md5.cs

MD5 加密类

using System;
using System.Collections;  
using System.IO; 
using System.Collections.Generic;
using System.Text;
using System.Security;
using System.Security.Cryptography;

namespace BLL
{
    public class MD5
    {
        //public static string Encrypt(string str)
        //{
        //    byte[] bytestr = Encoding.UTF8.GetBytes(str);
        //    MD5CryptoServiceProvider myMd5 = new MD5CryptoServiceProvider();
        //    byte[] byteMd5str = myMd5.ComputeHash(bytestr);
        //    string strMd5Pwd = Encoding.Default.GetString(byteMd5str).Trim();
        //    return strMd5Pwd;
        //}

        //public static string Encrypt(string password)
        //{
        //    UnicodeEncoding ByteConverter = new UnicodeEncoding();
        //    byte[] dataToEncrypt = ByteConverter.GetBytes(password);
        //    byte[] hashedBytes = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(dataToEncrypt);
        //    return BitConverter.ToString(hashedBytes);
        //} 
//源文件：md5.cs  
// MD5 Alogrithm  
// by rufi 2004.6.20 http://rufi.yculblog.com/ mmkey.com; 
 
 
//static state variables  
private static UInt32 A;  
private static UInt32 B;  
private static UInt32 C;  
private static UInt32 D;  

//number of bits to rotate in tranforming  
private const int S11 = 7;  
private const int S12 = 12;  
private const int S13 = 17;  
private const int S14 = 22;  
private const int S21 = 5;  
private const int S22 = 9;  
private const int S23 = 14;  
private const int S24 = 20;  
private const int S31 = 4;  
private const int S32 = 11;  
private const int S33 = 16;  
private const int S34 = 23;  
private const int S41 = 6;  
private const int S42 = 10;  
private const int S43 = 15;  
private const int S44 = 21;  


/* F, G, H and I are basic MD5 functions.  
* 四个非线性函数:  
*  
* F(X,Y,Z) =(X&Y)|((~X)&Z)  
* G(X,Y,Z) =(X&Z)|(Y&(~Z))  
* H(X,Y,Z) =X^Y^Z  
* I(X,Y,Z)=Y^(X|(~Z))  
*  
* （&与，|或，~非，^异或）  
*/  
private static UInt32 F(UInt32 x,UInt32 y,UInt32 z){  
return (x&y)|((~x)&z);  
}  
private static UInt32 G(UInt32 x,UInt32 y,UInt32 z){  
return (x&z)|(y&(~z));  
}  
private static UInt32 H(UInt32 x,UInt32 y,UInt32 z){  
return x^y^z;  
}  
private static UInt32 I(UInt32 x,UInt32 y,UInt32 z){  
return y^(x|(~z));  
}  

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.  
* Rotation is separate from addition to prevent recomputation.  
*/  
private static void FF(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti){  
a = a + F(b,c,d) + mj + ti;  
a = a << s | a >> (32-s);  
a += b;  
}  
private static void GG(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti){  
a = a + G(b,c,d) + mj + ti;  
a = a << s | a >> (32-s);  
a += b;  
}  
private static void HH(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti){  
a = a + H(b,c,d) + mj + ti;  
a = a << s | a >> (32-s);  
a += b;  
}  
private static void II(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti){  
a = a + I(b,c,d) + mj + ti;  
a = a << s | a >> (32-s);  
a += b;  
}  

private static void MD5_Init(){  
A=0x67452301; //in memory, this is 0x01234567  
B=0xefcdab89; //in memory, this is 0x89abcdef  
C=0x98badcfe; //in memory, this is 0xfedcba98  
D=0x10325476; //in memory, this is 0x76543210  
}  

private static UInt32[] MD5_Append(byte[] input){  
int zeros=0;  
int ones =1;  
int size=0;  
int n = input.Length;  
int m = n%64;  
if( m < 56 ){  
zeros = 55-m;  
size=n-m+64;  
}  
else if (m==56){  
zeros = 0;  
ones = 0;  
size=n+8;  
}  
else{  
zeros = 63-m+56;  
size=n+64-m+64;  
}  

ArrayList bs = new ArrayList(input);  
if(ones==1){  
bs.Add( (byte)0x80 ); // 0x80 = $10000000  
}  
for(int i=0;i<zeros;i++){  
bs.Add( (byte)0 );  
}  

UInt64 N = (UInt64) n * 8;  
byte h1=(byte)(N&0xFF);  
byte h2=(byte)((N>>8)&0xFF);  
byte h3=(byte)((N>>16)&0xFF);  
byte h4=(byte)((N>>24)&0xFF);  
byte h5=(byte)((N>>32)&0xFF);  
byte h6=(byte)((N>>40)&0xFF);  
byte h7=(byte)((N>>48)&0xFF);  
byte h8=(byte)(N>>56);  
bs.Add(h1);  
bs.Add(h2);  
bs.Add(h3);  
bs.Add(h4);  
bs.Add(h5);  
bs.Add(h6);  
bs.Add(h7);  
bs.Add(h8);  
byte[] ts=(byte[])bs.ToArray(typeof(byte));  

/* Decodes input (byte[]) into output (UInt32[]). Assumes len is  
* a multiple of 4.  
*/  
UInt32[] output = new UInt32[size/4];  
for(Int64 i=0,j=0;i<size;j++,i+=4){  
output[j]=(UInt32)(ts[i] | ts[i+1]<<8 | ts[i+2]<<16 | ts[i+3]<<24);  
}  
return output;  
}  
private static UInt32[] MD5_Trasform(UInt32[] x){  

UInt32 a,b,c,d;  

for(int k=0;k<x.Length;k+=16){  
a=A;  
b=B;



c=C;  
d=D;  

/* Round 1 */  
FF (ref a, b, c, d, x[k+ 0], S11, 0xd76aa478); /* 1 */  
FF (ref d, a, b, c, x[k+ 1], S12, 0xe8c7b756); /* 2 */  
FF (ref c, d, a, b, x[k+ 2], S13, 0x242070db); /* 3 */  
FF (ref b, c, d, a, x[k+ 3], S14, 0xc1bdceee); /* 4 */  
FF (ref a, b, c, d, x[k+ 4], S11, 0xf57c0faf); /* 5 */  
FF (ref d, a, b, c, x[k+ 5], S12, 0x4787c62a); /* 6 */  
FF (ref c, d, a, b, x[k+ 6], S13, 0xa8304613); /* 7 */  
FF (ref b, c, d, a, x[k+ 7], S14, 0xfd469501); /* 8 */  
FF (ref a, b, c, d, x[k+ 8], S11, 0x698098d8); /* 9 */  
FF (ref d, a, b, c, x[k+ 9], S12, 0x8b44f7af); /* 10 */  
FF (ref c, d, a, b, x[k+10], S13, 0xffff5bb1); /* 11 */  
FF (ref b, c, d, a, x[k+11], S14, 0x895cd7be); /* 12 */  
FF (ref a, b, c, d, x[k+12], S11, 0x6b901122); /* 13 */  
FF (ref d, a, b, c, x[k+13], S12, 0xfd987193); /* 14 */  
FF (ref c, d, a, b, x[k+14], S13, 0xa679438e); /* 15 */  
FF (ref b, c, d, a, x[k+15], S14, 0x49b40821); /* 16 */  

/* Round 2 */  
GG (ref a, b, c, d, x[k+ 1], S21, 0xf61e2562); /* 17 */  
GG (ref d, a, b, c, x[k+ 6], S22, 0xc040b340); /* 18 */  
GG (ref c, d, a, b, x[k+11], S23, 0x265e5a51); /* 19 */  
GG (ref b, c, d, a, x[k+ 0], S24, 0xe9b6c7aa); /* 20 */  
GG (ref a, b, c, d, x[k+ 5], S21, 0xd62f105d); /* 21 */  
GG (ref d, a, b, c, x[k+10], S22, 0x2441453); /* 22 */  
GG (ref c, d, a, b, x[k+15], S23, 0xd8a1e681); /* 23 */  
GG (ref b, c, d, a, x[k+ 4], S24, 0xe7d3fbc8); /* 24 */  
GG (ref a, b, c, d, x[k+ 9], S21, 0x21e1cde6); /* 25 */  
GG (ref d, a, b, c, x[k+14], S22, 0xc33707d6); /* 26 */  
GG (ref c, d, a, b, x[k+ 3], S23, 0xf4d50d87); /* 27 */  
GG (ref b, c, d, a, x[k+ 8], S24, 0x455a14ed); /* 28 */  
GG (ref a, b, c, d, x[k+13], S21, 0xa9e3e905); /* 29 */  
GG (ref d, a, b, c, x[k+ 2], S22, 0xfcefa3f8); /* 30 */  
GG (ref c, d, a, b, x[k+ 7], S23, 0x676f02d9); /* 31 */  
GG (ref b, c, d, a, x[k+12], S24, 0x8d2a4c8a); /* 32 */  

/* Round 3 */  
HH (ref a, b, c, d, x[k+ 5], S31, 0xfffa3942); /* 33 */  
HH (ref d, a, b, c, x[k+ 8], S32, 0x8771f681); /* 34 */  
HH (ref c, d, a, b, x[k+11], S33, 0x6d9d6122); /* 35 */  
HH (ref b, c, d, a, x[k+14], S34, 0xfde5380c); /* 36 */  
HH (ref a, b, c, d, x[k+ 1], S31, 0xa4beea44); /* 37 */  
HH (ref d, a, b, c, x[k+ 4], S32, 0x4bdecfa9); /* 38 */  
HH (ref c, d, a, b, x[k+ 7], S33, 0xf6bb4b60); /* 39 */  
HH (ref b, c, d, a, x[k+10], S34, 0xbebfbc70); /* 40 */  
HH (ref a, b, c, d, x[k+13], S31, 0x289b7ec6); /* 41 */  
HH (ref d, a, b, c, x[k+ 0], S32, 0xeaa127fa); /* 42 */  
HH (ref c, d, a, b, x[k+ 3], S33, 0xd4ef3085); /* 43 */  
HH (ref b, c, d, a, x[k+ 6], S34, 0x4881d05); /* 44 */  
HH (ref a, b, c, d, x[k+ 9], S31, 0xd9d4d039); /* 45 */  
HH (ref d, a, b, c, x[k+12], S32, 0xe6db99e5); /* 46 */  
HH (ref c, d, a, b, x[k+15], S33, 0x1fa27cf8); /* 47 */  
HH (ref b, c, d, a, x[k+ 2], S34, 0xc4ac5665); /* 48 */  

/* Round 4 */  
II (ref a, b, c, d, x[k+ 0], S41, 0xf4292244); /* 49 */  
II (ref d, a, b, c, x[k+ 7], S42, 0x432aff97); /* 50 */  
II (ref c, d, a, b, x[k+14], S43, 0xab9423a7); /* 51 */  
II (ref b, c, d, a, x[k+ 5], S44, 0xfc93a039); /* 52 */  
II (ref a, b, c, d, x[k+12], S41, 0x655b59c3); /* 53 */  
II (ref d, a, b, c, x[k+ 3], S42, 0x8f0ccc92); /* 54 */  
II (ref c, d, a, b, x[k+10], S43, 0xffeff47d); /* 55 */  
II (ref b, c, d, a, x[k+ 1], S44, 0x85845dd1); /* 56 */  
II (ref a, b, c, d, x[k+ 8], S41, 0x6fa87e4f); /* 57 */  
II (ref d, a, b, c, x[k+15], S42, 0xfe2ce6e0); /* 58 */  
II (ref c, d, a, b, x[k+ 6], S43, 0xa3014314); /* 59 */  
II (ref b, c, d, a, x[k+13], S44, 0x4e0811a1); /* 60 */  
II (ref a, b, c, d, x[k+ 4], S41, 0xf7537e82); /* 61 */  
II (ref d, a, b, c, x[k+11], S42, 0xbd3af235); /* 62 */  
II (ref c, d, a, b, x[k+ 2], S43, 0x2ad7d2bb); /* 63 */  
II (ref b, c, d, a, x[k+ 9], S44, 0xeb86d391); /* 64 */  

A+=a;  
B+=b;  
C+=c;  
D+=d;  
}  
return new UInt32[]{A,B,C,D};  
}  
public static byte[] MD5Array(byte[] input){  
MD5_Init();  
UInt32[] block = MD5_Append(input);  
UInt32[] bits = MD5_Trasform(block);  

/* Encodes bits (UInt32[]) into output (byte[]). Assumes len is  
* a multiple of 4.  
*/  
byte[] output=new byte[bits.Length*4];  
for(int i=0,j=0;i<bits.Length;i++,j+=4){  
output[j] = (byte)(bits[i] & 0xff);  
output[j+1] = (byte)((bits[i] >> 8) & 0xff);  
output[j+2] = (byte)((bits[i] >> 16) & 0xff);  
output[j+3] = (byte)((bits[i] >> 24) & 0xff);  
}  
return output;  
}  

public static string ArrayToHexString(byte[] array,bool uppercase){  
string hexString="";  
string format="x2";  
if(uppercase){  
format="X2";  
}  
foreach(byte b in array){  
hexString += b.ToString(format);  
}  
return hexString;  
}  

public static string MDString(string message){  
char[] c = message.ToCharArray();  
byte[] b = new byte[c.Length];  
for(int i=0;i<c.Length;i++){  
b[i]=(byte)c[i];  
}  
byte[] digest = MD5Array(b);  
return ArrayToHexString(digest,false);  
}  
public static string MDFile(string fileName){  
FileStream fs=File.Open(fileName,FileMode.Open,FileAccess.Read);  
byte[] array=new byte[fs.Length];  
fs.Read(array,0,(int)fs.Length);  
byte[] digest = MD5Array(array);  
fs.Close();  
return ArrayToHexString(digest,false);  
}  

public static string Test(string message){  
return MD5.MDString(message);  
}  
public static string TestSuite(){  
string s = "";  
s+=Test("");  
s+=Test("a");  
s+=Test("abc");  
s+=Test("message digest");  
s+=Test("abcdefghijklmnopqrstuvwxyz");  
s+=Test("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");  
s+=Test("12345678901234567890123456789012345678901234567890123456789012345678901234567890");  
return s;  
}  
}
}