Add sha1sum

No support for -c at the moment.
This commit is contained in:
stateless 2013-07-04 12:14:14 +01:00 committed by David Galos
parent 50054a652c
commit eec1b415d5
5 changed files with 230 additions and 1 deletions

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@ -18,7 +18,8 @@ LIB = \
util/md5.o \ util/md5.o \
util/putword.o \ util/putword.o \
util/recurse.o \ util/recurse.o \
util/rm.o util/rm.o \
util/sha1.o
SRC = \ SRC = \
basename.c \ basename.c \
@ -76,6 +77,7 @@ SRC = \
uniq.c \ uniq.c \
unlink.c \ unlink.c \
seq.c \ seq.c \
sha1sum.c \
wc.c \ wc.c \
who.c \ who.c \
yes.c yes.c

18
sha1.h Normal file
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@ -0,0 +1,18 @@
/* public domain sha1 implementation based on rfc3174 and libtomcrypt */
struct sha1 {
uint64_t len; /* processed message length */
uint32_t h[5]; /* hash state */
uint8_t buf[64]; /* message block buffer */
};
enum { SHA1_DIGEST_LENGTH = 20 };
/* reset state */
void sha1_init(struct sha1 *s);
/* process message */
void sha1_update(struct sha1 *s, const void *m, unsigned long len);
/* get message digest */
/* state is ruined after sum, keep a copy if multiple sum is needed */
/* part of the message might be left in s, zero it if secrecy is needed */
void sha1_sum(struct sha1 *s, uint8_t md[SHA1_DIGEST_LENGTH]);

8
sha1sum.1 Normal file
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@ -0,0 +1,8 @@
.TH SHA1SUM 1 sbase\-VERSION
.SH NAME
sha1sum \- compute SHA-1 message digest
.SH SYNOPSIS
.B sha1sum
.RI [ file ...]
.SH DESCRIPTION
Print SHA-1 (160-bit) checksums. With no file, read standard input.

67
sha1sum.c Normal file
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@ -0,0 +1,67 @@
/* See LICENSE file for copyright and license details. */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "util.h"
#include "sha1.h"
static void sha1sum(int fd, const char *f);
static void
usage(void)
{
eprintf("usage: %s [file...]\n", argv0);
}
int
main(int argc, char *argv[])
{
int fd;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc == 0) {
sha1sum(STDIN_FILENO, "<stdin>");
} else {
for (; argc > 0; argc--) {
if ((fd = open(*argv, O_RDONLY)) < 0)
eprintf("open %s:", *argv);
sha1sum(fd, *argv);
close(fd);
argv++;
}
}
return 0;
}
static void
sha1sum(int fd, const char *f)
{
unsigned char buf[BUFSIZ];
unsigned char digest[SHA1_DIGEST_LENGTH];
struct sha1 s;
ssize_t n;
int i;
sha1_init(&s);
while ((n = read(fd, buf, sizeof buf)) > 0)
sha1_update(&s, buf, n);
if (n < 0) {
eprintf("%s: read error:", f);
return;
}
sha1_sum(&s, digest);
for (i = 0; i < sizeof(digest); i++)
printf("%02x", digest[i]);
printf(" %s\n", f);
}

134
util/sha1.c Normal file
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@ -0,0 +1,134 @@
/* public domain sha1 implementation based on rfc3174 and libtomcrypt */
#include <stdint.h>
#include <string.h>
#include "../sha1.h"
static uint32_t rol(uint32_t n, int k) { return (n << k) | (n >> (32-k)); }
#define F0(b,c,d) (d ^ (b & (c ^ d)))
#define F1(b,c,d) (b ^ c ^ d)
#define F2(b,c,d) ((b & c) | (d & (b | c)))
#define F3(b,c,d) (b ^ c ^ d)
#define G0(a,b,c,d,e,i) e += rol(a,5)+F0(b,c,d)+W[i]+0x5A827999; b = rol(b,30)
#define G1(a,b,c,d,e,i) e += rol(a,5)+F1(b,c,d)+W[i]+0x6ED9EBA1; b = rol(b,30)
#define G2(a,b,c,d,e,i) e += rol(a,5)+F2(b,c,d)+W[i]+0x8F1BBCDC; b = rol(b,30)
#define G3(a,b,c,d,e,i) e += rol(a,5)+F3(b,c,d)+W[i]+0xCA62C1D6; b = rol(b,30)
static void processblock(struct sha1 *s, const uint8_t *buf)
{
uint32_t W[80], a, b, c, d, e;
int i;
for (i = 0; i < 16; i++) {
W[i] = (uint32_t)buf[4*i]<<24;
W[i] |= (uint32_t)buf[4*i+1]<<16;
W[i] |= (uint32_t)buf[4*i+2]<<8;
W[i] |= buf[4*i+3];
}
for (; i < 80; i++)
W[i] = rol(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
a = s->h[0];
b = s->h[1];
c = s->h[2];
d = s->h[3];
e = s->h[4];
for (i = 0; i < 20; ) {
G0(a,b,c,d,e,i++);
G0(e,a,b,c,d,i++);
G0(d,e,a,b,c,i++);
G0(c,d,e,a,b,i++);
G0(b,c,d,e,a,i++);
}
for (; i < 40; ) {
G1(a,b,c,d,e,i++);
G1(e,a,b,c,d,i++);
G1(d,e,a,b,c,i++);
G1(c,d,e,a,b,i++);
G1(b,c,d,e,a,i++);
}
for (; i < 60; ) {
G2(a,b,c,d,e,i++);
G2(e,a,b,c,d,i++);
G2(d,e,a,b,c,i++);
G2(c,d,e,a,b,i++);
G2(b,c,d,e,a,i++);
}
for (; i < 80; ) {
G3(a,b,c,d,e,i++);
G3(e,a,b,c,d,i++);
G3(d,e,a,b,c,i++);
G3(c,d,e,a,b,i++);
G3(b,c,d,e,a,i++);
}
s->h[0] += a;
s->h[1] += b;
s->h[2] += c;
s->h[3] += d;
s->h[4] += e;
}
static void pad(struct sha1 *s)
{
unsigned r = s->len % 64;
s->buf[r++] = 0x80;
if (r > 56) {
memset(s->buf + r, 0, 64 - r);
r = 0;
processblock(s, s->buf);
}
memset(s->buf + r, 0, 56 - r);
s->len *= 8;
s->buf[56] = s->len >> 56;
s->buf[57] = s->len >> 48;
s->buf[58] = s->len >> 40;
s->buf[59] = s->len >> 32;
s->buf[60] = s->len >> 24;
s->buf[61] = s->len >> 16;
s->buf[62] = s->len >> 8;
s->buf[63] = s->len;
processblock(s, s->buf);
}
void sha1_init(struct sha1 *s)
{
s->len = 0;
s->h[0] = 0x67452301;
s->h[1] = 0xEFCDAB89;
s->h[2] = 0x98BADCFE;
s->h[3] = 0x10325476;
s->h[4] = 0xC3D2E1F0;
}
void sha1_sum(struct sha1 *s, uint8_t md[20])
{
int i;
pad(s);
for (i = 0; i < 5; i++) {
md[4*i] = s->h[i] >> 24;
md[4*i+1] = s->h[i] >> 16;
md[4*i+2] = s->h[i] >> 8;
md[4*i+3] = s->h[i];
}
}
void sha1_update(struct sha1 *s, const void *m, unsigned long len)
{
const uint8_t *p = m;
unsigned r = s->len % 64;
s->len += len;
if (r) {
if (len < 64 - r) {
memcpy(s->buf + r, p, len);
return;
}
memcpy(s->buf + r, p, 64 - r);
len -= 64 - r;
p += 64 - r;
processblock(s, s->buf);
}
for (; len >= 64; len -= 64, p += 64)
processblock(s, p);
memcpy(s->buf, p, len);
}