, bp2long(m_in, 10) + 0xffff5bb1L, 17L);
b = MD5STEP(b, F1(c, d, a), c, d, a, bp2long(m_in, 11) + 0x895cd7beL, 22L);
a = MD5STEP(a, F1(b, c, d), b, c, d, bp2long(m_in, 12) + 0x6b901122L, 7L);
d = MD5STEP(d, F1(a, b, c), a, b, c, bp2long(m_in, 13) + 0xfd987193L, 12L);
c = MD5STEP(c, F1(d, a, b), d, a, b, bp2long(m_in, 14) + 0xa679438eL, 17L);
b = MD5STEP(b, F1(c, d, a), c, d, a, bp2long(m_in, 15) + 0x49b40821L, 22L);
a = MD5STEP(a, F2(b, c, d), b, c, d, bp2long(m_in, 1) + 0xf61e2562L, 5L);
d = MD5STEP(d, F2(a, b, c), a, b, c, bp2long(m_in, 6) + 0xc040b340L, 9L);
c = MD5STEP(c, F2(d, a, b), d, a, b, bp2long(m_in, 11) + 0x265e5a51L, 14L);
b = MD5STEP(b, F2(c, d, a), c, d, a, bp2long(m_in, 0) + 0xe9b6c7aaL, 20L);
a = MD5STEP(a, F2(b, c, d), b, c, d, bp2long(m_in, 5) + 0xd62f105dL, 5L);
d = MD5STEP(d, F2(a, b, c), a, b, c, bp2long(m_in, 10) + 0x2441453L, 9L);
c = MD5STEP(c, F2(d, a, b), d, a, b, bp2long(m_in, 15) + 0xd8a1e681L, 14L);
b = MD5STEP(b, F2(c, d, a), c, d, a, bp2long(m_in, 4) + 0xe7d3fbc8L, 20L);
a = MD5STEP(a, F2(b, c, d), b, c, d, bp2long(m_in, 9) + 0x21e1cde6L, 5L);
d = MD5STEP(d, F2(a, b, c), a, b, c, bp2long(m_in, 14) + 0xc33707d6L, 9L);
c = MD5STEP(c, F2(d, a, b), d, a, b, bp2long(m_in, 3) + 0xf4d50d87L, 14L);
b = MD5STEP(b, F2(c, d, a), c, d, a, bp2long(m_in, 8) + 0x455a14edL, 20L);
a = MD5STEP(a, F2(b, c, d), b, c, d, bp2long(m_in, 13) + 0xa9e3e905L, 5L);
d = MD5STEP(d, F2(a, b, c), a, b, c, bp2long(m_in, 2) + 0xfcefa3f8L, 9L);
c = MD5STEP(c, F2(d, a, b), d, a, b, bp2long(m_in, 7) + 0x676f02d9L, 14L);
b = MD5STEP(b, F2(c, d, a), c, d, a, bp2long(m_in, 12) + 0x8d2a4c8aL, 20L);
a = MD5STEP(a, F3(b, c, d), b, c, d, bp2long(m_in, 5) + 0xfffa3942L, 4L);
d = MD5STEP(d, F3(a, b, c), a, b, c, bp2long(m_in, 8) + 0x8771f681L, 11L);
c = MD5STEP(c, F3(d, a, b), d, a, b, bp2long(m_in, 11) + 0x6d9d6122L, 16L);
b = MD5STEP(b, F3(c, d, a), c, d, a, bp2long(m_in, 14) + 0xfde5380cL, 23L);
a = MD5STEP(a, F3(b, c, d), b, c, d, bp2long(m_in, 1) + 0xa4beea44L, 4L);
d = MD5STEP(d, F3(a, b, c), a, b, c, bp2long(m_in, 4) + 0x4bdecfa9L, 11L);
c = MD5STEP(c, F3(d, a, b), d, a, b, bp2long(m_in, 7) + 0xf6bb4b60L, 16L);
b = MD5STEP(b, F3(c, d, a), c, d, a, bp2long(m_in, 10) + 0xbebfbc70L, 23L);
a = MD5STEP(a, F3(b, c, d), b, c, d, bp2long(m_in, 13) + 0x289b7ec6L, 4L);
d = MD5STEP(d, F3(a, b, c), a, b, c, bp2long(m_in, 0) + 0xeaa127faL, 11L);
c = MD5STEP(c, F3(d, a, b), d, a, b, bp2long(m_in, 3) + 0xd4ef3085L, 16L);
b = MD5STEP(b, F3(c, d, a), c, d, a, bp2long(m_in, 6) + 0x4881d05L, 23L);
a = MD5STEP(a, F3(b, c, d), b, c, d, bp2long(m_in, 9) + 0xd9d4d039L, 4L);
d = MD5STEP(d, F3(a, b, c), a, b, c, bp2long(m_in, 12) + 0xe6db99e5L, 11L);
c = MD5STEP(c, F3(d, a, b), d, a, b, bp2long(m_in, 15) + 0x1fa27cf8L, 16L);
b = MD5STEP(b, F3(c, d, a), c, d, a, bp2long(m_in, 2) + 0xc4ac5665L, 23L);
a = MD5STEP(a, F4(b, c, d), b, c, d, bp2long(m_in, 0) + 0xf4292244L, 6L);
d = MD5STEP(d, F4(a, b, c), a, b, c, bp2long(m_in, 7) + 0x432aff97L, 10L);
c = MD5STEP(c, F4(d, a, b), d, a, b, bp2long(m_in, 14) + 0xab9423a7L, 15L);
b = MD5STEP(b, F4(c, d, a), c, d, a, bp2long(m_in, 5) + 0xfc93a039L, 21L);
a = MD5STEP(a, F4(b, c, d), b, c, d, bp2long(m_in, 12) + 0x655b59c3L, 6L);
d = MD5STEP(d, F4(a, b, c), a, b, c, bp2long(m_in, 3) + 0x8f0ccc92L, 10L);
c = MD5STEP(c, F4(d, a, b), d, a, b, bp2long(m_in, 10) + 0xffeff47dL, 15L);
b = MD5STEP(b, F4(c, d, a), c, d, a, bp2long(m_in, 1) + 0x85845dd1L, 21L);
a = MD5STEP(a, F4(b, c, d), b, c, d, bp2long(m_in, 8) + 0x6fa87e4fL, 6L);
d = MD5STEP(d, F4(a, b, c), a, b, c, bp2long(m_in, 15) + 0xfe2ce6e0L, 10L);
c = MD5STEP(c, F4(d, a, b), d, a, b, bp2long(m_in, 6) + 0xa3014314L, 15L);
b = MD5STEP(b, F4(c, d, a), c, d, a, bp2long(m_in, 13) + 0x4e0811a1L, 21L);
a = MD5STEP(a, F4(b, c, d), b, c, d, bp2long(m_in, 4) + 0xf7537e82L, 6L);
d = MD5STEP(d, F4(a, b, c), a, b, c, bp2long(m_in, 11) + 0xbd3af235L, 10L);
c = MD5STEP(c, F4(d, a, b), d, a, b, bp2long(m_in, 2) + 0x2ad7d2bbL, 15L);
b = MD5STEP(b, F4(c, d, a), c, d, a, bp2long(m_in, 9) + 0xeb86d391L, 21L);
m_buf[0] += a;
m_buf[1] += b;
m_buf[2] += c;
m_buf[3] += d;

MD5加密算法Java代码

原文：http://www.open-open.com/code/view/1428398234916

 

    import java.security.MessageDigest;  
    import java.security.NoSuchAlgorithmException;  
      
    public class MD5Utils {  
          
        /** 
         * md5加密方法 
         * @param password 
         * @return 
         */  
        public static String md5Password(String password) {  
      
            try {  
                // 得到一个信息摘要器  
                MessageDigest digest = MessageDigest.getInstance("md5");  
                byte[] result = digest.digest(password.getBytes());  
                StringBuffer buffer = new StringBuffer();  
                // 把没一个byte 做一个与运算 0xff;  
                for (byte b : result) {  
                    // 与运算  
                    int number = b & 0xff;// 加盐  
                    String str = Integer.toHexString(number);  
                    // System.out.println(str);  
                    if (str.length() == 1) {  
                        buffer.append("0");  
                    }  
                    buffer.append(str);  
                }  
      
                // 标准的md5加密后的结果  
                return buffer.toString();  
            } catch (NoSuchAlgorithmException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
                return "";  
            }  
      
        }  
      
    }