sbase

suckless unix tools
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commit 50054a652ca1ef9659304fadef2772f90a16aef5
parent 3c5f2b240750b3226c8dee75c1b20785f9bb2f16
Author: stateless <stateless@archlinux.us>
Date:   Wed Jun 19 09:54:52 +0100

Add md5sum

No support for -c at the moment.

Diffstat:
Makefile | 2++
md5.h | 18++++++++++++++++++
md5sum.1 | 8++++++++
md5sum.c | 67+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
util/md5.c | 139+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 234 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile @@ -15,6 +15,7 @@ LIB = \ util/estrtol.o \ util/fnck.o \ util/getlines.o \ + util/md5.o \ util/putword.o \ util/recurse.o \ util/rm.o @@ -45,6 +46,7 @@ SRC = \ ln.c \ ls.c \ mc.c \ + md5sum.c \ mkdir.c \ mkfifo.c \ mknod.c \ diff --git a/md5.h b/md5.h @@ -0,0 +1,18 @@ +/* public domain md5 implementation based on rfc1321 and libtomcrypt */ + +struct md5 { + uint64_t len; /* processed message length */ + uint32_t h[4]; /* hash state */ + uint8_t buf[64]; /* message block buffer */ +}; + +enum { MD5_DIGEST_LENGTH = 16 }; + +/* reset state */ +void md5_init(struct md5 *s); +/* process message */ +void md5_update(struct md5 *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 md5_sum(struct md5 *s, uint8_t md[MD5_DIGEST_LENGTH]); diff --git a/md5sum.1 b/md5sum.1 @@ -0,0 +1,8 @@ +.TH MD5SUM 1 sbase\-VERSION +.SH NAME +md5sum \- compute MD5 message digest +.SH SYNOPSIS +.B md5sum +.RI [ file ...] +.SH DESCRIPTION +Print MD5 (128-bit) checksums. With no file, read standard input. diff --git a/md5sum.c b/md5sum.c @@ -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 "md5.h" + +static void md5sum(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) { + md5sum(STDIN_FILENO, "<stdin>"); + } else { + for (; argc > 0; argc--) { + if ((fd = open(*argv, O_RDONLY)) < 0) + eprintf("open %s:", *argv); + md5sum(fd, *argv); + close(fd); + argv++; + } + } + + return 0; +} + +static void +md5sum(int fd, const char *f) +{ + unsigned char buf[BUFSIZ]; + unsigned char digest[MD5_DIGEST_LENGTH]; + struct md5 s; + ssize_t n; + int i; + + md5_init(&s); + while ((n = read(fd, buf, sizeof buf)) > 0) + md5_update(&s, buf, n); + if (n < 0) { + eprintf("%s: read error:", f); + return; + } + + md5_sum(&s, digest); + + for (i = 0; i < sizeof(digest); i++) + printf("%02x", digest[i]); + printf(" %s\n", f); +} diff --git a/util/md5.c b/util/md5.c @@ -0,0 +1,139 @@ +/* public domain md5 implementation based on rfc1321 and libtomcrypt */ +#include <stdint.h> +#include <string.h> +#include "../md5.h" + +static uint32_t rol(uint32_t n, int k) { return (n << k) | (n >> (32-k)); } +#define F(x,y,z) (z ^ (x & (y ^ z))) +#define G(x,y,z) (y ^ (z & (y ^ x))) +#define H(x,y,z) (x ^ y ^ z) +#define I(x,y,z) (y ^ (x | ~z)) +#define FF(a,b,c,d,w,s,t) a += F(b,c,d) + w + t; a = rol(a,s) + b +#define GG(a,b,c,d,w,s,t) a += G(b,c,d) + w + t; a = rol(a,s) + b +#define HH(a,b,c,d,w,s,t) a += H(b,c,d) + w + t; a = rol(a,s) + b +#define II(a,b,c,d,w,s,t) a += I(b,c,d) + w + t; a = rol(a,s) + b + +static const uint32_t tab[64] = { + 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, + 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, + 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, + 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, + 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, + 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, + 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, + 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 +}; + +static void processblock(struct md5 *s, const uint8_t *buf) +{ + uint32_t i, W[16], a, b, c, d; + + for (i = 0; i < 16; i++) { + W[i] = buf[4*i]; + W[i] |= (uint32_t)buf[4*i+1]<<8; + W[i] |= (uint32_t)buf[4*i+2]<<16; + W[i] |= (uint32_t)buf[4*i+3]<<24; + } + + a = s->h[0]; + b = s->h[1]; + c = s->h[2]; + d = s->h[3]; + + i = 0; + while (i < 16) { + FF(a,b,c,d, W[i], 7, tab[i]); i++; + FF(d,a,b,c, W[i], 12, tab[i]); i++; + FF(c,d,a,b, W[i], 17, tab[i]); i++; + FF(b,c,d,a, W[i], 22, tab[i]); i++; + } + while (i < 32) { + GG(a,b,c,d, W[(5*i+1)%16], 5, tab[i]); i++; + GG(d,a,b,c, W[(5*i+1)%16], 9, tab[i]); i++; + GG(c,d,a,b, W[(5*i+1)%16], 14, tab[i]); i++; + GG(b,c,d,a, W[(5*i+1)%16], 20, tab[i]); i++; + } + while (i < 48) { + HH(a,b,c,d, W[(3*i+5)%16], 4, tab[i]); i++; + HH(d,a,b,c, W[(3*i+5)%16], 11, tab[i]); i++; + HH(c,d,a,b, W[(3*i+5)%16], 16, tab[i]); i++; + HH(b,c,d,a, W[(3*i+5)%16], 23, tab[i]); i++; + } + while (i < 64) { + II(a,b,c,d, W[7*i%16], 6, tab[i]); i++; + II(d,a,b,c, W[7*i%16], 10, tab[i]); i++; + II(c,d,a,b, W[7*i%16], 15, tab[i]); i++; + II(b,c,d,a, W[7*i%16], 21, tab[i]); i++; + } + + s->h[0] += a; + s->h[1] += b; + s->h[2] += c; + s->h[3] += d; +} + +static void pad(struct md5 *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; + s->buf[57] = s->len >> 8; + s->buf[58] = s->len >> 16; + s->buf[59] = s->len >> 24; + s->buf[60] = s->len >> 32; + s->buf[61] = s->len >> 40; + s->buf[62] = s->len >> 48; + s->buf[63] = s->len >> 56; + processblock(s, s->buf); +} + +void md5_init(struct md5 *s) +{ + s->len = 0; + s->h[0] = 0x67452301; + s->h[1] = 0xefcdab89; + s->h[2] = 0x98badcfe; + s->h[3] = 0x10325476; +} + +void md5_sum(struct md5 *s, uint8_t md[16]) +{ + int i; + + pad(s); + for (i = 0; i < 4; i++) { + md[4*i] = s->h[i]; + md[4*i+1] = s->h[i] >> 8; + md[4*i+2] = s->h[i] >> 16; + md[4*i+3] = s->h[i] >> 24; + } +} + +void md5_update(struct md5 *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); +}