都是编码惹的祸
笔者在使用c#（System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile）
对字符串加密时，发现如果字符串中如果包含中文字符时，加密的结果与原来用DELPHI实现的加密算法不一样。笔者第一感觉就是编码的问题，因为笔者曾经在用delphi和C#实现同一算法时，吃尽了中文字符编码差异的苦头。
开始解决问题
上网Google C#和MD5，发现了一个别人用c#实现的MD5算法，
//源文件：md5.cs
// MD5 Alogrithm
// by rufi 2004.6.20 http://rufi.yculblog.com/
using System;
using System.Collections;
using System.IO;
namespace mymd5
{
public class MD5
{
//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=0×67452301; //in memory, this is 0×01234567
B=0xefcdab89; //in memory, this is 0×89abcdef
C=0×98badcfe; //in memory, this is 0xfedcba98
D=0×10325476; //in memory, this is 0×76543210
}
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)0×80 ); // 0×80 = $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, 0×242070db); /* 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, 0×4787c62a); /* 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, 0×698098d8); /* 9 */
FF (ref d, a, b, c, x[k+ 9], S12, 0×8b44f7af); /* 10 */
FF (ref c, d, a, b, x[k+10], S13, 0xffff5bb1); /* 11 */
FF (ref b, c, d, a, x[k+11], S14, 0×895cd7be); /* 12 */
FF (ref a, b, c, d, x[k+12], S11, 0×6b901122); /* 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, 0×49b40821); /* 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, 0×265e5a51); /* 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, 0×2441453); /* 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, 0×21e1cde6); /* 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, 0×455a14ed); /* 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, 0×676f02d9); /* 31 */
GG (ref b, c, d, a, x[k+12], S24, 0×8d2a4c8a); /* 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, 0×8771f681); /* 34 */
HH (ref c, d, a, b, x[k+11], S33, 0×6d9d6122); /* 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, 0×4bdecfa9); /* 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, 0×289b7ec6); /* 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, 0×4881d05); /* 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, 0×1fa27cf8); /* 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, 0×432aff97); /* 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, 0×655b59c3); /* 53 */
II (ref d, a, b, c, x[k+ 3], S42, 0×8f0ccc92); /* 54 */
II (ref c, d, a, b, x[k+10], S43, 0xffeff47d); /* 55 */
II (ref b, c, d, a, x[k+ 1], S44, 0×85845dd1); /* 56 */
II (ref a, b, c, d, x[k+ 8], S41, 0×6fa87e4f); /* 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, 0×4e0811a1); /* 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, 0×2ad7d2bb); /* 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 "rnMD5 (""+message+"") = " + 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;
//}
}
}
迫不及待的试验之，发现仍然是对中文字符加密时，结果不正确，分析上面的代码发现问题所在，是写上边这段代码的同仁有一点小小的疏忽 : ）
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);
}
问题就出现在这里，
因为一个汉字要占用两个2个byte的空间，一个char在C#中也是占用2个byte的空间。
for(int i=0;i<c.Length;i++)
{
b[i]=(byte)c[i];
}
看上边的代码，char转换为byte时候，只取了char的低字节，对于数字和英文字母低字节正好是
ANSI编码数值，因为数字和字母只占用1个byte。而对于汉字，将char转换为byte时候就丢失了一个byte，因此加密结果会出错。
于是笔者对上边的代码进行了修改，
public static string MDString(string message)
{
Byte[] b=System.Text.Encoding.Default.GetBytes(message);
//ANSI编码
byte[] digest = MD5Array(b);
return ArrayToHexString(digest,false);
}
经这样一改，在网上搜到的那个C#实现的md5算法和原来用delphi实现的md5算法一样了，这是因为什么呢，因为widows操作系统默认的字符编码是ANSI。
那么System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile 函数的md5结果应该怎样解释呢？
于是笔者又写了下面的函数，
public static string MDStringEx(string message,System.Text.Encoding ed)
{
Byte[] b=ed.GetBytes(message);
byte[] digest = MD5Array(b);
return ArrayToHexString(digest,false);
}
该函数指定了在进行md5加密时候对字符的编码方式。经过笔者试验，发现System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile对字符串进行md5加密时，对字符进行了UTF8编码。英文字母和数字的ANSI编码和UTF8编码是一样的，因此，对英文和数字进行md5加密的结果都一样。而对于有汉字的字符串
String s =”汉字”;
MDStringEx(s,System.Text.Encoding.Unicode);
System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s,”MD5”);
结果是一样的。
这下子，一切都明白了:)
另外的收获
问题是解决了，但是笔者在想，难道.NET就没有提供比较通用的md5加密算法吗？呵呵，查找一番，笔者发现了
System.Security.Cryptography.MD5CryptoServiceProvider类，可以byte[]进行md5加密，只是对字符串加密时候使用起来不太方便，我们可以简单的写个函数方便使用。
public static string sysmd5(string input ,System.Text.Encoding ed)
{
System.Security.Cryptography.MD5CryptoServiceProvider sysmd5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] bytes = ed.GetBytes(input);
bytes = sysmd5.ComputeHash( bytes );
sysmd5.Clear();
string ret = "";
for(int i=0 ; i<bytes.Length ; i++)
{
ret += bytes[i].ToString("X2");
}
return ret;
}
下面是经笔者整理的md5算法单元代码如下
/*
* zero 整理
* 2007.2.18 旧历新年：）
* http://blog.csdn.net/sxf_zero
*
*/
using System;
using System.Collections;
using System.IO;
namespace mymd5
{
public class MD5_OK
{
//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=0×67452301; //in memory, this is 0×01234567
B=0xefcdab89; //in memory, this is 0×89abcdef
C=0×98badcfe; //in memory, this is 0xfedcba98
D=0×10325476; //in memory, this is 0×76543210
}
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)0×80 ); // 0×80 = $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, 0×242070db); /* 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, 0×4787c62a); /* 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, 0×698098d8); /* 9 */
FF (ref d, a, b, c, x[k+ 9], S12, 0×8b44f7af); /* 10 */
FF (ref c, d, a, b, x[k+10], S13, 0xffff5bb1); /* 11 */
FF (ref b, c, d, a, x[k+11], S14, 0×895cd7be); /* 12 */
FF (ref a, b, c, d, x[k+12], S11, 0×6b901122); /* 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, 0×49b40821); /* 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, 0×265e5a51); /* 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, 0×2441453); /* 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, 0×21e1cde6); /* 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, 0×455a14ed); /* 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, 0×676f02d9); /* 31 */
GG (ref b, c, d, a, x[k+12], S24, 0×8d2a4c8a); /* 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, 0×8771f681); /* 34 */
HH (ref c, d, a, b, x[k+11], S33, 0×6d9d6122); /* 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, 0×4bdecfa9); /* 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, 0×289b7ec6); /* 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, 0×4881d05); /* 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, 0×1fa27cf8); /* 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, 0×432aff97); /* 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, 0×655b59c3); /* 53 */
II (ref d, a, b, c, x[k+ 3], S42, 0×8f0ccc92); /* 54 */
II (ref c, d, a, b, x[k+10], S43, 0xffeff47d); /* 55 */
II (ref b, c, d, a, x[k+ 1], S44, 0×85845dd1); /* 56 */
II (ref a, b, c, d, x[k+ 8], S41, 0×6fa87e4f); /* 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, 0×4e0811a1); /* 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, 0×2ad7d2bb); /* 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;
}
/*BY ZERO QQ:30675682 EMAIL:sxf_zero@yahoo.com.cn*/
public static string MDString(string message)
{
Byte[] b=System.Text.Encoding.Default.GetBytes(message);
byte[] digest = MD5Array(b);
return ArrayToHexString(digest,false);
}
/*BY ZERO QQ:30675682 EMAIL:sxf_zero@yahoo.com.cn*/
public static string MDStringEx(string message,System.Text.Encoding ed)
{
Byte[] b=ed.GetBytes(message);
byte[] digest = MD5Array(b);
return ArrayToHexString(digest,false);
}
/*BY ZERO QQ:30675682 EMAIL:sxf_zero@yahoo.com.cn*/
public static string sysmd5(string input ,System.Text.Encoding ed)
{
System.Security.Cryptography.MD5CryptoServiceProvider sysmd5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] bytes = ed.GetBytes(input);
bytes = sysmd5.ComputeHash( bytes );
sysmd5.Clear();
string ret = "";
for(int i=0 ; i<bytes.Length ; i++)
{
ret += bytes[i].ToString("X2");
}
return ret;
}
//
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);
}
}
}