md5.txt

MD5算法的Java版

/**
 * Md5.java
 * $Id: Md5.java,v 1.4 1999/12/06 13:13:58 ylafon Exp $
 * (c) COPYRIGHT MIT and INRIA, 1996.
 * Please first read the full copyright statement in file COPYRIGHT.html
 *  modified by nizhi 2001/02/15 
 *  Add model hmac_Md5 ( String text , String key ) ;
 */
import java.io.* ;

public class Md5 {
    private static final int BUFFER_SIZE = 1024;	//缓冲区的大小

    private static final int S11 = 7 ;
    private static final int S12 = 12 ;
    private static final int S13 = 17 ;
    private static final int S14 = 22 ;
    private static final int S21 = 5 ;
    private static final int S22 = 9 ;
    private static final int S23 = 14 ;
    private static final int S24 = 20 ;
    private static final int S31 = 4 ;
    private static final int S32 = 11 ;
    private static final int S33 = 16 ;
    private static final int S34 = 23 ;
    private static final int S41 = 6 ;
    private static final int S42 = 10 ;
    private static final int S43 = 15 ;
    private static final int S44 = 21 ;

    private static byte padding[] = {//64
	(byte) 0x80, (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0, 	  (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0, (byte) 0, (byte) 0,
	(byte) 0,    (byte) 0, (byte) 0, (byte) 0
    																};

    private InputStream in       = null ;
    private boolean     stringp  = false ;
    private int         state[]  = null ;
    private long        count    = 0 ;
    private byte        buffer[] = null ;		//缓冲区
    private byte        digest[] = null ;		//摘要

    
    private final int F(int x, int y, int z) {
    	return ((x & y) | ((~x) & z)) ;
    }

    private final int G(int x, int y, int z) {
    	return ((x & z) | (y & (~z))) ;
    }

    private final int H(int x, int y, int z) {
    	return (x ^ y ^ z) ;
    }
    
    private final int I(int x, int y, int z) {
    	return (y ^ (x | (~z))) ;
    }
    
    private final int  rotate_left(int x, int n) {
    	return ((x << n) | (x >>> (32-n))) ;
    }

    private final int FF(int a,int b,int c,int d,int x,int s,int ac) {
    	a += (F(b, c, d) + x + ac) ;
    	a = rotate_left(a, s) ;
    	a += b ;
    	return a ;
    }

    private final int GG(int a,int b,int c,int d,int x,int s,int ac) {
    	a += (G(b, c, d) + x + ac) ;
    	a = rotate_left(a, s) ;
    	a += b ;
    	return a ;
    }

    private final int HH(int a,int b,int c,int d,int x,int s,int ac) {
    	a += (H(b, c, d) + x + ac) ;
    	a = rotate_left(a, s) ;
    	a += b ;
    	return a ;
    }

    private final int II(int a,int b,int c,int d,int x,int s,int ac) {
    	a += (I(b, c, d) + x + ac) ;
    	a = rotate_left(a, s) ;
    	a += b ;
    	return a;
    }
    
    /**
     * decode 把byte数组按顺序拆成int数组
     * @param output 输出整型数组
     * @param input 输入字节数组
     * @param off input数组的起始位置
     * @param len 转化成int型的数组长度
     */
    private final void decode (int output[], byte input[], int off, int len) {
    	int i = 0 ;
    	int j = 0 ;
    	for ( ; j < len; i++, j += 4) {
    		output[i] = (((int) (input[off+j]&0xff))
    				| (((int) (input[off+j+1] & 0xff)) << 8)
    				| (((int) (input[off+j+2] & 0xff)) << 16)
    				| (((int) (input[off+j+3] & 0xff)) << 24)) ;
    	}
    }

    private final void transform (byte block[], int offset) {
    	int a   = state[0] ;
    	int b   = state[1] ;
    	int c   = state[2] ;
    	int d   = state[3] ;
    	int x[] = new int[16] ;

    	decode (x, block, offset, 64);
    	/* Round 1 */
    	a = FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
    	d = FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
    	c = FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
    	b = FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
    	a = FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
    	d = FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
    	c = FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
    	b = FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
    	a = FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
    	d = FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
    	c = FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
    	b = FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
    	a = FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
    	d = FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
    	c = FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
	b = FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
	/* Round 2 */
	a = GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
	d = GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
	c = GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
	b = GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
	a = GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
	d = GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
	c = GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
	b = GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
	a = GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
	d = GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
	c = GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
	b = GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
	a = GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
	d = GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
	c = GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
	b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
	/* Round 3 */
	a = HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
	d = HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
	c = HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
	b = HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
	a = HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
	d = HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
	c = HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
	b = HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
	a = HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
	d = HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
	c = HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
	b = HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
	a = HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
	d = HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
	c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
	b = HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
	/* Round 4 */
	a = II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
	d = II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
	c = II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
	b = II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
	a = II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
	d = II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
	c = II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
	b = II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
	a = II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
	d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
	c = II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
	b = II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
	a = II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
	d = II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
	c = II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
	b = II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

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

    private final void update (byte input[], int len) {
    	int index = ((int) (count >> 3)) & 0x3f ;
    	count += (len << 3) ;
    	int partLen = 64 - index ;
    	int i = 0 ;
    	if ( len >= partLen ){
    		System.arraycopy (input, 0, buffer, index, partLen) ;
    		transform (buffer, 0) ;
    		for (i = partLen ; i + 63 < len ; i+= 64) 
    			transform (input, i) ;
    		index = 0 ;
    	}
    	else
    	{
    		i = 0 ;
    	}
    	System.arraycopy (input, i, buffer, index, len - i) ;
    }

    private byte[] end (){
    	byte bits[] = new byte[8] ;
    	for (int i = 0 ; i < 8 ; i++)
    		bits[i] = (byte) ( (count>>>(i*8))  &  0xff) ;
    	int index  = ((int) (count >> 3)) & 0x3f ;
    	int padlen = (index < 56) ? (56 - index) : (120 - index) ;
    	update (padding, padlen) ;
    	update (bits, 8) ;
    	return encode(state, 16) ;
    }

    /**
     * Encode the content.state array into 16 bytes array
     * 把int数组按顺序拆成byte数组
     * */
    private byte[] encode (int input[], int len) {
    	byte output[] = new byte[len];
    	int i = 0;
    	int j = 0;
    	for ( ; j < len ; i++, j+= 4) {
    		output[j]   = (byte) ((input[i]      ) & 0xff);
    		output[j+1] = (byte) ((input[i] >> 8 ) & 0xff);
    		output[j+2] = (byte) ((input[i] >> 16) & 0xff);
    		output[j+3] = (byte) ((input[i] >> 24) & 0xff);
    	}
    	return output;
    }

    
    /**
     * Get the digest for our input stream.（获取摘要）
     * This method constructs the input stream digest, and return it, as a
     * a String, following the MD5 (rfc1321) algorithm,（遵从RFC1321的MD5算法）
     * @return An instance of String, giving the message digest.
     * @exception IOException Thrown if the digestifier was unable to read the
     * input stream.
     */
    public byte[] getDigest () throws IOException{
    	//摘要已经存在
    	if ( digest != null )
    		return digest;
    	
    	byte buffer[] = new byte[BUFFER_SIZE];
    	int  got      = -1;
    	//更新
    	while ((got = in.read(buffer)) > 0 )
    		update (buffer, got);
    	//获取摘要
    	digest = end();
    	return digest;
    }

 
    /**
     * Get the digest, as a proper string.（获取字符串型的摘要）
     */
    public String getStringDigest(){
    	if ( digest == null )
    		throw new RuntimeException (this.getClass().getName()
						+ "[getStringDigest]"
						+ ": called before processing.");
    	return stringify (digest);
    }

    /**
     * stringify函数，将字节数组转化成字符串
     * @param buf[] 待转化的字节数组
     * */
    public static String stringify (byte buf[]) {
    	StringBuffer sb = new StringBuffer(2*buf.length) ;
    	for (int i = 0 ; i < buf.length; i++)
    	{
    		int h = (buf[i] & 0xf0) >> 4;
    		int l = (buf[i] & 0x0f);
    		sb.append (new Character((char)((h>9) ? 'a'+h-10 : '0'+h))) ;
    		sb.append (new Character((char)((l>9) ? 'a'+l-10 : '0'+l))) ;
    	}
    	return sb.toString();
    }
    
    
    /**
     * Get the digest, for this string digestifier.
     * This method doesn't throw any IOException, since it knows that the
     * underlying stream ws built from a String.
     */

    public byte[] processString () {
    	if (!stringp)
    		throw new RuntimeException (this.getClass().getName()
						+ "[processString]"
						+ " not a string.") ;
    	try{
    		return getDigest() ;
    	}
    	catch (IOException ex){}
    	throw new RuntimeException (this.getClass().getName()
    					+ "[processString]"
    					+ ": implementation error.") ;
    }
    

    /**
     * Construct a digestifier for the given string.
     * @param input The string to be digestified.
     * @param encoding the encoding name used (such as UTF8)
     */
    public Md5 (String input, String enc) {
    	byte bytes [] = null;
    	try {
    		bytes = input.getBytes (enc);
    	} catch(UnsupportedEncodingException e){
    		throw new RuntimeException("no "+enc+" encoding!!!");
    	}
    	
    	this.stringp = true ;
    	this.in      = new ByteArrayInputStream (bytes) ;
    	this.state   = new int[4] ;
    	this.buffer  = new byte[64] ;
    	this.count   = 0 ;
    	state[0]	  = 0x67452301;
    	state[1]	  = 0xefcdab89;
    	state[2]	  = 0x98badcfe;
    	state[3]	  = 0x10325476;
    }   

    
    /**
     * Construct a digestifier for the given string.
     * @param input The string to be digestified.
     */
    public Md5 (String input) {
    	this(input, "UTF8");
    }

    
    /**
     * Construct a digestifier for the given input stream.
     * @param in The input stream to be digestified.
     */
    public Md5 (InputStream in) {
    	this.stringp = false ;
    	this.in      = in ;
    	this.state   = new int[4] ;
    	this.buffer  = new byte[64];
    	this.count   = 0 ;
    	state[0] = 0x67452301;
    	state[1] = 0xefcdab89;
    	state[2] = 0x98badcfe;
    	state[3] = 0x10325476;
    }

    /**
     * @param text密文
     * @param key密码
     * */
     public void hmac_Md5 ( String text , String key ) throws IOException {
	byte disgest[] = new byte[16] ;
	byte output[] = new byte[32] ;

	byte k_ipad[] = new byte[64] ;
	byte k_opad[] = new byte[64] ;
	byte tk[] = new byte[16] ;
	byte key1 [] ;
	int i ;
	int text_len = text.getBytes().length;
	int key_len = key.getBytes().length; 
		key1 = key.getBytes();
		
	if ( key_len > 64 ) {
		key1 = new Md5( key ).getDigest();
		key_len = 16;
	}
		
	for ( i = 0 ; i < 64 ; i++ ) 
		k_ipad[i] = ( byte ) 0 ;
	for ( i = 0 ; i < 64 ; i++ ) 
		k_opad[i] = ( byte ) 0 ;
			
	for ( i = 0 ; i < key_len ; i++ ) {
		k_ipad[i] = ( byte ) key1[i] ;
		k_opad[i] = ( byte ) key1[i] ;	
	}
		
	for ( i = 0 ; i < 64 ; i++ ) {
		k_ipad[i] ^= 0x36 ;
		k_opad[i] ^= 0x5c ; 	
	}
		
	d5 md5 = new Md5( "" );
	md5.update( k_ipad , 64 );
	md5.update( text.getBytes() , text_len );
	digest = md5.getDigest();
	
	Md5 md51 = new Md5( "" );
	md51.update( k_opad , 64 );
	md51.update( digest , 16 );
	digest = md51.getDigest();
     }
}