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。。
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);
}
}本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2015-02-16 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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