/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/*
** Copyright (c) 2013 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
**
** 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.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
*/
#include "fossil/fossil.h"
#include <assert.h>
#include <string.h> /* strlen() */
#include <stddef.h> /* NULL on linux */
#include <sys/types.h>
/*
** The SHA1 implementation below is adapted from:
**
** $NetBSD: sha1.c,v 1.6 2009/11/06 20:31:18 joerg Exp $
** $OpenBSD: sha1.c,v 1.9 1997/07/23 21:12:32 kstailey Exp $
**
** SHA-1 in C
** By Steve Reid <steve@edmweb.com>
** 100% Public Domain
*/
/*
* blk0() and blk() perform the initial expand.
* I got the idea of expanding during the round function from SSLeay
*
* blk0le() for little-endian and blk0be() for big-endian.
*/
#if 0 && __GNUC__ && (defined(__i386__) || defined(__x86_64__))
/*
* GCC by itself only generates left rotates. Use right rotates if
* possible to be kinder to dinky implementations with iterative rotate
* instructions.
*/
#define SHA_ROT(op, x, k) \
({ unsigned int y; asm(op " %1,%0" : "=r" (y) : "I" (k), "0" (x)); y; })
#define rol(x,k) SHA_ROT("roll", x, k)
#define ror(x,k) SHA_ROT("rorl", x, k)
#else
/* Generic C equivalent */
#define SHA_ROT(x,l,r) ((x) << (l) | (x) >> (r))
#define rol(x,k) SHA_ROT(x,k,32-(k))
#define ror(x,k) SHA_ROT(x,32-(k),k)
#endif
#define blk0le(i) (block[i] = (ror(block[i],8)&0xFF00FF00) \
|(rol(block[i],8)&0x00FF00FF))
#define blk0be(i) block[i]
#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15] \
^block[(i+2)&15]^block[i&15],1))
/*
* (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
*
* Rl0() for little-endian and Rb0() for big-endian. Endianness is
* determined at run-time.
*/
#define Rl0(v,w,x,y,z,i) \
z+=((w&(x^y))^y)+blk0le(i)+0x5A827999+rol(v,5);w=ror(w,2);
#define Rb0(v,w,x,y,z,i) \
z+=((w&(x^y))^y)+blk0be(i)+0x5A827999+rol(v,5);w=ror(w,2);
#define R1(v,w,x,y,z,i) \
z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=ror(w,2);
#define R2(v,w,x,y,z,i) \
z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=ror(w,2);
#define R3(v,w,x,y,z,i) \
z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=ror(w,2);
#define R4(v,w,x,y,z,i) \
z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=ror(w,2);
/*
* Hash a single 512-bit block. This is the core of the algorithm.
*/
#define a qq[0]
#define b qq[1]
#define c qq[2]
#define d qq[3]
#define e qq[4]
static void SHA1Transform(unsigned int state[5], const unsigned char buffer[64])
{
unsigned int qq[5]; /* a, b, c, d, e; */
static int one = 1;
unsigned int block[16];
memcpy(block, buffer, 64);
memcpy(qq,state,5*sizeof(unsigned int));
/* Copy context->state[] to working vars */
/*
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
*/
/* 4 rounds of 20 operations each. Loop unrolled. */
if( 1 == *(unsigned char*)&one ){
Rl0(a,b,c,d,e, 0); Rl0(e,a,b,c,d, 1); Rl0(d,e,a,b,c, 2); Rl0(c,d,e,a,b, 3);
Rl0(b,c,d,e,a, 4); Rl0(a,b,c,d,e, 5); Rl0(e,a,b,c,d, 6); Rl0(d,e,a,b,c, 7);
Rl0(c,d,e,a,b, 8); Rl0(b,c,d,e,a, 9); Rl0(a,b,c,d,e,10); Rl0(e,a,b,c,d,11);
Rl0(d,e,a,b,c,12); Rl0(c,d,e,a,b,13); Rl0(b,c,d,e,a,14); Rl0(a,b,c,d,e,15);
}else{
Rb0(a,b,c,d,e, 0); Rb0(e,a,b,c,d, 1); Rb0(d,e,a,b,c, 2); Rb0(c,d,e,a,b, 3);
Rb0(b,c,d,e,a, 4); Rb0(a,b,c,d,e, 5); Rb0(e,a,b,c,d, 6); Rb0(d,e,a,b,c, 7);
Rb0(c,d,e,a,b, 8); Rb0(b,c,d,e,a, 9); Rb0(a,b,c,d,e,10); Rb0(e,a,b,c,d,11);
Rb0(d,e,a,b,c,12); Rb0(c,d,e,a,b,13); Rb0(b,c,d,e,a,14); Rb0(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 vars back into context.state[] */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
}
void fsl_sha1_init(fsl_sha1_cx *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;
}
/*
* Run your data through this.
*/
void fsl_sha1_update(
fsl_sha1_cx *context,
const unsigned char *data,
unsigned int len
){
unsigned int i, j;
j = context->count[0];
if ((context->count[0] += len << 3) < j)
context->count[1] += (len>>29)+1;
j = (j >> 3) & 63;
if ((j + len) > 63) {
(void)memcpy(&context->buffer[j], data, (i = 64-j));
SHA1Transform(context->state, context->buffer);
for ( ; i + 63 < len; i += 64)
SHA1Transform(context->state, &data[i]);
j = 0;
} else {
i = 0;
}
(void)memcpy(&context->buffer[j], &data[i], len - i);
}
void fsl_sha1_final(fsl_sha1_cx *context, unsigned char * digest){
unsigned int i;
unsigned char finalcount[8];
for (i = 0; i < 8; i++) {
finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
>> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
}
fsl_sha1_update(context, (const unsigned char *)"\200", 1);
while ((context->count[0] & 504) != 448){
fsl_sha1_update(context, (const unsigned char *)"\0", 1);
}
fsl_sha1_update(context, finalcount, 8); /* Should cause a SHA1Transform() */
if (digest) {
for (i = 0; i < 20; i++){
digest[i] = (unsigned char)
((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
}
}
/*
** Convert a digest into base-16. digest should be declared as
** "unsigned char digest[20]" in the calling function. The SHA1
** digest is stored in the first 20 bytes. zBuf should
** be "char zBuf[41]".
*/
void fsl_sha1_digest_to_base16(unsigned char *digest, char *zBuf){
static char const zEncode[] = "0123456789abcdef";
int ix;
for(ix=0; ix<20; ix++){
*zBuf++ = zEncode[(*digest>>4)&0xf];
*zBuf++ = zEncode[*digest++ & 0xf];
}
*zBuf = '\0';
}
/*
** The state of a incremental SHA1 checksum computation. Only one
** such computation can be underway at a time, of course.
*/
/* static fsl_sha1_cx incrCtx; */
#if 0
/*
** Add more text to the incremental SHA1 checksum.
*/
static void fsl_sha1sum_step_text(fsl_sha1_cx * cx, const char *zText, int nBytes){
if( nBytes<=0 ){
if( nBytes==0 ) return;
nBytes = fsl_strlen(zText);
}
fsl_sha1_update(cx, (unsigned char*)zText, nBytes);
}
#endif
#if 0
/*
** Add the content of a blob to the incremental SHA1 checksum.
*/
static void fsl_sha1sum_step_buffer(fsl_sha1_cx * cx, fsl_buffer *b){
fsl_sha1sum_step_text(cx, fsl_buffer_cstr(b), b->used);
}
#endif
int fsl_sha1sum_file(const char *zFilename, fsl_buffer *pCksum){
if(!zFilename || !pCksum) return FSL_RC_MISUSE;
else{
#if 1
return FSL_RC_NYI;
#else
/* Requires v1 code which has not yet been ported in. */
FILE *in;
fsl_sha1_cx ctx;
unsigned char zResult[20];
char zBuf[10240];
if( fsl_file_wd_islink(zFilename) ){
/* Instead of file content, return sha1 of link destination path */
Blob destinationPath;
int rc;
blob_read_link(&destinationPath, zFilename);
rc = sha1sum_blob(&destinationPath, pCksum);
blob_reset(&destinationPath);
return rc;
}
in = fossil_fopen(zFilename,"rb");
if( in==0 ){
return 1;
}
fsl_sha1_init(&ctx);
for(;;){
int n;
n = fread(zBuf, 1, sizeof(zBuf), in);
if( n<=0 ) break;
fsl_sha1_update(&ctx, (unsigned char*)zBuf, (unsigned)n);
}
fclose(in);
blob_zero(pCksum);
blob_resize(pCksum, 40);
fsl_sha1_final(&ctx, zResult);
fsl_sha1_digest_to_base16(zResult, blob_buffer(pCksum));
return 0;
#endif
}
}
int fsl_sha1sum_buffer(fsl_buffer const *pIn, fsl_buffer *pCksum){
if(!pIn || !pCksum) return FSL_RC_MISUSE;
else{
fsl_sha1_cx ctx;
unsigned char zResult[20];
int rc;
fsl_sha1_init(&ctx);
fsl_sha1_update(&ctx, pIn->mem, pIn->used);
fsl_buffer_reset(pCksum);
rc = fsl_buffer_resize(pCksum, 40/*resize() adds 1 for NUL*/);
if(!rc){
fsl_sha1_final(&ctx, zResult);
fsl_sha1_digest_to_base16(zResult, fsl_buffer_str(pCksum));
}
return rc;
}
}
char *fsl_sha1sum_cstr(const char *zIn, int len){
if(!zIn || !len) return NULL;
else{
fsl_sha1_cx ctx;
unsigned char zResult[20];
char * zDigest = (char *)fsl_malloc(41);
if(!zDigest) return NULL;
fsl_sha1_init(&ctx);
fsl_sha1_update(&ctx, (unsigned const char*)zIn,
(len<0) ? fsl_strlen(zIn) : (fsl_size_t)len);
fsl_sha1_final(&ctx, zResult);
fsl_sha1_digest_to_base16(zResult, zDigest);
return zDigest;
}
}
#undef SHA_ROT
#undef rol
#undef ror
#undef blk0le
#undef blk0be
#undef blk
#undef Rl0
#undef Rb0
#undef R1
#undef R2
#undef R3
#undef R4
#undef a
#undef b
#undef c
#undef d
#undef e