wp7上MD5加密类
- using System;
- using System.Net;
- using System.Text;
- using System.Windows;
- using System.Windows.Controls;
- using System.Windows.Documents;
- using System.Windows.Ink;
- using System.Windows.Input;
- using System.Windows.Media;
- using System.Windows.Media.Animation;
- using System.Windows.Shapes;
- namespace Test.Utils
- {
- struct ABCDStruct
- {
- public uint A;
- public uint B;
- public uint C;
- public uint D;
- }
- /// <summary>
- /// md5加密类
- /// </summary>
- public sealed class MD5Core
- {
- //Prevent CSC from adding a default public constructor
- public MD5Core() { }
- public static byte[] GetHash(string input, Encoding encoding)
- {
- if (null == input)
- throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
- if (null == encoding)
- throw new System.ArgumentNullException("encoding", "Unable to calculate hash over a string without a default encoding. Consider using the GetHash(string) overload to use UTF8 Encoding");
- byte[] target = encoding.GetBytes(input);
- return GetHash(target);
- }
- public static byte[] GetHash(string input)
- {
- return GetHash(input, new UTF8Encoding());
- }
- public static string GetHashString(byte[] input)
- {
- if (null == input)
- throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
- string retval = BitConverter.ToString(GetHash(input));
- retvalretval = retval.Replace("-", "");
- return retval;
- }
- public static string GetHashString(string input, Encoding encoding)
- {
- if (null == input)
- throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
- if (null == encoding)
- throw new System.ArgumentNullException("encoding", "Unable to calculate hash over a string without a default encoding. Consider using the GetHashString(string) overload to use UTF8 Encoding");
- byte[] target = encoding.GetBytes(input);
- return GetHashString(target);
- }
- public static string GetHashString(string input)
- {
- return GetHashString(input, new UTF8Encoding());
- }
- 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);
- }
- 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;
- }
- // 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;
- }
- //Manually unrolling these equations nets us a 20% performance improvement
- private static uint r1(uint a, uint b, uint c, uint d, uint x, int s, uint t)
- {
- // (b + LSR((a + F(b, c, d) + x + t), s))
- //F(x, y, z) ((x & y) | ((x ^ 0xFFFFFFFF) & z))
- return unchecked(b + LSR((a + ((b & c) | ((b ^ 0xFFFFFFFF) & d)) + x + t), s));
- }
- private static uint r2(uint a, uint b, uint c, uint d, uint x, int s, uint t)
- {
- // (b + LSR((a + G(b, c, d) + x + t), s))
- //G(x, y, z) ((x & z) | (y & (z ^ 0xFFFFFFFF)))
- return unchecked(b + LSR((a + ((b & d) | (c & (d ^ 0xFFFFFFFF))) + x + t), s));
- }
- private static uint r3(uint a, uint b, uint c, uint d, uint x, int s, uint t)
- {
- // (b + LSR((a + H(b, c, d) + k + i), s))
- //H(x, y, z) (x ^ y ^ z)
- return unchecked(b + LSR((a + (b ^ c ^ d) + x + t), s));
- }
- private static uint r4(uint a, uint b, uint c, uint d, uint x, int s, uint t)
- {
- // (b + LSR((a + I(b, c, d) + k + i), s))
- //I(x, y, z) (y ^ (x | (z ^ 0xFFFFFFFF)))
- return unchecked(b + LSR((a + (c ^ (b | (d ^ 0xFFFFFFFF))) + x + t), s));
- }
- // Implementation of left rotate
- // s is an int instead of a uint becuase the CLR requires the argument passed to >>/<< is of
- // type int. Doing the demoting inside this function would add overhead.
- private static uint LSR(uint i, int s)
- {
- return ((i << s) | (i >> (32 - s)));
- }
- //Convert input array into array of UInts
- private static uint[] Converter(byte[] input, int ibStart)
- {
- if (null == input)
- throw new System.ArgumentNullException("input", "Unable convert null array to array of uInts");
- uint[] result = new uint[16];
- for (int i = 0; i < 16; i++)
- {
- result[i] = (uint)input[ibStart + i * 4];
- result[i] += (uint)input[ibStart + i * 4 + 1] << 8;
- result[i] += (uint)input[ibStart + i * 4 + 2] << 16;
- result[i] += (uint)input[ibStart + i * 4 + 3] << 24;
- }
- return result;
- }
- }
- }
转载于:https://blog.51cto.com/sxchao/846839
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