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209 lines
6.9 KiB
C
209 lines
6.9 KiB
C
/*
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* Copyright 2004 Filip Navara
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* Based on public domain SHA code by Steve Reid <steve@edmweb.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdarg.h>
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#include "windef.h"
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/* SHA Context Structure Declaration */
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typedef struct {
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ULONG Unknown[6];
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ULONG State[5];
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ULONG Count[2];
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UCHAR Buffer[64];
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} SHA_CTX, *PSHA_CTX;
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/* SHA1 Helper Macros */
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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/* FIXME: This definition of DWORD2BE is little endian specific! */
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#define DWORD2BE(x) (((x) >> 24) & 0xff) | (((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000);
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/* FIXME: This definition of blk0 is little endian specific! */
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#define blk0(i) (Block[i] = (rol(Block[i],24)&0xFF00FF00)|(rol(Block[i],8)&0x00FF00FF))
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#define blk1(i) (Block[i&15] = rol(Block[(i+13)&15]^Block[(i+8)&15]^Block[(i+2)&15]^Block[i&15],1))
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#define f1(x,y,z) (z^(x&(y^z)))
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#define f2(x,y,z) (x^y^z)
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#define f3(x,y,z) ((x&y)|(z&(x|y)))
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#define f4(x,y,z) (x^y^z)
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/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
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#define R0(v,w,x,y,z,i) z+=f1(w,x,y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R1(v,w,x,y,z,i) z+=f1(w,x,y)+blk1(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R2(v,w,x,y,z,i) z+=f2(w,x,y)+blk1(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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#define R3(v,w,x,y,z,i) z+=f3(w,x,y)+blk1(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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#define R4(v,w,x,y,z,i) z+=f4(w,x,y)+blk1(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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/* Hash a single 512-bit block. This is the core of the algorithm. */
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void SHA1Transform(ULONG State[5], UCHAR Buffer[64])
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{
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ULONG a, b, c, d, e;
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ULONG *Block;
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Block = (ULONG*)Buffer;
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/* Copy Context->State[] to working variables */
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a = State[0];
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b = State[1];
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c = State[2];
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d = State[3];
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e = State[4];
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/* 4 rounds of 20 operations each. Loop unrolled. */
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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/* Add the working variables back into Context->State[] */
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State[0] += a;
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State[1] += b;
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State[2] += c;
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State[3] += d;
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State[4] += e;
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/* Wipe variables */
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a = b = c = d = e = 0;
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}
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/******************************************************************************
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* A_SHAInit [ADVAPI32.@]
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*
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* Initialize a SHA context structure.
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*
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* PARAMS
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* Context [O] SHA context
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*
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* RETURNS
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* Nothing
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*/
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VOID WINAPI
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A_SHAInit(PSHA_CTX Context)
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{
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/* SHA1 initialization constants */
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Context->State[0] = 0x67452301;
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Context->State[1] = 0xEFCDAB89;
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Context->State[2] = 0x98BADCFE;
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Context->State[3] = 0x10325476;
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Context->State[4] = 0xC3D2E1F0;
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Context->Count[0] =
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Context->Count[1] = 0;
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}
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/******************************************************************************
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* A_SHAUpdate [ADVAPI32.@]
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*
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* Update a SHA context with a hashed data from supplied buffer.
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*
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* PARAMS
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* Context [O] SHA context
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* Buffer [I] hashed data
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* BufferSize [I] hashed data size
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*
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* RETURNS
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* Nothing
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*/
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VOID WINAPI
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A_SHAUpdate(PSHA_CTX Context, PCHAR Buffer, UINT BufferSize)
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{
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ULONG BufferContentSize;
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BufferContentSize = Context->Count[1] & 63;
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Context->Count[1] += BufferSize;
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if (Context->Count[1] < BufferSize)
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Context->Count[0]++;
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Context->Count[0] += (BufferSize >> 29);
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if (BufferContentSize + BufferSize < 64)
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{
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RtlCopyMemory(&Context->Buffer[BufferContentSize], Buffer,
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BufferSize);
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}
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else
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{
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while (BufferContentSize + BufferSize >= 64)
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{
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RtlCopyMemory(Context->Buffer + BufferContentSize, Buffer,
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64 - BufferContentSize);
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Buffer += 64 - BufferContentSize;
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BufferSize -= 64 - BufferContentSize;
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SHA1Transform(Context->State, Context->Buffer);
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BufferContentSize = 0;
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}
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RtlCopyMemory(Context->Buffer + BufferContentSize, Buffer, BufferSize);
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}
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}
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/******************************************************************************
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* A_SHAFinal [ADVAPI32.@]
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*
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* Finalize SHA context and return the resulting hash.
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*
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* PARAMS
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* Context [I/O] SHA context
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* Result [O] resulting hash
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*
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* RETURNS
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* Nothing
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*/
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VOID WINAPI
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A_SHAFinal(PSHA_CTX Context, PULONG Result)
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{
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INT Pad, Index;
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UCHAR Buffer[72];
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ULONG *Count;
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ULONG BufferContentSize, LengthHi, LengthLo;
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BufferContentSize = Context->Count[1] & 63;
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if (BufferContentSize >= 56)
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Pad = 56 + 64 - BufferContentSize;
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else
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Pad = 56 - BufferContentSize;
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LengthHi = (Context->Count[0] << 3) | (Context->Count[1] >> (32 - 3));
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LengthLo = (Context->Count[1] << 3);
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RtlZeroMemory(Buffer + 1, Pad - 1);
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Buffer[0] = 0x80;
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Count = (ULONG*)(Buffer + Pad);
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Count[0] = DWORD2BE(LengthHi);
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Count[1] = DWORD2BE(LengthLo);
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A_SHAUpdate(Context, (PCHAR)Buffer, Pad + 8);
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for (Index = 0; Index < 5; Index++)
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Result[Index] = DWORD2BE(Context->State[Index]);
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A_SHAInit(Context);
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}
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