MD5加密算法(16位，32) .zip_C# MD5_CSharp MD5 32_MD5 CSharp_md5_md5 32

以下为MD5算法用c#的实现 //MD5.cs //MD5 16-bit,32-bits algorithm implemented in C# using System; using System.Text; namespace Encrypter { /// <summary> /// Summary description for MD5. /// </summary> 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);