Mercurial > projects > ldc
view tango/tango/io/digest/Md2.d @ 132:1700239cab2e trunk
[svn r136] MAJOR UNSTABLE UPDATE!!!
Initial commit after moving to Tango instead of Phobos.
Lots of bugfixes...
This build is not suitable for most things.
| author | lindquist |
|---|---|
| date | Fri, 11 Jan 2008 17:57:40 +0100 |
| parents | |
| children |
line wrap: on
line source
/******************************************************************************* copyright: Copyright (c) 2006 Tango. All rights reserved license: BSD style: see doc/license.txt for details version: Initial release: Feb 2006 author: Regan Heath, Oskar Linde This module implements the MD2 Message Digest Algorithm as described by RFC 1319 The MD2 Message-Digest Algorithm. B. Kaliski. April 1992. *******************************************************************************/ module tango.io.digest.Md2; public import tango.io.digest.Digest; private import tango.io.digest.MerkleDamgard; /******************************************************************************* *******************************************************************************/ class Md2 : MerkleDamgard { private ubyte[16] C, state; /*********************************************************************** Construct an Md2 ***********************************************************************/ this() { } /*********************************************************************** Initialize the cipher Remarks: Returns the cipher state to it's initial value ***********************************************************************/ protected override void reset() { super.reset(); state[] = 0; C[] = 0; } /*********************************************************************** Obtain the digest Returns: the digest Remarks: Returns a digest of the current cipher state, this may be the final digest, or a digest of the state between calls to update() ***********************************************************************/ protected override void createDigest(ubyte[] buf) { buf[] = state; } /*********************************************************************** The MD 2 digest size is 16 bytes ***********************************************************************/ uint digestSize() { return 16; } /*********************************************************************** block size Returns: the block size Remarks: Specifies the size (in bytes) of the block of data to pass to each call to transform(). For MD2 the blockSize is 16. ***********************************************************************/ protected override uint blockSize() { return 16; } /*********************************************************************** Length padding size Returns: the length padding size Remarks: Specifies the size (in bytes) of the padding which uses the length of the data which has been ciphered, this padding is carried out by the padLength method. For MD2 the addSize is 0 ***********************************************************************/ protected override uint addSize() { return 0; } /*********************************************************************** Pads the cipher data Params: data = a slice of the cipher buffer to fill with padding Remarks: Fills the passed buffer slice with the appropriate padding for the final call to transform(). This padding will fill the cipher buffer up to blockSize()-addSize(). ***********************************************************************/ protected override void padMessage (ubyte[] data) { /* Padding is performed as follows: "i" bytes of value "i" * are appended to the message so that the length in bytes * of the padded message becomes congruent to 0, modulo 16. * At least one byte and at most 16 bytes are appended. */ data[0..$] = cast(ubyte) data.length; } /*********************************************************************** Performs the cipher on a block of data Params: data = the block of data to cipher Remarks: The actual cipher algorithm is carried out by this method on the passed block of data. This method is called for every blockSize() bytes of input data and once more with the remaining data padded to blockSize(). ***********************************************************************/ protected override void transform (ubyte[] input) { ubyte[48] X; uint t,i,j; X[0..16] = state[]; X[16..32] = input[]; for (i = 0; i < 16; i++) X[i+32] = cast(ubyte) (state[i] ^ input[i]); t = 0; for (i = 0; i < 18; i++) { for (j = 0; j < 48; j++) t = X[j] ^= PI[t]; t = (t + i) & 0xff; } state[] = X[0..16]; t = C[15]; for (i = 0; i < 16; i++) t = C[i] ^= PI[input[i] ^ t]; } /*********************************************************************** Final processing of cipher. Remarks: This method is called after the final transform just prior to the creation of the final digest. The MD2 algorithm requires an additional step at this stage. Future ciphers may or may not require this method. ***********************************************************************/ protected override void extend() { transform(C); } } /******************************************************************************* *******************************************************************************/ private const ubyte[256] PI = [ 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 ]; /******************************************************************************* *******************************************************************************/ version (UnitTest) { unittest { static char[][] strings = [ "", "a", "abc", "message digest", "abcdefghijklmnopqrstuvwxyz", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", "12345678901234567890123456789012345678901234567890123456789012345678901234567890" ]; static char[][] results = [ "8350e5a3e24c153df2275c9f80692773", "32ec01ec4a6dac72c0ab96fb34c0b5d1", "da853b0d3f88d99b30283a69e6ded6bb", "ab4f496bfb2a530b219ff33031fe06b0", "4e8ddff3650292ab5a4108c3aa47940b", "da33def2a42df13975352846c30338cd", "d5976f79d83d3a0dc9806c3c66f3efd8" ]; Md2 h = new Md2(); foreach (int i, char[] s; strings) { h.update(s); char[] d = h.hexDigest(); assert(d == results[i],":("~s~")("~d~")!=("~results[i]~")"); } } }