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394 | ////////////////////////////////////////////////////////////////////////////////
/// Name: MD4 Class
///
/// Purpose: aMule ed2k link creator
///
/// Last modified by: ThePolish <thepolish@vipmail.ru>
///
/// Copyright (c) 2004-2011 ThePolish ( thepolish@vipmail.ru )
///
/// Copyright (c) 2004-2011 Marcelo Roberto Jimenez ( phoenix@amule.org )
///
/// Copyright (c) 2004-2011 Alo Sarv ( madcat_@users.sourceforge.net )
///
/// Copyright (c) 2002-2011 Michael Buesch
/// Email: mbuesch@freenet.de
///
/// The algorithm is due to Ron Rivest. This code is based on code
/// written by Colin Plumb in 1993.
///
/// This code implements the MD4 message-digest algorithm.
///
/// 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.,
/// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
////////////////////////////////////////////////////////////////////////////////
#include <wx/ffile.h>
#include <wx/intl.h>
#include "md4.h"
#include "bithelp.h"
/// BIG ENDIAN byte reversing
#if wxBYTE_ORDER == wxBIG_ENDIAN
// Note: this code is harmless on little-endian machines.
void MD4::byteReverse(unsigned char *buf, unsigned longs)
{
do
{
uint32_t t;
t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
*(uint32_t *) buf = t;<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
buf += 4;
}
while (--longs);
}
#else
#define byteReverse(buf, len) do { } while (0)
#endif
/// Start MD4 accumulation.
/// Set bit count to 0 and buffer to mysteriousinitialization constants.
void MD4::MD4Init(struct MD4Context *ctx)
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
/// Update context to reflect the concatenation of another buffer full of bytes.
void MD4::MD4Update(struct MD4Context *ctx, unsigned char const *buf,
size_t len)
{
register uint32_t t;
// Update bitcount
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++; // Carry from low to high
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f; // Bytes already in shsInfo->data
// Handle any leading odd-sized chunks
if (t)
{
unsigned char *p = (unsigned char *) ctx->in + t;<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
t = 64 - t;
if (len < t)
{
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD4Transform(ctx->buf, (uint32_t *) ctx->in);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
buf += t;
len -= t;
}
// Process data in 64-byte chunks
while (len >= 64)
{
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD4Transform(ctx->buf, (uint32_t *) ctx->in);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
buf += 64;
len -= 64;
}
//Handle any remaining bytes of data.
memcpy(ctx->in, buf, len);
}
/// Final wrapup - pad to 64-byte boundary with the bit pattern
/// 1 0* (64-bit count of bits processed, MSB-first)
void MD4::MD4Final(struct MD4Context *ctx, unsigned char* digest)
{
unsigned int count;
unsigned char *p;
// Compute number of bytes mod 64
count = (ctx->bits[0] >> 3) & 0x3F;
// Set the first char of padding to 0x80.
//This is safe since there is always at least one byte free
p = ctx->in + count;
*p++ = 0x80;
// Bytes of padding needed to make 64 bytes
count = 64 - 1 - count;
// Pad out to 56 mod 64
if (count < 8)
{
// Two lots of padding: Pad the first block to 64 bytes
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD4Transform(ctx->buf, (uint32_t *) ctx->in);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
// Now fill the next block with 56 bytes
memset(ctx->in, 0, 56);
}
else
{
// Pad block to 56 bytes
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
// Append length in bits and transform
uint32_t * in32 = (uint32_t *) ctx->in;<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
in32[14] = ctx->bits[0];
in32[15] = ctx->bits[1];
MD4Transform(ctx->buf, (uint32_t *) ctx->in);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
byteReverse((unsigned char *) ctx->buf, 4);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
if (digest!=NULL)
{
memcpy(digest, ctx->buf, 16);
}
memset(ctx, 0, sizeof(*ctx)); // In case it's sensitive
}
/// The three core functions
#define MD4_F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define MD4_G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define MD4__H(x, y, z) ((x) ^ (y) ^ (z))
#define MD4_FF(a, b, c, d, x, s) { \
(a) += MD4_F ((b), (c), (d)) + (x); \
(a) = rol ((a), (s)); \
}
#define MD4_GG(a, b, c, d, x, s) { \
(a) += MD4_G ((b), (c), (d)) + (x) + (uint32_t)0x5a827999; \
(a) = rol ((a), (s)); \
}
#define MD4_HH(a, b, c, d, x, s) { \
(a) += MD4__H ((b), (c), (d)) + (x) + (uint32_t)0x6ed9eba1; \
(a) = rol ((a), (s)); \
}
/// The core of the MD4 algorithm
void MD4::MD4Transform(uint32_t buf[4], uint32_t const in[16])
{
register uint32_t a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD4_FF(a, b, c, d, in[0], 3); /* 1 */
MD4_FF(d, a, b, c, in[1], 7); /* 2 */
MD4_FF(c, d, a, b, in[2], 11); /* 3 */
MD4_FF(b, c, d, a, in[3], 19); /* 4 */
MD4_FF(a, b, c, d, in[4], 3); /* 5 */
MD4_FF(d, a, b, c, in[5], 7); /* 6 */
MD4_FF(c, d, a, b, in[6], 11); /* 7 */
MD4_FF(b, c, d, a, in[7], 19); /* 8 */
MD4_FF(a, b, c, d, in[8], 3); /* 9 */
MD4_FF(d, a, b, c, in[9], 7); /* 10 */
MD4_FF(c, d, a, b, in[10], 11); /* 11 */
MD4_FF(b, c, d, a, in[11], 19); /* 12 */
MD4_FF(a, b, c, d, in[12], 3); /* 13 */
MD4_FF(d, a, b, c, in[13], 7); /* 14 */
MD4_FF(c, d, a, b, in[14], 11); /* 15 */
MD4_FF(b, c, d, a, in[15], 19); /* 16 */
MD4_GG(a, b, c, d, in[0], 3); /* 17 */
MD4_GG(d, a, b, c, in[4], 5); /* 18 */
MD4_GG(c, d, a, b, in[8], 9); /* 19 */
MD4_GG(b, c, d, a, in[12], 13); /* 20 */
MD4_GG(a, b, c, d, in[1], 3); /* 21 */
MD4_GG(d, a, b, c, in[5], 5); /* 22 */
MD4_GG(c, d, a, b, in[9], 9); /* 23 */
MD4_GG(b, c, d, a, in[13], 13); /* 24 */
MD4_GG(a, b, c, d, in[2], 3); /* 25 */
MD4_GG(d, a, b, c, in[6], 5); /* 26 */
MD4_GG(c, d, a, b, in[10], 9); /* 27 */
MD4_GG(b, c, d, a, in[14], 13); /* 28 */
MD4_GG(a, b, c, d, in[3], 3); /* 29 */
MD4_GG(d, a, b, c, in[7], 5); /* 30 */
MD4_GG(c, d, a, b, in[11], 9); /* 31 */
MD4_GG(b, c, d, a, in[15], 13); /* 32 */
MD4_HH(a, b, c, d, in[0], 3); /* 33 */
MD4_HH(d, a, b, c, in[8], 9); /* 34 */
MD4_HH(c, d, a, b, in[4], 11); /* 35 */
MD4_HH(b, c, d, a, in[12], 15); /* 36 */
MD4_HH(a, b, c, d, in[2], 3); /* 37 */
MD4_HH(d, a, b, c, in[10], 9); /* 38 */
MD4_HH(c, d, a, b, in[6], 11); /* 39 */
MD4_HH(b, c, d, a, in[14], 15); /* 40 */
MD4_HH(a, b, c, d, in[1], 3); /* 41 */
MD4_HH(d, a, b, c, in[9], 9); /* 42 */
MD4_HH(c, d, a, b, in[5], 11); /* 43 */
MD4_HH(b, c, d, a, in[13], 15); /* 44 */
MD4_HH(a, b, c, d, in[3], 3); /* 45 */
MD4_HH(d, a, b, c, in[11], 9); /* 46 */
MD4_HH(c, d, a, b, in[7], 11); /* 47 */
MD4_HH(b, c, d, a, in[15], 15); /* 48 */
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
/// Algorithm verification
bool MD4::selfTest()
{
wxString test1(wxEmptyString);
wxString test1_md(wxT("31D6CFE0D16AE931B73C59D7E0C089C0"));
wxString test2(wxT("a"));
wxString test2_md(wxT("BDE52CB31DE33E46245E05FBDBD6FB24"));
wxString test3(wxT("abc"));
wxString test3_md(wxT("A448017AAF21D8525FC10AE87AA6729D"));
wxString test4(wxT("message digest"));
wxString test4_md(wxT("D9130A8164549FE818874806E1C7014B"));
wxString test5(wxT("abcdefghijklmnopqrstuvwxyz"));
wxString test5_md(wxT("D79E1C308AA5BBCDEEA8ED63DF412DA9"));
wxString test6(wxT("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
wxString test6_md(wxT("043F8582F241DB351CE627E153E7F0E4"));
wxString test7(wxT("12345678901234567890123456789012345678901234567890123456789012345678901234567890"));
wxString test7_md(wxT("E33B4DDC9C38F2199C3E7B164FCC0536"));
MD4 md4;
if (md4.calcMd4FromString(test1) != test1_md)
return false;
if (md4.calcMd4FromString(test2) != test2_md)
return false;
if (md4.calcMd4FromString(test3) != test3_md)
return false;
if (md4.calcMd4FromString(test4) != test4_md)
return false;
if (md4.calcMd4FromString(test5) != test5_md)
return false;
if (md4.calcMd4FromString(test6) != test6_md)
return false;
if (md4.calcMd4FromString(test7) != test7_md)
return false;
return true;
}
/// Get Md4 hash from a string
wxString MD4::calcMd4FromString(const wxString &buf)
{
MD4Context hdc;
unsigned char ret[MD4_HASHLEN_BYTE];
MD4Init(&hdc);
MD4Update(&hdc, (const unsigned char*)buf.c_str(), buf.length());<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
MD4Final(&hdc, ret);
return charToHex((const char*)ret, MD4_HASHLEN_BYTE);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
}
/// Get Md4 hash from a file
wxString MD4::calcMd4FromFile(const wxString &filename, MD4Hook hook)
{
MD4Context hdc;
// Open file and let wxFFile destructor close the file
// Closing it explicitly may crash on Win32 ...
wxFFile file(filename, wxS("rbS"));
if (! file.IsOpened())
{
return wxEmptyString;
}
else
{
unsigned char ret[MD4_HASHLEN_BYTE];
unsigned int bufSize = calcBufSize(file.Length());
char *buf = new char[bufSize];
bool keep_going = true;
size_t totalread = 0;
bool goAhead = true;
MD4Init(&hdc);
while (!file.Eof() && keep_going)
{
if (hook)
{
goAhead = hook( (int)((double)(100.0 * totalread) / file.Length()));
}
if (goAhead)
{
size_t read = file.Read(buf, bufSize);
MD4Update(&hdc, reinterpret_cast<unsigned char const *>(buf),
read );
totalread += read;
}
else
{
delete [] buf;
return (_("Cancelled !"));
}
}
MD4Final(&hdc, ret);
delete [] buf;
return charToHex(reinterpret_cast<const char *>(ret),
MD4_HASHLEN_BYTE);
}
}
/// Convert hash to hexa string
wxString MD4::charToHex(const char *buf, size_t len)
{
size_t i;
wxString hexString;
for (i = 0; i < len; ++i)
{
hexString += wxString::Format(wxS("%02x"), 0xFF & *(buf + i));
}
// Reduce memory usage
hexString.Shrink();
return (hexString);
}
/// Compute Md4 buffsize
size_t MD4::calcBufSize(size_t filesize)
{
if (filesize < 100000)
{
filesize = 100000;
}
else if (filesize > 200000)
{
filesize = 200000;
}
return (filesize);
}
// File_checked_for_headers
|