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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=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 "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=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; } /*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); } } }