Пример #1
0
 internal static byte[] GetHashFinalBlock(byte[] input, int ibStart, int cbSize, ABCDStruct ABCD, Int64 len)
 {
     byte[] working = new byte[64];
     byte[] length = BitConverter.GetBytes(len);
     //Padding is a single bit 1, followed by the number of 0s required to make size congruent to 448 modulo 512. Step 1 of RFC 1321    
     //The CLR ensures that our buffer is 0-assigned, we don't need to explicitly set it. This is why it ends up being quicker to just  
     //use a temporary array rather then doing in-place assignment (5% for small inputs)  
     Array.Copy(input, ibStart, working, 0, cbSize);
     working[cbSize] = 0x80;
     //We have enough room to store the length in this chunk  
     if (cbSize <= 56)
     {
         Array.Copy(length, 0, working, 56, 8);
         GetHashBlock(working, ref ABCD, 0);
     }
     else  //We need an aditional chunk to store the length  
     {
         GetHashBlock(working, ref ABCD, 0);
         //Create an entirely new chunk due to the 0-assigned trick mentioned above, to avoid an extra function call clearing the array  
         working = new byte[64];
         Array.Copy(length, 0, working, 56, 8);
         GetHashBlock(working, ref ABCD, 0);
     }
     byte[] output = new byte[16];
     Array.Copy(BitConverter.GetBytes(ABCD.A), 0, output, 0, 4);
     Array.Copy(BitConverter.GetBytes(ABCD.B), 0, output, 4, 4);
     Array.Copy(BitConverter.GetBytes(ABCD.C), 0, output, 8, 4);
     Array.Copy(BitConverter.GetBytes(ABCD.D), 0, output, 12, 4);
     return output;
 }
Пример #2
0
 public static byte[] GetHash(byte[] input)
 {
     if (null == input)
         throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
     //Intitial values defined in RFC 1321  
     ABCDStruct abcd = new ABCDStruct();
     abcd.A = 0x67452301;
     abcd.B = 0xefcdab89;
     abcd.C = 0x98badcfe;
     abcd.D = 0x10325476;
     //We pass in the input array by block, the final block of data must be handled specialy for padding & length embeding  
     int startIndex = 0;
     while (startIndex <= input.Length - 64)
     {
         MD5Core.GetHashBlock(input, ref abcd, startIndex);
         startIndex += 64;
     }
     // The final data block.   
     return MD5Core.GetHashFinalBlock(input, startIndex, input.Length - startIndex, abcd, (Int64)input.Length * 8);
 }
Пример #3
0
 // Performs a single block transform of MD5 for a given set of ABCD inputs  
 /* If implementing your own hashing framework, be sure to set the initial ABCD correctly according to RFC 1321: 
 //    A = 0x67452301; 
 //    B = 0xefcdab89; 
 //    C = 0x98badcfe; 
 //    D = 0x10325476; 
 */
 internal static void GetHashBlock(byte[] input, ref ABCDStruct ABCDValue, int ibStart)
 {
     uint[] temp = Converter(input, ibStart);
     uint a = ABCDValue.A;
     uint b = ABCDValue.B;
     uint c = ABCDValue.C;
     uint d = ABCDValue.D;
     a = r1(a, b, c, d, temp[0], 7, 0xd76aa478);
     d = r1(d, a, b, c, temp[1], 12, 0xe8c7b756);
     c = r1(c, d, a, b, temp[2], 17, 0x242070db);
     b = r1(b, c, d, a, temp[3], 22, 0xc1bdceee);
     a = r1(a, b, c, d, temp[4], 7, 0xf57c0faf);
     d = r1(d, a, b, c, temp[5], 12, 0x4787c62a);
     c = r1(c, d, a, b, temp[6], 17, 0xa8304613);
     b = r1(b, c, d, a, temp[7], 22, 0xfd469501);
     a = r1(a, b, c, d, temp[8], 7, 0x698098d8);
     d = r1(d, a, b, c, temp[9], 12, 0x8b44f7af);
     c = r1(c, d, a, b, temp[10], 17, 0xffff5bb1);
     b = r1(b, c, d, a, temp[11], 22, 0x895cd7be);
     a = r1(a, b, c, d, temp[12], 7, 0x6b901122);
     d = r1(d, a, b, c, temp[13], 12, 0xfd987193);
     c = r1(c, d, a, b, temp[14], 17, 0xa679438e);
     b = r1(b, c, d, a, temp[15], 22, 0x49b40821);
     a = r2(a, b, c, d, temp[1], 5, 0xf61e2562);
     d = r2(d, a, b, c, temp[6], 9, 0xc040b340);
     c = r2(c, d, a, b, temp[11], 14, 0x265e5a51);
     b = r2(b, c, d, a, temp[0], 20, 0xe9b6c7aa);
     a = r2(a, b, c, d, temp[5], 5, 0xd62f105d);
     d = r2(d, a, b, c, temp[10], 9, 0x02441453);
     c = r2(c, d, a, b, temp[15], 14, 0xd8a1e681);
     b = r2(b, c, d, a, temp[4], 20, 0xe7d3fbc8);
     a = r2(a, b, c, d, temp[9], 5, 0x21e1cde6);
     d = r2(d, a, b, c, temp[14], 9, 0xc33707d6);
     c = r2(c, d, a, b, temp[3], 14, 0xf4d50d87);
     b = r2(b, c, d, a, temp[8], 20, 0x455a14ed);
     a = r2(a, b, c, d, temp[13], 5, 0xa9e3e905);
     d = r2(d, a, b, c, temp[2], 9, 0xfcefa3f8);
     c = r2(c, d, a, b, temp[7], 14, 0x676f02d9);
     b = r2(b, c, d, a, temp[12], 20, 0x8d2a4c8a);
     a = r3(a, b, c, d, temp[5], 4, 0xfffa3942);
     d = r3(d, a, b, c, temp[8], 11, 0x8771f681);
     c = r3(c, d, a, b, temp[11], 16, 0x6d9d6122);
     b = r3(b, c, d, a, temp[14], 23, 0xfde5380c);
     a = r3(a, b, c, d, temp[1], 4, 0xa4beea44);
     d = r3(d, a, b, c, temp[4], 11, 0x4bdecfa9);
     c = r3(c, d, a, b, temp[7], 16, 0xf6bb4b60);
     b = r3(b, c, d, a, temp[10], 23, 0xbebfbc70);
     a = r3(a, b, c, d, temp[13], 4, 0x289b7ec6);
     d = r3(d, a, b, c, temp[0], 11, 0xeaa127fa);
     c = r3(c, d, a, b, temp[3], 16, 0xd4ef3085);
     b = r3(b, c, d, a, temp[6], 23, 0x04881d05);
     a = r3(a, b, c, d, temp[9], 4, 0xd9d4d039);
     d = r3(d, a, b, c, temp[12], 11, 0xe6db99e5);
     c = r3(c, d, a, b, temp[15], 16, 0x1fa27cf8);
     b = r3(b, c, d, a, temp[2], 23, 0xc4ac5665);
     a = r4(a, b, c, d, temp[0], 6, 0xf4292244);
     d = r4(d, a, b, c, temp[7], 10, 0x432aff97);
     c = r4(c, d, a, b, temp[14], 15, 0xab9423a7);
     b = r4(b, c, d, a, temp[5], 21, 0xfc93a039);
     a = r4(a, b, c, d, temp[12], 6, 0x655b59c3);
     d = r4(d, a, b, c, temp[3], 10, 0x8f0ccc92);
     c = r4(c, d, a, b, temp[10], 15, 0xffeff47d);
     b = r4(b, c, d, a, temp[1], 21, 0x85845dd1);
     a = r4(a, b, c, d, temp[8], 6, 0x6fa87e4f);
     d = r4(d, a, b, c, temp[15], 10, 0xfe2ce6e0);
     c = r4(c, d, a, b, temp[6], 15, 0xa3014314);
     b = r4(b, c, d, a, temp[13], 21, 0x4e0811a1);
     a = r4(a, b, c, d, temp[4], 6, 0xf7537e82);
     d = r4(d, a, b, c, temp[11], 10, 0xbd3af235);
     c = r4(c, d, a, b, temp[2], 15, 0x2ad7d2bb);
     b = r4(b, c, d, a, temp[9], 21, 0xeb86d391);
     ABCDValue.A = unchecked(a + ABCDValue.A);
     ABCDValue.B = unchecked(b + ABCDValue.B);
     ABCDValue.C = unchecked(c + ABCDValue.C);
     ABCDValue.D = unchecked(d + ABCDValue.D);
     return;
 }