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//
// turboshake128-example: Absorb 4096 bytes of data from /dev/urandom in
// 1024 byte chunks, hash it with TurboShake128, then print 128 bytes of
// result in 32 byte chunks (hex-encoded) to standard output.
// output.
//
#include <stdint.h>
#include <stdio.h>
#include <err.h>
#include "hex.h"
#include "sha3.h"
int main() {
// init turboshake
turboshake_t ts;
turboshake128_init(&ts);
// open source
FILE *fh = fopen("/dev/urandom", "rb");
if (!fh) {
err(-1, "fopen()");
}
{
// read and absorb
uint8_t buf[1024] = { 0 };
for (size_t i = 0; i < 4096/sizeof(buf); i++) {
// read data
if (!fread(buf, sizeof(buf), 1, fh)) {
err(-1, "fread()");
}
// absorb
turboshake128_absorb(&ts, buf, sizeof(buf));
}
}
// close source
if (!fclose(fh)) {
warn("fclose()");
}
printf("TurboShake128 output:\n");
{
// squeeze in 32 byte chunks, write to stdout
uint8_t buf[32] = { 0 };
for (size_t ofs = 0; ofs < 128; ofs += sizeof(buf)) {
turboshake128_squeeze(&ts, buf, sizeof(buf));
hex_write(stdout, buf, sizeof(buf));
}
}
printf("\n");
return 0;
}
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