C#16位MD5加密算法

MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d)) '32位

MD5 = LCase(WordToHex(b) & WordToHex(c)) '16位

在asp中我们可以通过以上的 获取到16和32位的md5加密码

在C#中可以通过string strUserPwd = FormsAuthentication.HashPasswordForStoringInConfigFile(txtAdminPwd.Text,"md5");

获得32位加密码，现在我需要16位C#加密的算法，在网上看了些人家写的始终没有弄出来，各位大虾帮忙啊！

using System;

using System.Collections.Generic;

using System.Text;

namespace MYMD5

{

public class MD5

{

const int BITS_TO_A_BYTE = 8;

const int BYTES_TO_A_WORD = 4;

const int BITS_TO_A_WORD = 32;

private static long[] m_lOnBits = new long[30 + 1];

private static long[] m_l2Power = new long[30 + 1];

private static long LShift(long lValue, long iShiftBits)

{

long LShift = 0;

if (iShiftBits == 0)

{

LShift = lValue;

return LShift;

}

else

{

if (iShiftBits == 31)

{

if (Convert.ToBoolean(lValue & 1))

{

LShift = 0x80000000;

}

else

{

LShift = 0;

}

return LShift;

}

else

{

if (iShiftBits < 0 || iShiftBits > 31)

{

// Err.Raise 6;

}

}

}

if (Convert.ToBoolean((lValue & m_l2Power[31 - iShiftBits])))

{

LShift = ((lValue & m_lOnBits[31 - (iShiftBits + 1)]) * m_l2Power[iShiftBits]) | 0x80000000;

}

else

{

LShift = ((lValue & m_lOnBits[31 - iShiftBits]) * m_l2Power[iShiftBits]);

}

return LShift;

}

private static long RShift(long lValue, long iShiftBits)

{

long RShift = 0;

if (iShiftBits == 0)

{

RShift = lValue;

return RShift;

}

else

{

if (iShiftBits == 31)

{

if (Convert.ToBoolean(lValue & 0x80000000))

{

RShift = 1;

}

else

{

RShift = 0;

}

return RShift;

}

else

{

if (iShiftBits < 0 || iShiftBits > 31)

{

// Err.Raise 6;

}

}

}

RShift = (lValue & 0x7FFFFFFE) / m_l2Power[iShiftBits];

if (Convert.ToBoolean((lValue & 0x80000000)))

{

RShift = (RShift | (0x40000000 / m_l2Power[iShiftBits - 1]));

}

return RShift;

}

private static long RotateLeft(long lValue, long iShiftBits)

{

long RotateLeft = 0;

RotateLeft = LShift(lValue, iShiftBits) | RShift(lValue, (32 - iShiftBits));

return RotateLeft;

}

private static long AddUnsigned(long lX, long lY)

{

long AddUnsigned = 0;

long lX4 = 0;

long lY4 = 0;

long lX8 = 0;

long lY8 = 0;

long lResult = 0;

lX8 = lX & 0x80000000;

lY8 = lY & 0x80000000;

lX4 = lX & 0x40000000;

lY4 = lY & 0x40000000;

lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);

if (Convert.ToBoolean(lX4 & lY4))

{

lResult = lResult ^ 0x80000000 ^ lX8 ^ lY8;

}

else if (Convert.ToBoolean(lX4 | lY4))

{

if (Convert.ToBoolean(lResult & 0x40000000))

{

lResult = lResult ^ 0xC0000000 ^ lX8 ^ lY8;

}

else

{

lResult = lResult ^ 0x40000000 ^ lX8 ^ lY8;

}

}

else

{

lResult = lResult ^ lX8 ^ lY8;

}

AddUnsigned = lResult;

return AddUnsigned;

}

private static long md5_F(long x, long y, long z)

{

long md5_F = 0;

md5_F = (x & y) | ((~x) & z);

return md5_F;

}

private static long md5_G(long x, long y, long z)

{

long md5_G = 0;

md5_G = (x & z) | (y & (~z));

return md5_G;

}

private static long md5_H(long x, long y, long z)

{

long md5_H = 0;

md5_H = (x ^ y ^ z);

return md5_H;

}

private static long md5_I(long x, long y, long z)

{

long md5_I = 0;

md5_I = (y ^ (x | (~z)));

return md5_I;

}

private static void md5_FF(ref long a, long b, long c, long d, long x, long s, long ac)

{

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac));

a = RotateLeft(a, s);

a = AddUnsigned(a, b);

}

private static void md5_GG(ref long a, long b, long c, long d, long x, long s, long ac)

{

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac));

a = RotateLeft(a, s);

a = AddUnsigned(a, b);

}

private static void md5_HH(ref long a, long b, long c, long d, long x, long s, long ac)

{

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac));

a = RotateLeft(a, s);

a = AddUnsigned(a, b);

}

private static void md5_II(ref long a, long b, long c, long d, long x, long s, long ac)

{

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac));

a = RotateLeft(a, s);

a = AddUnsigned(a, b);

}

private static long[] ConvertToWordArray(string sMessage)

{

long[] ConvertToWordArray = null;

int lMessageLength = 0;

int lNumberOfWords = 0;

long[] lWordArray = null;

int lBytePosition = 0;

int lByteCount = 0;

int lWordCount = 0;

const int MODULUS_BITS = 512;

const int CONGRUENT_BITS = 448;

lMessageLength = sMessage.Length;

lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) / BITS_TO_A_BYTE)) / (MODULUS_BITS / BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS / BITS_TO_A_WORD);

lWordArray = new long[lNumberOfWords];

lBytePosition = 0;

lByteCount = 0;

while (lByteCount < lMessageLength)

{

lWordCount = lByteCount / BYTES_TO_A_WORD;

lBytePosition = (lByteCount % BYTES_TO_A_WORD) * BITS_TO_A_BYTE;

lWordArray[lWordCount] = lWordArray[lWordCount] | LShift(Convert.ToByte(sMessage.Substring(lByteCount, 1).ToCharArray()[0]), lBytePosition);

lByteCount = lByteCount + 1;

}

lWordCount = lByteCount / BYTES_TO_A_WORD;

lBytePosition = (lByteCount % BYTES_TO_A_WORD) * BITS_TO_A_BYTE;

lWordArray[lWordCount] = lWordArray[lWordCount] | LShift(0x80, lBytePosition);

lWordArray[lNumberOfWords - 2] = LShift(lMessageLength, 3);

lWordArray[lNumberOfWords - 1] = RShift(lMessageLength, 29);

ConvertToWordArray = lWordArray;

return ConvertToWordArray;

}

private static string WordToHex(long lValue)

{

string WordToHex = "";

long lByte = 0;

int lCount = 0;

for (lCount = 0; lCount <= 3; lCount++)

{

lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) & m_lOnBits[BITS_TO_A_BYTE - 1];

WordToHex = WordToHex + (("0" + ToHex(lByte)).Substring(("0" + ToHex(lByte)).Length - 2));

}

return WordToHex;

}

private static string ToHex(long dec)

{

string strhex = "";

while (dec > 0)

{

strhex = tohex(dec % 16) + strhex;

dec = dec / 16;

}

return strhex;

}

private static string tohex(long hex)

{

string strhex = "";

switch (hex)

{

case 10: strhex = "a"; break;

case 11: strhex = "b"; break;

case 12: strhex = "c"; break;

case 13: strhex = "d"; break;

case 14: strhex = "e"; break;

case 15: strhex = "f"; break;

default: strhex = hex.ToString(); break;

}

return strhex;

}

public static string Encrypt(string sMessage, int stype)

{

string MD5 = "";

for (int i = 0; i <= 30; i++)

{

m_lOnBits[i] = Convert.ToInt64(Math.Pow(2, i + 1) - 1);

m_l2Power[i] = Convert.ToInt64(Math.Pow(2, i));

}

long[] x = null;

int k = 0;

long AA = 0;

long BB = 0;

long CC = 0;

long DD = 0;

long a = 0;

long b = 0;

long c = 0;

long d = 0;

const int S11 = 7;

const int S12 = 12;

const int S13 = 17;

const int S14 = 22;

const int S21 = 5;

const int S22 = 9;

const int S23 = 14;

const int S24 = 20;

const int S31 = 4;

const int S32 = 11;

const int S33 = 16;

const int S34 = 23;

const int S41 = 6;

const int S42 = 10;

const int S43 = 15;

const int S44 = 21;

x = ConvertToWordArray(sMessage);

a = 0x67452301;

b = 0xEFCDAB89;

c = 0x98BADCFE;

d = 0x10325476;

for (k = 0; k < x.Length; k += 16)

{

AA = a;

BB = b;

CC = c;

DD = d;

md5_FF(ref a, b, c, d, x[k + 0], S11, 0xD76AA478);

md5_FF(ref d, a, b, c, x[k + 1], S12, 0xE8C7B756);

md5_FF(ref c, d, a, b, x[k + 2], S13, 0x242070DB);

md5_FF(ref b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);

md5_FF(ref a, b, c, d, x[k + 4], S11, 0xF57C0FAF);

md5_FF(ref d, a, b, c, x[k + 5], S12, 0x4787C62A);

md5_FF(ref c, d, a, b, x[k + 6], S13, 0xA8304613);

md5_FF(ref b, c, d, a, x[k + 7], S14, 0xFD469501);

md5_FF(ref a, b, c, d, x[k + 8], S11, 0x698098D8);

md5_FF(ref d, a, b, c, x[k + 9], S12, 0x8B44F7AF);

md5_FF(ref c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);

md5_FF(ref b, c, d, a, x[k + 11], S14, 0x895CD7BE);

md5_FF(ref a, b, c, d, x[k + 12], S11, 0x6B901122);

md5_FF(ref d, a, b, c, x[k + 13], S12, 0xFD987193);

md5_FF(ref c, d, a, b, x[k + 14], S13, 0xA679438E);

md5_FF(ref b, c, d, a, x[k + 15], S14, 0x49B40821);

md5_GG(ref a, b, c, d, x[k + 1], S21, 0xF61E2562);

md5_GG(ref d, a, b, c, x[k + 6], S22, 0xC040B340);

md5_GG(ref c, d, a, b, x[k + 11], S23, 0x265E5A51);

md5_GG(ref b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);

md5_GG(ref a, b, c, d, x[k + 5], S21, 0xD62F105D);

md5_GG(ref d, a, b, c, x[k + 10], S22, 0x2441453);

md5_GG(ref c, d, a, b, x[k + 15], S23, 0xD8A1E681);

md5_GG(ref b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);

md5_GG(ref a, b, c, d, x[k + 9], S21, 0x21E1CDE6);

md5_GG(ref d, a, b, c, x[k + 14], S22, 0xC33707D6);

md5_GG(ref c, d, a, b, x[k + 3], S23, 0xF4D50D87);

md5_GG(ref b, c, d, a, x[k + 8], S24, 0x455A14ED);

md5_GG(ref a, b, c, d, x[k + 13], S21, 0xA9E3E905);

md5_GG(ref d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);

md5_GG(ref c, d, a, b, x[k + 7], S23, 0x676F02D9);

md5_GG(ref b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);

md5_HH(ref a, b, c, d, x[k + 5], S31, 0xFFFA3942);

md5_HH(ref d, a, b, c, x[k + 8], S32, 0x8771F681);

md5_HH(ref c, d, a, b, x[k + 11], S33, 0x6D9D6122);

md5_HH(ref b, c, d, a, x[k + 14], S34, 0xFDE5380C);

md5_HH(ref a, b, c, d, x[k + 1], S31, 0xA4BEEA44);

md5_HH(ref d, a, b, c, x[k + 4], S32, 0x4BDECFA9);

md5_HH(ref c, d, a, b, x[k + 7], S33, 0xF6BB4B60);

md5_HH(ref b, c, d, a, x[k + 10], S34, 0xBEBFBC70);

md5_HH(ref a, b, c, d, x[k + 13], S31, 0x289B7EC6);

md5_HH(ref d, a, b, c, x[k + 0], S32, 0xEAA127FA);

md5_HH(ref c, d, a, b, x[k + 3], S33, 0xD4EF3085);

md5_HH(ref b, c, d, a, x[k + 6], S34, 0x4881D05);

md5_HH(ref a, b, c, d, x[k + 9], S31, 0xD9D4D039);

md5_HH(ref d, a, b, c, x[k + 12], S32, 0xE6DB99E5);

md5_HH(ref c, d, a, b, x[k + 15], S33, 0x1FA27CF8);

md5_HH(ref b, c, d, a, x[k + 2], S34, 0xC4AC5665);

md5_II(ref a, b, c, d, x[k + 0], S41, 0xF4292244);

md5_II(ref d, a, b, c, x[k + 7], S42, 0x432AFF97);

md5_II(ref c, d, a, b, x[k + 14], S43, 0xAB9423A7);

md5_II(ref b, c, d, a, x[k + 5], S44, 0xFC93A039);

md5_II(ref a, b, c, d, x[k + 12], S41, 0x655B59C3);

md5_II(ref d, a, b, c, x[k + 3], S42, 0x8F0CCC92);

md5_II(ref c, d, a, b, x[k + 10], S43, 0xFFEFF47D);

md5_II(ref b, c, d, a, x[k + 1], S44, 0x85845DD1);

md5_II(ref a, b, c, d, x[k + 8], S41, 0x6FA87E4F);

md5_II(ref d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);

md5_II(ref c, d, a, b, x[k + 6], S43, 0xA3014314);

md5_II(ref b, c, d, a, x[k + 13], S44, 0x4E0811A1);

md5_II(ref a, b, c, d, x[k + 4], S41, 0xF7537E82);

md5_II(ref d, a, b, c, x[k + 11], S42, 0xBD3AF235);

md5_II(ref c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);

md5_II(ref b, c, d, a, x[k + 9], S44, 0xEB86D391);

a = AddUnsigned(a, AA);

b = AddUnsigned(b, BB);

c = AddUnsigned(c, CC);

d = AddUnsigned(d, DD);

}

if (stype == 32)

{

MD5 = ((((WordToHex(a)) + (WordToHex(b))) + (WordToHex(c))) + (WordToHex(d))).ToLower();

}

else

{

MD5 = ((WordToHex(b)) + (WordToHex(c))).ToLower();

}

return MD5;

}

}

}

刚找了个算法，问题解决了贴出来给大家看看，

调用的时候直接 string strUserpwd =MD5.Encrypt(txtUserPwd.Text,16);

就可以，上面是16位，要32直接换成32就可以！