md5.cs

这是MD5验证的CSharp源码。作加密解密的可以看看。

using System;
using System.Collections;
using System.IO;
using System.Text;
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;    
	}
}