有谁给一个JAVA调用MD5的例子呀？？？

[china_why]

谢谢！

[老土豆T]

package net.wastl.webmail.misc;

/*
* $Header: /cvsroot/jwebmail/webmail/src/net/wastl/webmail/misc/MD5.java,v 1.1 2000/09/13 12:47:50 wastl Exp $
*
* MD5 in Java JDK Beta-2
* written Santeri Paavolainen, Helsinki Finland 1996
* (c) Santeri Paavolainen, Helsinki Finland 1996
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* See http://www.cs.hut.fi/~santtu/java/ for more information on this
* class.
*
* This is rather straight re-implementation of the reference implementation
* given in RFC1321 by RSA.
*
* Passes MD5 test suite as defined in RFC1321.
*
*
* This Java class has been derived from the RSA Data Security, Inc. MD5
* Message-Digest Algorithm and its reference implementation.
*
*
* $Log: MD5.java,v $
* Revision 1.1 2000/09/13 12:47:50 wastl
* *** empty log message ***
*
* Revision 1.5 1996/12/12 10:47:02 santtu
* Changed GPL to LGPL
*
* Revision 1.4 1996/12/12 10:30:02 santtu
* Some typos, State -> MD5State etc.
*
* Revision 1.3 1996/04/15 07:28:09 santtu
* Added GPL statemets, and RSA derivate stametemetsnnts.
*
* Revision 1.2 1996/03/04 08:05:48 santtu
* Added offsets to Update method
*
* Revision 1.1 1996/01/07 20:51:59 santtu
* Initial revision
*
*/

[老土豆T]

/**
* Contains internal state of the MD5 class
*/

class MD5State {
/**
* 128-byte state
*/
int state[];

/**
* 64-bit character count (could be true Java long?)
*/
int count[];

/**
* 64-byte buffer (512 bits) for storing to-be-hashed characters
*/
byte buffer[];

public MD5State() {
buffer = new byte[64];
count = new int[2];
state = new int[4];

state[0] = 0x67452301;
state[1] = 0xefcdab89;
state[2] = 0x98badcfe;
state[3] = 0x10325476;

count[0] = count[1] = 0;
}

/** Create this State as a copy of another state */
public MD5State (MD5State from) {
this();

int i;

for (i = 0; i < buffer.length; i++)
this.buffer[i] = from.buffer[i];

for (i = 0; i < state.length; i++)
this.state[i] = from.state[i];

for (i = 0; i < count.length; i++)
this.count[i] = from.count[i];
}
}

[老土豆T]

/**
* Implementation of RSA's MD5 hash generator
*
* @version $Revision: 1.1 $
* @author Santeri Paavolainen <[e-mail]>
*/

public class MD5 {
/**
* MD5 state
*/
MD5State state;

/**
* If Final() has been called, finals is set to the current finals
* state. Any Update() causes this to be set to null.
*/
MD5State finals;

/**
* Padding for Final()
*/
static byte padding[] = {
(byte) 0x80, 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
};

/**
* Initialize MD5 internal state (object can be reused just by
* calling Init() after every Final()
*/
public synchronized void Init () {
state = new MD5State();
finals = null;
}

/**
* Class constructor
*/
public MD5 () {
this.Init();
}

/**
* Initialize class, and update hash with ob.toString()
*
* @param ob Object, ob.toString() is used to update hash
* after initialization
*/
public MD5 (Object ob) {
this();
Update(ob.toString());
}

private int rotate_left (int x, int n) {
return (x << n) | (x >>> (32 - n));
}

/* I wonder how many loops and hoops you'll have to go through to
get unsigned add for longs in java */

private int uadd (int a, int b) {
long aa, bb;
aa = ((long) a) & 0xffffffffL;
bb = ((long) b) & 0xffffffffL;

aa += bb;

return (int) (aa & 0xffffffffL);
}

private int uadd (int a, int b, int c) {
return uadd(uadd(a, b), c);
}

private int uadd (int a, int b, int c, int d) {
return uadd(uadd(a, b, c), d);
}

private int FF (int a, int b, int c, int d, int x, int s, int ac) {
a = uadd(a, ((b & c) | (~b & d)), x, ac);
return uadd(rotate_left(a, s), b);
}

private int GG (int a, int b, int c, int d, int x, int s, int ac) {
a = uadd(a, ((b & d) | (c & ~d)), x, ac);
return uadd(rotate_left(a, s), b);
}

private int HH (int a, int b, int c, int d, int x, int s, int ac) {
a = uadd(a, (b ^ c ^ d), x, ac);
return uadd(rotate_left(a, s) , b);
}

private int II (int a, int b, int c, int d, int x, int s, int ac) {
a = uadd(a, (c ^ (b | ~d)), x, ac);
return uadd(rotate_left(a, s), b);
}

private int[] Decode (byte buffer[], int len, int shift) {
int out[];
int i, j;

out = new int[16];

for (i = j = 0; j < len; i++, j += 4) {
out[i] = ((int) (buffer[j + shift] & 0xff)) |
(((int) (buffer[j + 1 + shift] & 0xff)) << 8) |
(((int) (buffer[j + 2 + shift] & 0xff)) << 16) |
(((int) (buffer[j + 3 + shift] & 0xff)) << 24);

/* System.out.println("out[" + i + "] = \t" +
((int) buffer[j + 0 + shift] & 0xff) + "\t|\t" +
((int) buffer[j + 1 + shift] & 0xff) + "\t|\t" +
((int) buffer[j + 2 + shift] & 0xff) + "\t|\t" +
((int) buffer[j + 3 + shift] & 0xff));*/
}

return out;
}

private void Transform (MD5State state, byte buffer[], int shift) {
int
a = state.state[0],
b = state.state[1],
c = state.state[2],
d = state.state[3],
x[];

x = Decode(buffer, 64, shift);

/* Round 1 */
a = FF (a, b, c, d, x[ 0], 7, 0xd76aa478); /* 1 */
d = FF (d, a, b, c, x[ 1], 12, 0xe8c7b756); /* 2 */
c = FF (c, d, a, b, x[ 2], 17, 0x242070db); /* 3 */
b = FF (b, c, d, a, x[ 3], 22, 0xc1bdceee); /* 4 */
a = FF (a, b, c, d, x[ 4], 7, 0xf57c0faf); /* 5 */
d = FF (d, a, b, c, x[ 5], 12, 0x4787c62a); /* 6 */
c = FF (c, d, a, b, x[ 6], 17, 0xa8304613); /* 7 */
b = FF (b, c, d, a, x[ 7], 22, 0xfd469501); /* 8 */
a = FF (a, b, c, d, x[ 8], 7, 0x698098d8); /* 9 */
d = FF (d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */
c = FF (c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */
b = FF (b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */
a = FF (a, b, c, d, x[12], 7, 0x6b901122); /* 13 */
d = FF (d, a, b, c, x[13], 12, 0xfd987193); /* 14 */
c = FF (c, d, a, b, x[14], 17, 0xa679438e); /* 15 */
b = FF (b, c, d, a, x[15], 22, 0x49b40821); /* 16 */

/* Round 2 */
a = GG (a, b, c, d, x[ 1], 5, 0xf61e2562); /* 17 */
d = GG (d, a, b, c, x[ 6], 9, 0xc040b340); /* 18 */
c = GG (c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */
b = GG (b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /* 20 */
a = GG (a, b, c, d, x[ 5], 5, 0xd62f105d); /* 21 */
d = GG (d, a, b, c, x[10], 9, 0x2441453); /* 22 */
c = GG (c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */
b = GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /* 24 */
a = GG (a, b, c, d, x[ 9], 5, 0x21e1cde6); /* 25 */
d = GG (d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */
c = GG (c, d, a, b, x[ 3], 14, 0xf4d50d87); /* 27 */
b = GG (b, c, d, a, x[ 8], 20, 0x455a14ed); /* 28 */
a = GG (a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */
d = GG (d, a, b, c, x[ 2], 9, 0xfcefa3f8); /* 30 */
c = GG (c, d, a, b, x[ 7], 14, 0x676f02d9); /* 31 */
b = GG (b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */

/* Round 3 */
a = HH (a, b, c, d, x[ 5], 4, 0xfffa3942); /* 33 */
d = HH (d, a, b, c, x[ 8], 11, 0x8771f681); /* 34 */
c = HH (c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */
b = HH (b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */
a = HH (a, b, c, d, x[ 1], 4, 0xa4beea44); /* 37 */
d = HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9); /* 38 */
c = HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60); /* 39 */
b = HH (b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */
a = HH (a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */
d = HH (d, a, b, c, x[ 0], 11, 0xeaa127fa); /* 42 */
c = HH (c, d, a, b, x[ 3], 16, 0xd4ef3085); /* 43 */
b = HH (b, c, d, a, x[ 6], 23, 0x4881d05); /* 44 */
a = HH (a, b, c, d, x[ 9], 4, 0xd9d4d039); /* 45 */
d = HH (d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */
c = HH (c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */
b = HH (b, c, d, a, x[ 2], 23, 0xc4ac5665); /* 48 */

/* Round 4 */
a = II (a, b, c, d, x[ 0], 6, 0xf4292244); /* 49 */
d = II (d, a, b, c, x[ 7], 10, 0x432aff97); /* 50 */
c = II (c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */
b = II (b, c, d, a, x[ 5], 21, 0xfc93a039); /* 52 */
a = II (a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */
d = II (d, a, b, c, x[ 3], 10, 0x8f0ccc92); /* 54 */
c = II (c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */
b = II (b, c, d, a, x[ 1], 21, 0x85845dd1); /* 56 */
a = II (a, b, c, d, x[ 8], 6, 0x6fa87e4f); /* 57 */
d = II (d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */
c = II (c, d, a, b, x[ 6], 15, 0xa3014314); /* 59 */
b = II (b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */
a = II (a, b, c, d, x[ 4], 6, 0xf7537e82); /* 61 */
d = II (d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */
c = II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /* 63 */
b = II (b, c, d, a, x[ 9], 21, 0xeb86d391); /* 64 */

state.state[0] += a;
state.state[1] += b;
state.state[2] += c;
state.state[3] += d;
}

[china_why]

不是算法呀。。。
我要的是怎么调用MD5进行数据加密。。。。。谢谢

[qiri07]

study

[wangwh_boy]

可以去这里看一看，有完整的演示代码，绝对实用：
http://www.aslike.net

[shannon1]

使用MessageDigest
(1)
public class test
{
private static final char[] ENCODE_TABLE = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

private static String toHexString(byte[] bytes)
{
StringBuffer result = new StringBuffer();
for(int i=0; i<bytes.length; i++)
{
byte c = bytes[i];
if((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
result.append((char) c);
else
{
result.append('%');
result.append(ENCODE_TABLE[(c >> 4) & 0x0f]);
result.append(ENCODE_TABLE[c & 0x0f]);
}
}
return result.toString();
}

public static void main(String args[])
{
String info=args[0];
try
{
java.security.MessageDigest alg=java.security.MessageDigest.getInstance("MD5");
alg.update(info.getBytes());
byte[] digesta=alg.digest();
System.out.println(toHextString(digesta.toString()));
}catch(Exception e)
{
System.out.println(e);
}
}
}

(2)
/*
**进行md5加密的类
*/

public class MD5Encoder
{
public static void main(String args[])
{
String info=args[0];
try
{
java.security.MessageDigest alg=java.security.MessageDigest.getInstance("MD5");
alg.update(info.getBytes());
byte[] digesta=alg.digest();
String result="";
for(int i=0;i<digesta.length;i++)
{
int m=digesta[i];
if(m<0)
{
m+=256;//如果是负数就取模
}
if(m<16)
{
result+="0";//如果长度不够就加"0"
}
result=result+Integer.toString(m,16).toUpperCase()+"";
}
System.out.println(result);
}catch(Exception e)
{
System.out.println(e);
}
}
}