ntptun/tests/test_sha256.cpp

#include "ntptun/Bytes.hpp"
#include "ntptun/Sha256.hpp"
#include "TestUtil.hpp"

#include <string>

using namespace ntptun;

namespace {

bool digest_equals(const Sha256::Digest& got, const std::string& hex) {
    const auto expected = from_hex(hex);
    if (!expected || expected->size() != got.size()) {
        return false;
    }
    for (std::size_t i = 0; i < got.size(); ++i) {
        if (got[i] != (*expected)[i]) {
            return false;
        }
    }
    return true;
}

Sha256::Digest hash_str(const std::string& s) {
    return Sha256::hash(reinterpret_cast<const Byte*>(s.data()), s.size());
}

}  // namespace

void run_tests() {
    // FIPS 180-4 / NIST test vectors.
    CHECK(digest_equals(
        hash_str(""),
        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"));
    CHECK(digest_equals(
        hash_str("abc"),
        "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"));
    CHECK(digest_equals(
        hash_str("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"),
        "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1"));

    // A message spanning multiple blocks (> 55 bytes) exercises padding paths.
    std::string long_msg(1000, 'a');
    CHECK(digest_equals(
        hash_str(long_msg),
        "41edece42d63e8d9bf515a9ba6932e1c20cbc9f5a5d134645adb5db1b9737ea3"));

    // Incremental updates must match the one-shot result.
    Sha256 h;
    h.update(reinterpret_cast<const Byte*>("ab"), 2);
    h.update(reinterpret_cast<const Byte*>("c"), 1);
    CHECK(digest_equals(
        h.finish(),
        "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"));
}

TEST_MAIN()