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From clauflibitFriiDump-0.5.3.1

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This commit is contained in:
Braden McDaniel 2013-11-01 12:26:04 -04:00
parent fe937e7f4b
commit 87b108d6a1
63 changed files with 11067 additions and 26 deletions
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libmultihash/edonkey.c Normal file
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/***************************************************************************
* Copyright (C) 2007 by SukkoPera *
* sukkopera@sukkology.net *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
/* As Wikipedia (http://en.wikipedia.org/wiki/Ed2k_link) says:
* The ed2k hash function is a MD4 root hash of a MD4 hash list, and gives a
* different result than simply MD4: The file data is divided into full
* chunks of 9728000 bytes plus a remainder chunk, and a separate 128-bit
* MD4 checksum is computed for each. The ed2k hash is computed by
* concatenating the chunks' MD4 checksums in order and hashing the result
*using MD4.
*/
#include <stdio.h>
#include "edonkey.h"
#include "md4.h"
void ed2khash_starts (ed2khash_context *ctx) {
md4_starts (&(ctx -> md4cur));
md4_starts (&(ctx -> md4final));
ctx -> bytes_processed = 0;
ctx -> chunks = 0;
return;
}
void ed2khash_update (ed2khash_context *ctx, unsigned char *input, int ilen) {
unsigned long x;
while (ilen > 0) {
if (ctx -> bytes_processed + ilen >= ED2KHASH_CHUNKSIZE)
x = ED2KHASH_CHUNKSIZE - ctx -> bytes_processed;
else
x = ilen;
md4_update (&(ctx -> md4cur), input, x);
if ((ctx -> bytes_processed += x) % ED2KHASH_CHUNKSIZE == 0) {
/* End of a chunk, save current MD4 and start a new one */
md4_finish (&(ctx -> md4cur), ctx -> lastmd4);
md4_starts (&(ctx -> md4cur));
ctx -> bytes_processed = 0;
ctx -> chunks++;
md4_update (&(ctx -> md4final), ctx -> lastmd4, MD4_DIGESTSIZE);
}
ilen -= x;
input += x;
}
return;
}
void ed2khash_finish (ed2khash_context *ctx, unsigned char *output) {
if (ctx -> chunks > 0) {
md4_finish (&(ctx -> md4cur), ctx -> lastmd4);
md4_update (&(ctx -> md4final), ctx -> lastmd4, MD4_DIGESTSIZE);
md4_finish (&(ctx -> md4final), output);
} else {
/* If we have a single chunk, use its MD4 straight away */
md4_finish (&(ctx -> md4cur), output);
}
return;
}