C#笔记:MD5加密类 MD5似乎要淘汰。现在推荐使用SHA256算法来进行替代。但是我是一个非常念旧的人。我就是要使用MD5来加密。找了很久。终于让我找到了手工实现的类库。激动。。。。实测可用。。妈妈终于担心我被黑了。 public class Md5 { private static UInt32 A; private static UInt32 B; private static UInt32 C; private static UInt32 D; 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. // 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)) // (& AND,| OR,~NOT,^XOR) 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 = 63; ones = 1; size = n + 8 + 64; } else { zeros = 63 - m + 56; size = n + 64 - m + 64; } List<byte> bs = new List<byte>(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 = bs.ToArray(); // 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[] MyMD5Array(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 MyMD5String(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 = MyMD5Array(b); return ArrayToHexString(digest, true); } public static string MyMD5File(string fileName) { byte[] array = null; FileStream fs = null; try { fs = File.Open(fileName, FileMode.Open, FileAccess.Read); array = new byte[fs.Length]; fs.Read(array, 0, (int)fs.Length); } catch (Exception ex) { Console.WriteLine(ex.Message); } byte[] digest = MyMD5Array(array); fs.Close(); return ArrayToHexString(digest, true); } } 来自 大脸猫 写于 2015-02-16 22:11 -- 更新于2020-10-19 13:06 -- 0 条评论