#include <s.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "impl.h"

#include "lib.h"



static int
usage(FILE *restrict stream, const char *const argv0) {
	return fprintf(stream, "Usage: %s KEY DATA\n", argv0) < 0;
}

void
siphash(
	const u8                   key[SIPHASH_KEY_LENGTH],
	const size_t               inlen,
	const void *const restrict in,
	u8                         out[SIPHASH_OUTPUT_LENGTH]
) {
	siphash_impl(in, inlen, key, out, SIPHASH_OUTPUT_LENGTH);
}

int
siphash_main(int argc, char *argv[]) {
	int rc = EXIT_USAGE;

	if (argc != 3) {
		if (usage(stderr, argv[0])) {
			rc = EXIT_FAILURE;
			perror("usage()");
			goto out;
		}
		goto out;
	}

	const char *const key  = argv[1];
	const char *const data = argv[2];
	const size_t keylen  = strlen(key);
	const size_t datalen = strlen(data);
	if (keylen < SIPHASH_KEY_LENGTH) {
		if (fprintf(
			stderr,
			"KEY (%lu) is smaller than SIPHASH_KEY_LENGTH (%d).\n",
			keylen,
			SIPHASH_KEY_LENGTH
		) < 0) {
			rc = EXIT_FAILURE;
			perror("fprintf()");
			goto out;
		}
		goto out;
	}

	u8 out[SIPHASH_OUTPUT_LENGTH];
	siphash((u8 *)key, datalen, data, out);
	for (int i = 0; i < SIPHASH_OUTPUT_LENGTH; i++) {
		const u8 c = out[i];
		if (printf("%x", c) < 0) {
			rc = EXIT_FAILURE;
			perror("printf()");
			goto out;
		}
	}
	if (printf("\n") < 0) {
		rc = EXIT_FAILURE;
		perror("printf()");
		goto out;
	}

	rc = EXIT_SUCCESS;
out:
	return rc;
}