mirror of
https://github.com/sheumann/hush.git
synced 2024-08-19 13:28:57 +00:00
493 lines
14 KiB
C
493 lines
14 KiB
C
/*
|
|
* Based on shasum from http://www.netsw.org/crypto/hash/
|
|
* Majorly hacked up to use Dr Brian Gladman's sha1 code
|
|
*
|
|
* Copyright (C) 1999 Scott G. Miller
|
|
* Copyright (C) 2003 Glenn L. McGrath
|
|
* Copyright (C) 2003 Erik Andersen
|
|
*
|
|
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <getopt.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
#include <endian.h>
|
|
#include <byteswap.h>
|
|
#include "busybox.h"
|
|
|
|
|
|
/*
|
|
---------------------------------------------------------------------------
|
|
Begin Dr. Gladman's sha1 code
|
|
---------------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
---------------------------------------------------------------------------
|
|
Copyright (c) 2002, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
|
|
All rights reserved.
|
|
|
|
LICENSE TERMS
|
|
|
|
The free distribution and use of this software in both source and binary
|
|
form is allowed (with or without changes) provided that:
|
|
|
|
1. distributions of this source code include the above copyright
|
|
notice, this list of conditions and the following disclaimer;
|
|
|
|
2. distributions in binary form include the above copyright
|
|
notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other associated materials;
|
|
|
|
3. the copyright holder's name is not used to endorse products
|
|
built using this software without specific written permission.
|
|
|
|
ALTERNATIVELY, provided that this notice is retained in full, this product
|
|
may be distributed under the terms of the GNU General Public License (GPL),
|
|
in which case the provisions of the GPL apply INSTEAD OF those given above.
|
|
|
|
DISCLAIMER
|
|
|
|
This software is provided 'as is' with no explicit or implied warranties
|
|
in respect of its properties, including, but not limited to, correctness
|
|
and/or fitness for purpose.
|
|
---------------------------------------------------------------------------
|
|
Issue Date: 10/11/2002
|
|
|
|
This is a byte oriented version of SHA1 that operates on arrays of bytes
|
|
stored in memory. It runs at 22 cycles per byte on a Pentium P4 processor
|
|
*/
|
|
|
|
#define SHA1_BLOCK_SIZE 64
|
|
#define SHA1_DIGEST_SIZE 20
|
|
#define SHA1_HASH_SIZE SHA1_DIGEST_SIZE
|
|
#define SHA2_GOOD 0
|
|
#define SHA2_BAD 1
|
|
|
|
/* type to hold the SHA1 context */
|
|
typedef struct
|
|
{ uint32_t count[2];
|
|
uint32_t hash[5];
|
|
uint32_t wbuf[16];
|
|
} sha1_ctx;
|
|
|
|
#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
|
|
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
# define swap_b32(x) (x)
|
|
#elif defined(bswap_32)
|
|
# define swap_b32(x) bswap_32(x)
|
|
#else
|
|
# define swap_b32(x) ((rotl32((x), 8) & 0x00ff00ff) | (rotl32((x), 24) & 0xff00ff00))
|
|
#endif
|
|
|
|
#define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
|
|
|
|
/* reverse byte order in 32-bit words */
|
|
#define ch(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
|
|
#define parity(x,y,z) ((x) ^ (y) ^ (z))
|
|
#define maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
|
|
|
|
/* A normal version as set out in the FIPS. This version uses */
|
|
/* partial loop unrolling and is optimised for the Pentium 4 */
|
|
#define rnd(f,k) \
|
|
t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
|
|
e = d; d = c; c = rotl32(b, 30); b = t
|
|
|
|
void sha1_compile(sha1_ctx ctx[1])
|
|
{
|
|
uint32_t w[80], i, a, b, c, d, e, t;
|
|
|
|
/* note that words are compiled from the buffer into 32-bit */
|
|
/* words in big-endian order so an order reversal is needed */
|
|
/* here on little endian machines */
|
|
for(i = 0; i < SHA1_BLOCK_SIZE / 4; ++i)
|
|
w[i] = swap_b32(ctx->wbuf[i]);
|
|
|
|
for(i = SHA1_BLOCK_SIZE / 4; i < 80; ++i)
|
|
w[i] = rotl32(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
|
|
|
|
a = ctx->hash[0];
|
|
b = ctx->hash[1];
|
|
c = ctx->hash[2];
|
|
d = ctx->hash[3];
|
|
e = ctx->hash[4];
|
|
|
|
for(i = 0; i < 20; ++i)
|
|
{
|
|
rnd(ch, 0x5a827999);
|
|
}
|
|
|
|
for(i = 20; i < 40; ++i)
|
|
{
|
|
rnd(parity, 0x6ed9eba1);
|
|
}
|
|
|
|
for(i = 40; i < 60; ++i)
|
|
{
|
|
rnd(maj, 0x8f1bbcdc);
|
|
}
|
|
|
|
for(i = 60; i < 80; ++i)
|
|
{
|
|
rnd(parity, 0xca62c1d6);
|
|
}
|
|
|
|
ctx->hash[0] += a;
|
|
ctx->hash[1] += b;
|
|
ctx->hash[2] += c;
|
|
ctx->hash[3] += d;
|
|
ctx->hash[4] += e;
|
|
}
|
|
|
|
void sha1_begin(sha1_ctx ctx[1])
|
|
{
|
|
ctx->count[0] = ctx->count[1] = 0;
|
|
ctx->hash[0] = 0x67452301;
|
|
ctx->hash[1] = 0xefcdab89;
|
|
ctx->hash[2] = 0x98badcfe;
|
|
ctx->hash[3] = 0x10325476;
|
|
ctx->hash[4] = 0xc3d2e1f0;
|
|
}
|
|
|
|
/* SHA1 hash data in an array of bytes into hash buffer and call the */
|
|
/* hash_compile function as required. */
|
|
void sha1_hash(const unsigned char data[], unsigned int len, sha1_ctx ctx[1])
|
|
{
|
|
uint32_t pos = (uint32_t)(ctx->count[0] & SHA1_MASK),
|
|
freeb = SHA1_BLOCK_SIZE - pos;
|
|
const unsigned char *sp = data;
|
|
|
|
if((ctx->count[0] += len) < len)
|
|
++(ctx->count[1]);
|
|
|
|
while(len >= freeb) /* tranfer whole blocks while possible */
|
|
{
|
|
memcpy(((unsigned char*)ctx->wbuf) + pos, sp, freeb);
|
|
sp += freeb; len -= freeb; freeb = SHA1_BLOCK_SIZE; pos = 0;
|
|
sha1_compile(ctx);
|
|
}
|
|
|
|
memcpy(((unsigned char*)ctx->wbuf) + pos, sp, len);
|
|
}
|
|
|
|
/* SHA1 Final padding and digest calculation */
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
static uint32_t mask[4] =
|
|
{ 0x00000000, 0x000000ff, 0x0000ffff, 0x00ffffff };
|
|
static uint32_t bits[4] =
|
|
{ 0x00000080, 0x00008000, 0x00800000, 0x80000000 };
|
|
#else
|
|
static uint32_t mask[4] =
|
|
{ 0x00000000, 0xff000000, 0xffff0000, 0xffffff00 };
|
|
static uint32_t bits[4] =
|
|
{ 0x80000000, 0x00800000, 0x00008000, 0x00000080 };
|
|
#endif
|
|
|
|
void sha1_end(unsigned char hval[], sha1_ctx ctx[1])
|
|
{
|
|
uint32_t i, cnt = (uint32_t)(ctx->count[0] & SHA1_MASK);
|
|
|
|
/* mask out the rest of any partial 32-bit word and then set */
|
|
/* the next byte to 0x80. On big-endian machines any bytes in */
|
|
/* the buffer will be at the top end of 32 bit words, on little */
|
|
/* endian machines they will be at the bottom. Hence the AND */
|
|
/* and OR masks above are reversed for little endian systems */
|
|
ctx->wbuf[cnt >> 2] = (ctx->wbuf[cnt >> 2] & mask[cnt & 3]) | bits[cnt & 3];
|
|
|
|
/* we need 9 or more empty positions, one for the padding byte */
|
|
/* (above) and eight for the length count. If there is not */
|
|
/* enough space pad and empty the buffer */
|
|
if(cnt > SHA1_BLOCK_SIZE - 9)
|
|
{
|
|
if(cnt < 60) ctx->wbuf[15] = 0;
|
|
sha1_compile(ctx);
|
|
cnt = 0;
|
|
}
|
|
else /* compute a word index for the empty buffer positions */
|
|
cnt = (cnt >> 2) + 1;
|
|
|
|
while(cnt < 14) /* and zero pad all but last two positions */
|
|
ctx->wbuf[cnt++] = 0;
|
|
|
|
/* assemble the eight byte counter in the buffer in big-endian */
|
|
/* format */
|
|
|
|
ctx->wbuf[14] = swap_b32((ctx->count[1] << 3) | (ctx->count[0] >> 29));
|
|
ctx->wbuf[15] = swap_b32(ctx->count[0] << 3);
|
|
|
|
sha1_compile(ctx);
|
|
|
|
/* extract the hash value as bytes in case the hash buffer is */
|
|
/* misaligned for 32-bit words */
|
|
|
|
for(i = 0; i < SHA1_DIGEST_SIZE; ++i)
|
|
hval[i] = (unsigned char)(ctx->hash[i >> 2] >> 8 * (~i & 3));
|
|
}
|
|
|
|
#if 0
|
|
void sha1(unsigned char hval[], const unsigned char data[], unsigned int len)
|
|
{ sha1_ctx cx[1];
|
|
|
|
sha1_begin(cx); sha1_hash(data, len, cx); sha1_end(hval, cx);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
---------------------------------------------------------------------------
|
|
End of Dr. Gladman's sha1 code
|
|
---------------------------------------------------------------------------
|
|
*/
|
|
|
|
/* Using a larger blocksize can make things _much_ faster
|
|
* by avoiding a zillion tiny little reads */
|
|
#define BLOCKSIZE 65536
|
|
/* Ensure that BLOCKSIZE is a multiple of 64. */
|
|
#if BLOCKSIZE % SHA1_BLOCK_SIZE != 0
|
|
# error "BLOCKSIZE not a multiple of 64"
|
|
#endif
|
|
|
|
static int sha1sum_stream(FILE *stream, unsigned char *hashval)
|
|
{
|
|
int result = 0;
|
|
sha1_ctx cx[1];
|
|
size_t sum, n;
|
|
RESERVE_CONFIG_BUFFER(buffer, BLOCKSIZE + 72);
|
|
|
|
/* Initialize the computation context. */
|
|
sha1_begin(cx);
|
|
|
|
/* Iterate over full file contents. */
|
|
while (1)
|
|
{
|
|
/* We read the file in blocks of BLOCKSIZE bytes. One call of the
|
|
computation function processes the whole buffer so that with the
|
|
next round of the loop another block can be read. */
|
|
sum = 0;
|
|
|
|
/* Read block. Take care for partial reads. */
|
|
while (1)
|
|
{
|
|
n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
|
|
sum += n;
|
|
|
|
if (sum == BLOCKSIZE)
|
|
break;
|
|
|
|
if (n == 0) {
|
|
/* Check for the error flag IFF N == 0, so that we don't
|
|
exit the loop after a partial read due to e.g., EAGAIN
|
|
or EWOULDBLOCK. */
|
|
if (feof (stream)) {
|
|
sum = 0;
|
|
goto process_partial_block;
|
|
}
|
|
if (ferror (stream)) {
|
|
result++;
|
|
goto all_done;
|
|
}
|
|
goto process_partial_block;
|
|
}
|
|
|
|
/* We've read at least one byte, so ignore errors. But always
|
|
check for EOF, since feof may be true even though N > 0.
|
|
Otherwise, we could end up calling fread after EOF. */
|
|
if (feof (stream))
|
|
goto process_partial_block;
|
|
}
|
|
|
|
/* Process buffer */
|
|
sha1_hash(buffer, BLOCKSIZE, cx);
|
|
}
|
|
|
|
process_partial_block:
|
|
|
|
/* Process any remaining bytes. */
|
|
if (sum > 0)
|
|
sha1_hash(buffer, sum, cx);
|
|
|
|
/* Finalize and write the hash into our buffer. */
|
|
sha1_end(hashval, cx);
|
|
|
|
all_done:
|
|
|
|
RELEASE_CONFIG_BUFFER(buffer);
|
|
return result;
|
|
}
|
|
|
|
#define FLAG_SILENT 1
|
|
#define FLAG_CHECK 2
|
|
#define FLAG_WARN 4
|
|
|
|
static unsigned char *hash_bin_to_hex(unsigned char *hash_value, unsigned char hash_length)
|
|
{
|
|
int x, len, max;
|
|
unsigned char *hex_value;
|
|
|
|
max = (hash_length * 2) + 2;
|
|
hex_value = xmalloc(max);
|
|
for (x = len = 0; x < hash_length; x++) {
|
|
len += snprintf(hex_value+len, max-len, "%02x", hash_value[x]);
|
|
}
|
|
return(hex_value);
|
|
}
|
|
|
|
FILE *wfopen_file_or_stdin(const char *file_ptr)
|
|
{
|
|
FILE *stream;
|
|
|
|
if ((file_ptr[0] == '-') && (file_ptr[1] == '\0')) {
|
|
stream = stdin;
|
|
} else {
|
|
stream = bb_wfopen(file_ptr, "r");
|
|
}
|
|
|
|
return(stream);
|
|
}
|
|
|
|
/* This could become a common function for md5 as well, by using md5_stream */
|
|
extern int authenticate(int argc, char **argv,
|
|
int (*hash_ptr)(FILE *stream, unsigned char *hashval),
|
|
const unsigned char hash_length)
|
|
{
|
|
unsigned char hash_value[hash_length];
|
|
unsigned int flags;
|
|
int return_value = EXIT_SUCCESS;
|
|
|
|
#ifdef CONFIG_FEATURE_SHA1SUM_CHECK
|
|
flags = bb_getopt_ulflags(argc, argv, "scw");
|
|
#else
|
|
flags = bb_getopt_ulflags(argc, argv, "s");
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_SHA1SUM_CHECK
|
|
if (!(flags & FLAG_CHECK)) {
|
|
if (flags & FLAG_SILENT) {
|
|
bb_error_msg_and_die("the -s option is meaningful only when verifying checksums");
|
|
}
|
|
else if (flags & FLAG_WARN) {
|
|
bb_error_msg_and_die("the -w option is meaningful only when verifying checksums");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (argc == optind) {
|
|
argv[argc++] = "-";
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_SHA1SUM_CHECK
|
|
if (flags & FLAG_CHECK) {
|
|
FILE *pre_computed_stream;
|
|
int count_total = 0;
|
|
int count_failed = 0;
|
|
unsigned char *file_ptr = argv[optind];
|
|
|
|
if (optind + 1 != argc) {
|
|
bb_error_msg_and_die("only one argument may be specified when using -c");
|
|
}
|
|
pre_computed_stream = wfopen_file_or_stdin(file_ptr);
|
|
while (!feof(pre_computed_stream) && !ferror(pre_computed_stream)) {
|
|
FILE *stream;
|
|
char *line;
|
|
char *line_ptr;
|
|
char *hex_value;
|
|
|
|
line = bb_get_chomped_line_from_file(pre_computed_stream);
|
|
if (line == NULL) {
|
|
break;
|
|
}
|
|
count_total++;
|
|
line_ptr = strchr(line, ' ');
|
|
if (line_ptr == NULL) {
|
|
if (flags & FLAG_WARN) {
|
|
bb_error_msg("Invalid format");
|
|
}
|
|
free(line);
|
|
continue;
|
|
}
|
|
*line_ptr = '\0';
|
|
line_ptr++;
|
|
if ((flags & FLAG_WARN) && (*line_ptr != ' ')) {
|
|
bb_error_msg("Invalid format");
|
|
free(line);
|
|
continue;
|
|
}
|
|
line_ptr++;
|
|
stream = bb_wfopen(line_ptr, "r");
|
|
if (hash_ptr(stream, hash_value) == EXIT_FAILURE) {
|
|
bb_perror_msg("%s", file_ptr);
|
|
return_value = EXIT_FAILURE;
|
|
}
|
|
if (fclose(stream) == EOF) {
|
|
bb_perror_msg("Couldnt close file %s", file_ptr);
|
|
}
|
|
hex_value = hash_bin_to_hex(hash_value, hash_length);
|
|
printf("%s: ", line_ptr);
|
|
if (strcmp(hex_value, line) != 0) {
|
|
puts("FAILED");
|
|
count_failed++;
|
|
} else {
|
|
puts("ok");
|
|
}
|
|
free(line);
|
|
}
|
|
if (count_failed) {
|
|
bb_error_msg("WARNING: %d of %d computed checksum did NOT match", count_failed, count_total);
|
|
}
|
|
if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
|
|
bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
|
|
}
|
|
} else
|
|
#endif
|
|
while (optind < argc) {
|
|
FILE *stream;
|
|
unsigned char *file_ptr = argv[optind];
|
|
|
|
optind++;
|
|
|
|
stream = wfopen_file_or_stdin(file_ptr);
|
|
if (stream == NULL) {
|
|
return_value = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
if (hash_ptr(stream, hash_value) == EXIT_FAILURE) {
|
|
bb_perror_msg("%s", file_ptr);
|
|
return_value = EXIT_FAILURE;
|
|
}
|
|
else if (!flags & FLAG_SILENT) {
|
|
char *hex_value = hash_bin_to_hex(hash_value, hash_length);
|
|
printf("%s %s\n", hex_value, file_ptr);
|
|
free(hex_value);
|
|
}
|
|
|
|
if (bb_fclose_nonstdin(stream) == EOF) {
|
|
bb_perror_msg("Couldnt close file %s", file_ptr);
|
|
return_value = EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
return(return_value);
|
|
}
|
|
|
|
extern int sha1sum_main(int argc, char **argv)
|
|
{
|
|
return (authenticate(argc, argv, sha1sum_stream, SHA1_HASH_SIZE));
|
|
}
|