tests-hashes-sha256-chain.c
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/*
* Copyright (C) 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup unittests
* @{
*
* @file
* @brief testcases for the sha256-chain implementation
*
* @author Martin Landsmann <martin.landsmann@haw-hamburg.de>
*
* @}
*/
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "embUnit/embUnit.h"
#include "hashes/sha256.h"
#include "tests-hashes.h"
static void test_sha256_hash_chain(void)
{
const char strSeed[] = "My cool secret seed, you'll never guess it ;) 12345";
static unsigned char tail_hash_chain_element[SHA256_DIGEST_LENGTH];
/* we produce a sha256-chain of 257 elements */
size_t elements = 257;
memset(tail_hash_chain_element, 0, SHA256_DIGEST_LENGTH);
TEST_ASSERT(sha256_chain((unsigned char*)strSeed, strlen(strSeed),
elements, tail_hash_chain_element) != NULL);
/* we check if the first element is part of the chain */
unsigned char element_one[SHA256_DIGEST_LENGTH];
sha256((unsigned char*)strSeed, strlen(strSeed), element_one);
TEST_ASSERT(sha256_chain_verify_element(element_one, 0,
tail_hash_chain_element, elements) == 0);
/* now we check if the test fails if the index is wrong */
TEST_ASSERT(sha256_chain_verify_element(element_one, 2,
tail_hash_chain_element, elements) == 1);
/* now we check if other elements are also part of the chain */
unsigned char tmp_element[SHA256_DIGEST_LENGTH];
memcpy((void*)tmp_element, (void*)element_one, SHA256_DIGEST_LENGTH);
/* since we know the seed we build every element and test if its in the chain */
for (size_t i = 1; i < elements; ++i) {
sha256_context_t ctx;
sha256_init(&ctx);
sha256_update(&ctx, tmp_element, SHA256_DIGEST_LENGTH);
sha256_final(&ctx, tmp_element);
TEST_ASSERT(sha256_chain_verify_element(tmp_element, i,
tail_hash_chain_element, elements) == 0);
}
}
static void test_sha256_hash_chain_with_waypoints(void)
{
const char strSeed[] = "My cool secret seed, you'll never guess it ;P 123456!";
static unsigned char tail_hash_chain_element[SHA256_DIGEST_LENGTH];
/* we produce a sha256-chain of 257 elements */
size_t elements = 257;
/* the first element of the hash chain */
unsigned char element_one[SHA256_DIGEST_LENGTH];
sha256((unsigned char*)strSeed, strlen(strSeed), element_one);
/* now we check storing some waypoints, lets say 10 */
size_t waypoints_length = 10;
sha256_chain_idx_elm_t waypoints[waypoints_length];
memset(tail_hash_chain_element, 0, SHA256_DIGEST_LENGTH);
sha256_chain_with_waypoints((unsigned char*)strSeed,
strlen(strSeed),
elements,
tail_hash_chain_element,
waypoints,
&waypoints_length);
/* we test if the chain has been computed properly */
TEST_ASSERT(sha256_chain_verify_element(element_one, 0,
tail_hash_chain_element, elements) == 0);
/* and we check if our waypoints are properly stored */
for (size_t i = 0; i < (waypoints_length + 1); ++i) {
TEST_ASSERT(sha256_chain_verify_element(waypoints[i].element,
waypoints[i].index,
tail_hash_chain_element, elements) == 0);
}
}
static void test_sha256_hash_chain_store_whole(void)
{
const char strSeed[] = "My cool secret seed, you'll never guess it ;P 123456!";
static unsigned char tail_hash_chain_element[SHA256_DIGEST_LENGTH];
/* now we check storing the whole chain
* not a too large one though to remain inside the stack bounds
*/
size_t elements = 17;
/* the first element of the hash chain */
unsigned char element_one[SHA256_DIGEST_LENGTH];
sha256((unsigned char*)strSeed, strlen(strSeed), element_one);
size_t whole_chain_length = elements;
sha256_chain_idx_elm_t waypoints_whole_chain[whole_chain_length];
memset(tail_hash_chain_element, 0, SHA256_DIGEST_LENGTH);
sha256_chain_with_waypoints((unsigned char*)strSeed,
strlen(strSeed),
whole_chain_length,
tail_hash_chain_element,
waypoints_whole_chain,
&whole_chain_length);
/* we test again if the chain has been computed properly */
TEST_ASSERT(sha256_chain_verify_element(element_one, 0,
tail_hash_chain_element, elements) == 0);
/* and we check if our complete chain has been properly stored */
TEST_ASSERT( (whole_chain_length + 1) == elements );
for (size_t i = 0; i < (whole_chain_length + 1); ++i) {
TEST_ASSERT(sha256_chain_verify_element(waypoints_whole_chain[i].element,
waypoints_whole_chain[i].index,
tail_hash_chain_element, elements) == 0);
}
}
Test *tests_hashes_sha256_chain_tests(void)
{
EMB_UNIT_TESTFIXTURES(fixtures) {
new_TestFixture(test_sha256_hash_chain),
new_TestFixture(test_sha256_hash_chain_with_waypoints),
new_TestFixture(test_sha256_hash_chain_store_whole),
};
EMB_UNIT_TESTCALLER(hashes_sha256_tests, NULL, NULL,
fixtures);
return (Test *)&hashes_sha256_tests;
}