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reactos/sdk/lib/cryptlib/sha1.c

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/*
* Copyright 2004 Filip Navara
* Based on public domain SHA code by Steve Reid <steve@edmweb.com>
*
* 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 "sha1.h"
/* SHA1 Helper Macros */
#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 [ADVAPI32.@]
*
* Initialize a SHA context structure.
*
* PARAMS
* Context [O] SHA context
*
* RETURNS
* Nothing
*/
VOID NTAPI
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 [ADVAPI32.@]
*
* 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 NTAPI
A_SHAUpdate(PSHA_CTX Context, const unsigned char *Buffer, ULONG 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)
{
memcpy(&Context->Buffer[BufferContentSize], Buffer,
BufferSize);
}
else
{
while (BufferContentSize + BufferSize >= 64)
{
memcpy(Context->Buffer + BufferContentSize, Buffer,
64 - BufferContentSize);
Buffer += 64 - BufferContentSize;
BufferSize -= 64 - BufferContentSize;
SHA1Transform(Context->State, Context->Buffer);
BufferContentSize = 0;
}
memcpy(Context->Buffer + BufferContentSize, Buffer, BufferSize);
}
}
/******************************************************************************
* A_SHAFinal [ADVAPI32.@]
*
* Finalize SHA context and return the resulting hash.
*
* PARAMS
* Context [I/O] SHA context
* Result [O] resulting hash
*
* RETURNS
* Nothing
*/
VOID NTAPI
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);
memset(Buffer + 1, 0, 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);
}
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