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// main.c: sha3 test application
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "sha3.h"
// print hex-encoded buffer to stdout.
static void print_hex(const uint8_t * const buf, const size_t len) {
for (size_t i = 0; i < len; i++) {
printf("%02x", buf[i]);
}
}
// shake128-xof handler
static void do_shake128_xof(const uint8_t *msg, const size_t msg_len, const size_t out_len) {
// init xof
sha3_xof_t xof;
shake128_xof_init(&xof);
// absorb
if (!shake128_xof_absorb(&xof, msg, msg_len)) {
fprintf(stderr, "Error: shake128_xof_absorb() failed\n");
exit(-1);
}
uint8_t buf[64];
for (size_t i = 0; i < out_len; i += sizeof(buf)) {
// squeeze and print
const size_t len = (out_len - i < sizeof(buf)) ? out_len - i : sizeof(buf);
shake128_xof_squeeze(&xof, buf, len);
print_hex(buf, len);
}
fputs("\n", stdout);
}
// shake256-xof handler
static void do_shake256_xof(const uint8_t * const msg, const size_t msg_len, const size_t out_len) {
// init xof
sha3_xof_t xof;
shake256_xof_init(&xof);
// absorb
if (!shake256_xof_absorb(&xof, msg, msg_len)) {
fprintf(stderr, "Error: shake256_xof_absorb() failed\n");
exit(-1);
}
uint8_t buf[64];
for (size_t i = 0; i < out_len; i += sizeof(buf)) {
// squeeze and print
const size_t len = (out_len - i < sizeof(buf)) ? out_len - i : sizeof(buf);
shake256_xof_squeeze(&xof, buf, len);
print_hex(buf, len);
}
fputs("\n", stdout);
}
// available hash functions
static const struct {
const char *name;
const size_t size;
void (*hash_func)(const uint8_t *, size_t, uint8_t *);
void (*xof_func)(const uint8_t *, size_t, size_t);
} fns[] = {{
.name = "sha3-224",
.size = 28,
.hash_func = sha3_224,
}, {
.name = "sha3-256",
.size = 32,
.hash_func = sha3_256,
}, {
.name = "sha3-384",
.size = 48,
.hash_func = sha3_384,
}, {
.name = "sha3-512",
.size = 64,
.hash_func = sha3_512,
}, {
.name = "shake128",
.size = 16,
.hash_func = shake128,
}, {
.name = "shake256",
.size = 32,
.hash_func = shake256,
}, {
.name = "shake128-xof",
.size = 16, // default size
.xof_func = do_shake128_xof,
}, {
.name = "shake256-xof",
.size = 32, // default size
.xof_func = do_shake256_xof,
}};
// number of hash functions
#define NUM_FNS (sizeof(fns) / sizeof(fns[0]))
// get hash function offset in fns. returns NUM_FNS if the function is
// unknown.
static size_t get_fn_ofs(const char * const name) {
for (size_t i = 0; i < NUM_FNS; i++) {
if (!strncmp(name, fns[i].name, strlen(fns[i].name) + 1)) {
return i;
}
}
// not found
return NUM_FNS;
}
// usage format string
#define USAGE "Usage: %s <algo> <data> [xof-size]\n" \
"\n" \
"Algorithms:\n" \
"- sha3-224\n" \
"- sha3-256\n" \
"- sha3-384\n" \
"- sha3-512\n" \
"- shake128\n" \
"- shake256\n" \
"- shake128-xof (XOF)\n" \
"- shake256-xof (XOF)\n" \
"\n" \
"Examples:\n" \
" # get SHA3-256 hash of string \"asdf\"\n" \
" %s sha3-256 \"asdf\"\n" \
" dd2781f4c51bccdbe23e4d398b8a82261f585c278dbb4b84989fea70e76723a9\n" \
"\n" \
" # get first 40 bytes of SHAKE128-XOF output of string \"foo\"\n" \
" %s shake128-xof foo 40\n" \
" f84e95cb5fbd2038863ab27d3cdeac295ad2d4ab96ad1f4b070c0bf36078ef0881db3194a9d0f3dd\n"
int main(int argc, char *argv[]) {
// check command-line arguments
if (argc < 3) {
const char *app = (argc > 0) ? argv[0] : "sha3";
fprintf(stderr, USAGE, app, app, app);
return -1;
}
// get message and message length
const uint8_t * const msg = (uint8_t*) argv[2];
const size_t len = strlen(argv[2]);
// get function offset
const size_t ofs = get_fn_ofs(argv[1]);
if (ofs == NUM_FNS) {
fprintf(stderr, "Unknown algorithm: %s\n", argv[1]);
return -1;
}
if (fns[ofs].xof_func) {
// get output size from argument, or use default output size
const size_t out_size = (argc == 4) ? (size_t) atoi(argv[3]) : fns[ofs].size;
fns[ofs].xof_func(msg, len, out_size);
} else {
// hash into buffer, print buffer, print newline
uint8_t buf[64];
fns[ofs].hash_func(msg, len, buf);
print_hex(buf, fns[ofs].size);
fputs("\n", stdout);
}
// exit with success
return 0;
}
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