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wine/dlls/ntdll/crypt.c
Alexandre Julliard d5249c0f6d advapi32: Move MD5 implementation to ntdll. 
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
2019-06-24 15:00:29 +02:00

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/*
* Copyright 2001 Nikos Mavroyanopoulos
* Copyright 2004 Hans Leidekker
* Copyright 2004 Filip Navara
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include "windef.h"
/* SHA1 algorithm
*
* Based on public domain SHA code by Steve Reid <steve@edmweb.com>
*/
typedef struct {
ULONG Unknown[6];
ULONG State[5];
ULONG Count[2];
UCHAR Buffer[64];
} SHA_CTX, *PSHA_CTX;
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
/* FIXME: This definition of DWORD2BE is little endian specific! */
#define DWORD2BE(x) (((x) >> 24) & 0xff) | (((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000);
/* FIXME: This definition of blk0 is little endian specific! */
#define blk0(i) (Block[i] = (rol(Block[i],24)&0xFF00FF00)|(rol(Block[i],8)&0x00FF00FF))
#define blk1(i) (Block[i&15] = rol(Block[(i+13)&15]^Block[(i+8)&15]^Block[(i+2)&15]^Block[i&15],1))
#define f1(x,y,z) (z^(x&(y^z)))
#define f2(x,y,z) (x^y^z)
#define f3(x,y,z) ((x&y)|(z&(x|y)))
#define f4(x,y,z) (x^y^z)
/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define R0(v,w,x,y,z,i) z+=f1(w,x,y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=f1(w,x,y)+blk1(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=f2(w,x,y)+blk1(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=f3(w,x,y)+blk1(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=f4(w,x,y)+blk1(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
/* Hash a single 512-bit block. This is the core of the algorithm. */
static void SHA1Transform(ULONG State[5], UCHAR Buffer[64])
{
ULONG a, b, c, d, e;
ULONG *Block;
Block = (ULONG*)Buffer;
/* Copy Context->State[] to working variables */
a = State[0];
b = State[1];
c = State[2];
d = State[3];
e = State[4];
/* 4 rounds of 20 operations each. Loop unrolled. */
R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
/* Add the working variables back into Context->State[] */
State[0] += a;
State[1] += b;
State[2] += c;
State[3] += d;
State[4] += e;
/* Wipe variables */
a = b = c = d = e = 0;
}
/******************************************************************************
* A_SHAInit (ntdll.@)
*
* Initialize a SHA context structure.
*
* PARAMS
* Context [O] SHA context
*
* RETURNS
* Nothing
*/
void WINAPI A_SHAInit(PSHA_CTX Context)
{
/* SHA1 initialization constants */
Context->State[0] = 0x67452301;
Context->State[1] = 0xEFCDAB89;
Context->State[2] = 0x98BADCFE;
Context->State[3] = 0x10325476;
Context->State[4] = 0xC3D2E1F0;
Context->Count[0] =
Context->Count[1] = 0;
}
/******************************************************************************
* A_SHAUpdate (ntdll.@)
*
* Update a SHA context with a hashed data from supplied buffer.
*
* PARAMS
* Context [O] SHA context
* Buffer [I] hashed data
* BufferSize [I] hashed data size
*
* RETURNS
* Nothing
*/
void WINAPI A_SHAUpdate(PSHA_CTX Context, const unsigned char *Buffer, UINT BufferSize)
{
ULONG BufferContentSize;
BufferContentSize = Context->Count[1] & 63;
Context->Count[1] += BufferSize;
if (Context->Count[1] < BufferSize)
Context->Count[0]++;
Context->Count[0] += (BufferSize >> 29);
if (BufferContentSize + BufferSize < 64)
{
RtlCopyMemory(&Context->Buffer[BufferContentSize], Buffer,
BufferSize);
}
else
{
while (BufferContentSize + BufferSize >= 64)
{
RtlCopyMemory(Context->Buffer + BufferContentSize, Buffer,
64 - BufferContentSize);
Buffer += 64 - BufferContentSize;
BufferSize -= 64 - BufferContentSize;
SHA1Transform(Context->State, Context->Buffer);
BufferContentSize = 0;
}
RtlCopyMemory(Context->Buffer + BufferContentSize, Buffer, BufferSize);
}
}
/******************************************************************************
* A_SHAFinal (ntdll.@)
*
* Finalize SHA context and return the resulting hash.
*
* PARAMS
* Context [I/O] SHA context
* Result [O] resulting hash
*
* RETURNS
* Nothing
*/
void WINAPI A_SHAFinal(PSHA_CTX Context, PULONG Result)
{
INT Pad, Index;
UCHAR Buffer[72];
ULONG *Count;
ULONG BufferContentSize, LengthHi, LengthLo;
BufferContentSize = Context->Count[1] & 63;
if (BufferContentSize >= 56)
Pad = 56 + 64 - BufferContentSize;
else
Pad = 56 - BufferContentSize;
LengthHi = (Context->Count[0] << 3) | (Context->Count[1] >> (32 - 3));
LengthLo = (Context->Count[1] << 3);
RtlZeroMemory(Buffer + 1, Pad - 1);
Buffer[0] = 0x80;
Count = (ULONG*)(Buffer + Pad);
Count[0] = DWORD2BE(LengthHi);
Count[1] = DWORD2BE(LengthLo);
A_SHAUpdate(Context, Buffer, Pad + 8);
for (Index = 0; Index < 5; Index++)
Result[Index] = DWORD2BE(Context->State[Index]);
A_SHAInit(Context);
}
/* MD4 algorithm
*
* This code implements the MD4 message-digest algorithm.
* It is based on code in the public domain written by Colin
* Plumb in 1993. The algorithm is due to Ron Rivest.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*/
typedef struct
{
unsigned int buf[4];
unsigned int i[2];
unsigned char in[64];
unsigned char digest[16];
} MD4_CTX;
#define F( x, y, z ) (((x) & (y)) | ((~x) & (z)))
#define G( x, y, z ) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define H( x, y, z ) ((x) ^ (y) ^ (z))
#define FF( a, b, c, d, x, s ) { \
(a) += F( (b), (c), (d) ) + (x); \
(a) = rol( (a), (s) ); \
}
#define GG( a, b, c, d, x, s ) { \
(a) += G( (b), (c), (d) ) + (x) + (unsigned int)0x5a827999; \
(a) = rol( (a), (s) ); \
}
#define HH( a, b, c, d, x, s ) { \
(a) += H( (b), (c), (d) ) + (x) + (unsigned int)0x6ed9eba1; \
(a) = rol( (a), (s) ); \
}
static void MD4Transform( unsigned int buf[4], const unsigned int in[16] )
{
unsigned int a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
FF( a, b, c, d, in[0], 3 );
FF( d, a, b, c, in[1], 7 );
FF( c, d, a, b, in[2], 11 );
FF( b, c, d, a, in[3], 19 );
FF( a, b, c, d, in[4], 3 );
FF( d, a, b, c, in[5], 7 );
FF( c, d, a, b, in[6], 11 );
FF( b, c, d, a, in[7], 19 );
FF( a, b, c, d, in[8], 3 );
FF( d, a, b, c, in[9], 7 );
FF( c, d, a, b, in[10], 11 );
FF( b, c, d, a, in[11], 19 );
FF( a, b, c, d, in[12], 3 );
FF( d, a, b, c, in[13], 7 );
FF( c, d, a, b, in[14], 11 );
FF( b, c, d, a, in[15], 19 );
GG( a, b, c, d, in[0], 3 );
GG( d, a, b, c, in[4], 5 );
GG( c, d, a, b, in[8], 9 );
GG( b, c, d, a, in[12], 13 );
GG( a, b, c, d, in[1], 3 );
GG( d, a, b, c, in[5], 5 );
GG( c, d, a, b, in[9], 9 );
GG( b, c, d, a, in[13], 13 );
GG( a, b, c, d, in[2], 3 );
GG( d, a, b, c, in[6], 5 );
GG( c, d, a, b, in[10], 9 );
GG( b, c, d, a, in[14], 13 );
GG( a, b, c, d, in[3], 3 );
GG( d, a, b, c, in[7], 5 );
GG( c, d, a, b, in[11], 9 );
GG( b, c, d, a, in[15], 13 );
HH( a, b, c, d, in[0], 3 );
HH( d, a, b, c, in[8], 9 );
HH( c, d, a, b, in[4], 11 );
HH( b, c, d, a, in[12], 15 );
HH( a, b, c, d, in[2], 3 );
HH( d, a, b, c, in[10], 9 );
HH( c, d, a, b, in[6], 11 );
HH( b, c, d, a, in[14], 15 );
HH( a, b, c, d, in[1], 3 );
HH( d, a, b, c, in[9], 9 );
HH( c, d, a, b, in[5], 11 );
HH( b, c, d, a, in[13], 15 );
HH( a, b, c, d, in[3], 3 );
HH( d, a, b, c, in[11], 9 );
HH( c, d, a, b, in[7], 11 );
HH( b, c, d, a, in[15], 15 );
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
/*
* Note: this code is harmless on little-endian machines.
*/
static void byteReverse( unsigned char *buf, unsigned longs )
{
unsigned int t;
do {
t = ((unsigned)buf[3] << 8 | buf[2]) << 16 |
((unsigned)buf[1] << 8 | buf[0]);
*(unsigned int *)buf = t;
buf += 4;
} while (--longs);
}
/******************************************************************************
* MD4Init (ntdll.@)
*
* Start MD4 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
void WINAPI MD4Init( MD4_CTX *ctx )
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->i[0] = ctx->i[1] = 0;
}
/******************************************************************************
* MD4Update (ntdll.@)
*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void WINAPI MD4Update( MD4_CTX *ctx, const unsigned char *buf, unsigned int len )
{
unsigned int t;
/* Update bitcount */
t = ctx->i[0];
if ((ctx->i[0] = t + (len << 3)) < t)
ctx->i[1]++; /* Carry from low to high */
ctx->i[1] += len >> 29;
t = (t >> 3) & 0x3f;
/* Handle any leading odd-sized chunks */
if (t)
{
unsigned char *p = (unsigned char *)ctx->in + t;
t = 64 - t;
if (len < t)
{
memcpy( p, buf, len );
return;
}
memcpy( p, buf, t );
byteReverse( ctx->in, 16 );
MD4Transform( ctx->buf, (unsigned int *)ctx->in );
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, (unsigned int *)ctx->in );
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy( ctx->in, buf, len );
}
/******************************************************************************
* MD4Final (ntdll.@)
*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
void WINAPI MD4Final( MD4_CTX *ctx )
{
unsigned int count;
unsigned char *p;
/* Compute number of bytes mod 64 */
count = (ctx->i[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, (unsigned int *)ctx->in );
/* 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 */
((unsigned int *)ctx->in)[14] = ctx->i[0];
((unsigned int *)ctx->in)[15] = ctx->i[1];
MD4Transform( ctx->buf, (unsigned int *)ctx->in );
byteReverse( (unsigned char *)ctx->buf, 4 );
memcpy( ctx->digest, ctx->buf, 16 );
}
/* MD5 algorithm
*
* This code implements the MD5 message-digest algorithm.
* It is based on code in the public domain written by Colin
* Plumb in 1993. The algorithm is due to Ron Rivest.
*
* Equivalent code is available from RSA Data Security, Inc.
* This code has been tested against that, and is equivalent,
* except that you don't need to include two pages of legalese
* with every copy.
*/
typedef struct
{
unsigned int i[2];
unsigned int buf[4];
unsigned char in[64];
unsigned char digest[16];
} MD5_CTX;
/* #define F1( x, y, z ) (x & y | ~x & z) */
#define F1( x, y, z ) (z ^ (x & (y ^ z)))
#define F2( x, y, z ) F1( z, x, y )
#define F3( x, y, z ) (x ^ y ^ z)
#define F4( x, y, z ) (y ^ (x | ~z))
/* This is the central step in the MD5 algorithm. */
#define MD5STEP( f, w, x, y, z, data, s ) \
( w += f( x, y, z ) + data, w = w << s | w >> (32 - s), w += x )
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. MD5Update blocks
* the data and converts bytes into longwords for this routine.
*/
static void MD5Transform( unsigned int buf[4], const unsigned int in[16] )
{
unsigned int a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP( F1, a, b, c, d, in[0] + 0xd76aa478, 7 );
MD5STEP( F1, d, a, b, c, in[1] + 0xe8c7b756, 12 );
MD5STEP( F1, c, d, a, b, in[2] + 0x242070db, 17 );
MD5STEP( F1, b, c, d, a, in[3] + 0xc1bdceee, 22 );
MD5STEP( F1, a, b, c, d, in[4] + 0xf57c0faf, 7 );
MD5STEP( F1, d, a, b, c, in[5] + 0x4787c62a, 12 );
MD5STEP( F1, c, d, a, b, in[6] + 0xa8304613, 17 );
MD5STEP( F1, b, c, d, a, in[7] + 0xfd469501, 22 );
MD5STEP( F1, a, b, c, d, in[8] + 0x698098d8, 7 );
MD5STEP( F1, d, a, b, c, in[9] + 0x8b44f7af, 12 );
MD5STEP( F1, c, d, a, b, in[10] + 0xffff5bb1, 17 );
MD5STEP( F1, b, c, d, a, in[11] + 0x895cd7be, 22 );
MD5STEP( F1, a, b, c, d, in[12] + 0x6b901122, 7 );
MD5STEP( F1, d, a, b, c, in[13] + 0xfd987193, 12 );
MD5STEP( F1, c, d, a, b, in[14] + 0xa679438e, 17 );
MD5STEP( F1, b, c, d, a, in[15] + 0x49b40821, 22 );
MD5STEP( F2, a, b, c, d, in[1] + 0xf61e2562, 5 );
MD5STEP( F2, d, a, b, c, in[6] + 0xc040b340, 9 );
MD5STEP( F2, c, d, a, b, in[11] + 0x265e5a51, 14 );
MD5STEP( F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20 );
MD5STEP( F2, a, b, c, d, in[5] + 0xd62f105d, 5 );
MD5STEP( F2, d, a, b, c, in[10] + 0x02441453, 9 );
MD5STEP( F2, c, d, a, b, in[15] + 0xd8a1e681, 14 );
MD5STEP( F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20 );
MD5STEP( F2, a, b, c, d, in[9] + 0x21e1cde6, 5 );
MD5STEP( F2, d, a, b, c, in[14] + 0xc33707d6, 9 );
MD5STEP( F2, c, d, a, b, in[3] + 0xf4d50d87, 14 );
MD5STEP( F2, b, c, d, a, in[8] + 0x455a14ed, 20 );
MD5STEP( F2, a, b, c, d, in[13] + 0xa9e3e905, 5 );
MD5STEP( F2, d, a, b, c, in[2] + 0xfcefa3f8, 9 );
MD5STEP( F2, c, d, a, b, in[7] + 0x676f02d9, 14 );
MD5STEP( F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20 );
MD5STEP( F3, a, b, c, d, in[5] + 0xfffa3942, 4 );
MD5STEP( F3, d, a, b, c, in[8] + 0x8771f681, 11 );
MD5STEP( F3, c, d, a, b, in[11] + 0x6d9d6122, 16 );
MD5STEP( F3, b, c, d, a, in[14] + 0xfde5380c, 23 );
MD5STEP( F3, a, b, c, d, in[1] + 0xa4beea44, 4 );
MD5STEP( F3, d, a, b, c, in[4] + 0x4bdecfa9, 11 );
MD5STEP( F3, c, d, a, b, in[7] + 0xf6bb4b60, 16 );
MD5STEP( F3, b, c, d, a, in[10] + 0xbebfbc70, 23 );
MD5STEP( F3, a, b, c, d, in[13] + 0x289b7ec6, 4 );
MD5STEP( F3, d, a, b, c, in[0] + 0xeaa127fa, 11 );
MD5STEP( F3, c, d, a, b, in[3] + 0xd4ef3085, 16 );
MD5STEP( F3, b, c, d, a, in[6] + 0x04881d05, 23 );
MD5STEP( F3, a, b, c, d, in[9] + 0xd9d4d039, 4 );
MD5STEP( F3, d, a, b, c, in[12] + 0xe6db99e5, 11 );
MD5STEP( F3, c, d, a, b, in[15] + 0x1fa27cf8, 16 );
MD5STEP( F3, b, c, d, a, in[2] + 0xc4ac5665, 23 );
MD5STEP( F4, a, b, c, d, in[0] + 0xf4292244, 6 );
MD5STEP( F4, d, a, b, c, in[7] + 0x432aff97, 10 );
MD5STEP( F4, c, d, a, b, in[14] + 0xab9423a7, 15 );
MD5STEP( F4, b, c, d, a, in[5] + 0xfc93a039, 21 );
MD5STEP( F4, a, b, c, d, in[12] + 0x655b59c3, 6 );
MD5STEP( F4, d, a, b, c, in[3] + 0x8f0ccc92, 10 );
MD5STEP( F4, c, d, a, b, in[10] + 0xffeff47d, 15 );
MD5STEP( F4, b, c, d, a, in[1] + 0x85845dd1, 21 );
MD5STEP( F4, a, b, c, d, in[8] + 0x6fa87e4f, 6 );
MD5STEP( F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10 );
MD5STEP( F4, c, d, a, b, in[6] + 0xa3014314, 15 );
MD5STEP( F4, b, c, d, a, in[13] + 0x4e0811a1, 21 );
MD5STEP( F4, a, b, c, d, in[4] + 0xf7537e82, 6 );
MD5STEP( F4, d, a, b, c, in[11] + 0xbd3af235, 10 );
MD5STEP( F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15 );
MD5STEP( F4, b, c, d, a, in[9] + 0xeb86d391, 21 );
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
/******************************************************************************
* MD5Init (ntdll.@)
*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
void WINAPI MD5Init( MD5_CTX *ctx )
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->i[0] = ctx->i[1] = 0;
}
/******************************************************************************
* MD5Update (ntdll.@)
*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void WINAPI MD5Update( MD5_CTX *ctx, const unsigned char *buf, unsigned int len )
{
register unsigned int t;
/* Update bitcount */
t = ctx->i[0];
if ((ctx->i[0] = t + (len << 3)) < t)
ctx->i[1]++; /* Carry from low to high */
ctx->i[1] += len >> 29;
t = (t >> 3) & 0x3f;
/* Handle any leading odd-sized chunks */
if (t)
{
unsigned char *p = (unsigned char *)ctx->in + t;
t = 64 - t;
if (len < t)
{
memcpy( p, buf, len );
return;
}
memcpy( p, buf, t );
byteReverse( ctx->in, 16 );
MD5Transform( ctx->buf, (unsigned int *)ctx->in );
buf += t;
len -= t;
}
/* Process data in 64-byte chunks */
while (len >= 64)
{
memcpy( ctx->in, buf, 64 );
byteReverse( ctx->in, 16 );
MD5Transform( ctx->buf, (unsigned int *)ctx->in );
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy( ctx->in, buf, len );
}
/******************************************************************************
* MD5Final (ntdll.@)
*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
void WINAPI MD5Final( MD5_CTX *ctx )
{
unsigned int count;
unsigned char *p;
/* Compute number of bytes mod 64 */
count = (ctx->i[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 );
MD5Transform( ctx->buf, (unsigned int *)ctx->in );
/* 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 */
((unsigned int *)ctx->in)[14] = ctx->i[0];
((unsigned int *)ctx->in)[15] = ctx->i[1];
MD5Transform( ctx->buf, (unsigned int *)ctx->in );
byteReverse( (unsigned char *)ctx->buf, 4 );
memcpy( ctx->digest, ctx->buf, 16 );
}
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