sbase

suckless unix tools
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commit 4da54928e73d89fc6a344740bf35d5470b2e7463
parent f636ac791bd87faa9556e0c6ed858777dd8295c6
Author: sin <sin@2f30.org>
Date:   Fri, 19 Jul 2013 14:29:43 +0100

Add sha256sum(1)

Diffstat:
Makefile | 4+++-
sha256.h | 18++++++++++++++++++
sha256sum.1 | 8++++++++
sha256sum.c | 49+++++++++++++++++++++++++++++++++++++++++++++++++
util/sha256.c | 152+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 230 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile @@ -20,7 +20,8 @@ LIB = \ util/putword.o \ util/recurse.o \ util/rm.o \ - util/sha1.o + util/sha1.o \ + util/sha256.o SRC = \ basename.c \ @@ -80,6 +81,7 @@ SRC = \ unlink.c \ seq.c \ sha1sum.c \ + sha256sum.c\ wc.c \ who.c \ yes.c diff --git a/sha256.h b/sha256.h @@ -0,0 +1,18 @@ +/* public domain sha256 implementation based on fips180-3 */ + +struct sha256 { + uint64_t len; /* processed message length */ + uint32_t h[8]; /* hash state */ + uint8_t buf[64]; /* message block buffer */ +}; + +enum { SHA256_DIGEST_LENGTH = 32 }; + +/* reset state */ +void sha256_init(void *ctx); +/* process message */ +void sha256_update(void *ctx, 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 sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]); diff --git a/sha256sum.1 b/sha256sum.1 @@ -0,0 +1,8 @@ +.TH SHA256SUM 1 sbase\-VERSION +.SH NAME +sha256sum \- compute SHA256 message digest +.SH SYNOPSIS +.B sha256sum +.RI [ file ...] +.SH DESCRIPTION +Print SHA256 (256-bit) checksums. With no file, read standard input. diff --git a/sha256sum.c b/sha256sum.c @@ -0,0 +1,49 @@ +/* See LICENSE file for copyright and license details. */ +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include "util.h" +#include "crypt.h" +#include "sha256.h" + +struct sha256 s; +struct crypt_ops sha256_ops = { + sha256_init, + sha256_update, + sha256_sum, + &s, +}; + +static void +usage(void) +{ + eprintf("usage: %s [file...]\n", argv0); +} + +int +main(int argc, char *argv[]) +{ + FILE *fp; + uint8_t md[SHA256_DIGEST_LENGTH]; + + ARGBEGIN { + default: + usage(); + } ARGEND; + + if (argc == 0) { + cryptsum(&sha256_ops, stdin, "<stdin>", md); + mdprint(md, "<stdin>", sizeof(md)); + } else { + for (; argc > 0; argc--) { + if ((fp = fopen(*argv, "r")) == NULL) + eprintf("fopen %s:", *argv); + cryptsum(&sha256_ops, fp, *argv, md); + mdprint(md, *argv, sizeof(md)); + fclose(fp); + argv++; + } + } + + return 0; +} diff --git a/util/sha256.c b/util/sha256.c @@ -0,0 +1,152 @@ +/* + * public domain sha256 crypt implementation + * + * original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt + * in this implementation at least 32bit int is assumed, + * key length is limited, the $5$ prefix is mandatory, '\n' and ':' is rejected + * in the salt and rounds= setting must contain a valid iteration count, + * on error "*" is returned. + */ +#include <ctype.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <stdint.h> +#include "../sha256.h" + +/* public domain sha256 implementation based on fips180-3 */ + +static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); } +#define Ch(x,y,z) (z ^ (x & (y ^ z))) +#define Maj(x,y,z) ((x & y) | (z & (x | y))) +#define S0(x) (ror(x,2) ^ ror(x,13) ^ ror(x,22)) +#define S1(x) (ror(x,6) ^ ror(x,11) ^ ror(x,25)) +#define R0(x) (ror(x,7) ^ ror(x,18) ^ (x>>3)) +#define R1(x) (ror(x,17) ^ ror(x,19) ^ (x>>10)) + +static const uint32_t K[64] = { +0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, +0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, +0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, +0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, +0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, +0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, +0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, +0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 +}; + +static void processblock(struct sha256 *s, const uint8_t *buf) +{ + uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h; + 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 < 64; i++) + W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16]; + a = s->h[0]; + b = s->h[1]; + c = s->h[2]; + d = s->h[3]; + e = s->h[4]; + f = s->h[5]; + g = s->h[6]; + h = s->h[7]; + for (i = 0; i < 64; i++) { + t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i]; + t2 = S0(a) + Maj(a,b,c); + h = g; + g = f; + f = e; + e = d + t1; + d = c; + c = b; + b = a; + a = t1 + t2; + } + s->h[0] += a; + s->h[1] += b; + s->h[2] += c; + s->h[3] += d; + s->h[4] += e; + s->h[5] += f; + s->h[6] += g; + s->h[7] += h; +} + +static void pad(struct sha256 *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 sha256_init(void *ctx) +{ + struct sha256 *s = ctx; + s->len = 0; + s->h[0] = 0x6a09e667; + s->h[1] = 0xbb67ae85; + s->h[2] = 0x3c6ef372; + s->h[3] = 0xa54ff53a; + s->h[4] = 0x510e527f; + s->h[5] = 0x9b05688c; + s->h[6] = 0x1f83d9ab; + s->h[7] = 0x5be0cd19; +} + +void sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]) +{ + struct sha256 *s = ctx; + int i; + + pad(s); + for (i = 0; i < 8; 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 sha256_update(void *ctx, const void *m, unsigned long len) +{ + struct sha256 *s = ctx; + 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); +}