test/fpsensor_crypto.cc

/* Copyright 2024 The ChromiumOS Authors
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "fpsensor/fpsensor_crypto.h"
#include "rollback.h"
#include "sha256.h"
#include "test_util.h"

#include <array>
#include <vector>

struct HmacSha256TestVector {
	std::vector<uint8_t> key;
	std::vector<std::vector<uint8_t> > messages;
	std::vector<uint8_t> result;
};

struct HkdfTestVector {
	std::vector<uint8_t> ikm;
	std::vector<uint8_t> salt;
	std::vector<uint8_t> info;
	std::vector<uint8_t> prk;
	std::vector<uint8_t> okm;
};

enum ec_error_list rollback_get_secret(uint8_t *secret)
{
	// We should not call this function in the test.
	TEST_ASSERT(false);
}

test_static int test_hmac_sha256(void)
{
	/* Test vectors from
	 * https://datatracker.ietf.org/doc/html/rfc4231#section-4 */

	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.2 */
	const HmacSha256TestVector test_vector1 = {
		.key = {
			0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
			0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
			0x0b, 0x0b,
		},
		.messages = {
			{ 'H', 'i', ' '},
			{ 'T', 'h', 'e', 'r', 'e'},
		},
		.result = {
			0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53, 0x5c,
			0xa8, 0xaf, 0xce, 0xaf, 0x0b, 0xf1, 0x2b, 0x88, 0x1d,
			0xc2, 0x00, 0xc9, 0x83, 0x3d, 0xa7, 0x26, 0xe9, 0x37,
			0x6c, 0x2e, 0x32, 0xcf, 0xf7,
		},
	};

	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.3 */
	const HmacSha256TestVector test_vector2 = {
		.key = { 'J', 'e', 'f', 'e' },
		.messages = {
			{ 'w', 'h', 'a', 't', ' '},
			{ 'd', 'o', ' '},
			{ 'y', 'a', ' '},
			{ 'w', 'a', 'n', 't', ' '},
			{ 'f', 'o', 'r', ' '},
			{ 'n', 'o', 't', 'h', 'i', 'n', 'g', '?'},
		},
		.result = {
			0x5b, 0xdc, 0xc1, 0x46, 0xbf, 0x60, 0x75, 0x4e, 0x6a,
			0x04, 0x24, 0x26, 0x08, 0x95, 0x75, 0xc7, 0x5a, 0x00,
			0x3f, 0x08, 0x9d, 0x27, 0x39, 0x83, 0x9d, 0xec, 0x58,
			0xb9, 0x64, 0xec, 0x38, 0x43,
		},
	};

	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.4 */
	const HmacSha256TestVector test_vector3 = {
		.key = {
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa,
		},
		.messages = {
			{
				0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
				0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
				0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
				0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
				0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
				0xdd, 0xdd, 0xdd, 0xdd, 0xdd
			},
		},
		.result = {
			0x77, 0x3e, 0xa9, 0x1e, 0x36, 0x80, 0x0e, 0x46, 0x85,
			0x4d, 0xb8, 0xeb, 0xd0, 0x91, 0x81, 0xa7, 0x29, 0x59,
			0x09, 0x8b, 0x3e, 0xf8, 0xc1, 0x22, 0xd9, 0x63, 0x55,
			0x14, 0xce, 0xd5, 0x65, 0xfe,
		},
	};

	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.5 */
	const HmacSha256TestVector test_vector4 = {
		.key = {
			0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
			0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
			0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
		},
		.messages = {
			{
				0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd,
				0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd,
				0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd,
				0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd,
				0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd,
				0xcd, 0xcd, 0xcd, 0xcd, 0xcd
			},
		},
		.result = {
			0x82, 0x55, 0x8a, 0x38, 0x9a, 0x44, 0x3c, 0x0e, 0xa4,
			0xcc, 0x81, 0x98, 0x99, 0xf2, 0x08, 0x3a, 0x85, 0xf0,
			0xfa, 0xa3, 0xe5, 0x78, 0xf8, 0x07, 0x7a, 0x2e, 0x3f,
			0xf4, 0x67, 0x29, 0x66, 0x5b,
		},
	};

	/*
	 * Test Vector 5 was skipped because it checks output truncation, which
	 * is not supported by hmac_sha256().
	 */

	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.7 */
	const HmacSha256TestVector test_vector6 = {
		.key = {
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
		},
		.messages = {
			{ 'T', 'e', 's', 't', ' '},
			{ 'U', 's', 'i', 'n', 'g', ' '},
			{ 'L', 'a', 'r', 'g', 'e', 'r', ' '},
			{ 'T', 'h', 'a', 'n', ' '},
			{ 'B', 'l', 'o', 'c', 'k', '-', 'S', 'i', 'z', 'e', ' '},
			{ 'K', 'e', 'y', ' '},
			{ '-', ' '},
			{ 'H', 'a', 's', 'h', ' '},
			{ 'K', 'e', 'y', ' '},
			{ 'F', 'i', 'r', 's', 't'},
		},
		.result = {
			0x60, 0xe4, 0x31, 0x59, 0x1e, 0xe0, 0xb6, 0x7f, 0x0d,
			0x8a, 0x26, 0xaa, 0xcb, 0xf5, 0xb7, 0x7f, 0x8e, 0x0b,
			0xc6, 0x21, 0x37, 0x28, 0xc5, 0x14, 0x05, 0x46, 0x04,
			0x0f, 0x0e, 0xe3, 0x7f, 0x54,
		},
	};

	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.8 */
	const HmacSha256TestVector test_vector7 = {
		.key = {
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
			0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
		},
		.messages = {
			{ 'T', 'h', 'i', 's', ' '},
			{ 'i', 's', ' '},
			{ 'a', ' '},
			{ 't', 'e', 's', 't', ' '},
			{ 'u', 's', 'i', 'n', 'g', ' '},
			{ 'a', ' '},
			{ 'l', 'a', 'r', 'g', 'e', 'r', ' '},
			{ 't', 'h', 'a', 'n', ' '},
			{ 'b', 'l', 'o', 'c', 'k', '-', 's', 'i', 'z', 'e', ' '},
			{ 'k', 'e', 'y', ' '},
			{ 'a', 'n', 'd', ' '},
			{ 'a', ' '},
			{ 'l', 'a', 'r', 'g', 'e', 'r', ' '},
			{ 't', 'h', 'a', 'n', ' '},
			{ 'b', 'l', 'o', 'c', 'k', '-', 's', 'i', 'z', 'e', ' '},
			{ 'd', 'a', 't', 'a', '.', ' '},
			{ 'T', 'h', 'e', ' '},
			{ 'k', 'e', 'y', ' '},
			{ 'n', 'e', 'e', 'd', 's', ' '},
			{ 't', 'o', ' '},
			{ 'b', 'e', ' '},
			{ 'h', 'a', 's', 'h', 'e', 'd', ' '},
			{ 'b', 'e', 'f', 'o', 'r', 'e', ' '},
			{ 'b', 'e', 'i', 'n', 'g', ' '},
			{ 'u', 's', 'e', 'd', ' '},
			{ 'b', 'y', ' '},
			{ 't', 'h', 'e', ' '},
			{ 'H', 'M', 'A', 'C', ' '},
			{ 'a', 'l', 'g', 'o', 'r', 'i', 't', 'h', 'm', '.'},
		},
		.result = {
			0x9b, 0x09, 0xff, 0xa7, 0x1b, 0x94, 0x2f, 0xcb, 0x27,
			0x63, 0x5f, 0xbc, 0xd5, 0xb0, 0xe9, 0x44, 0xbf, 0xdc,
			0x63, 0x64, 0x4f, 0x07, 0x13, 0x93, 0x8a, 0x7f, 0x51,
			0x53, 0x5c, 0x3a, 0x35, 0xe2,
		},
	};

	const std::array test_vectors = { test_vector1, test_vector2,
					  test_vector3, test_vector4,
					  test_vector6, test_vector7 };

	for (const auto &test_vector : test_vectors) {
		const auto &expected_result = test_vector.result;
		std::array<uint8_t, SHA256_DIGEST_LENGTH> actual_result{};

		std::vector<std::span<const uint8_t> > inputs(
			test_vector.messages.size());
		for (const auto &message : test_vector.messages) {
			inputs.emplace_back(message);
		}

		TEST_ASSERT(hmac_sha256(test_vector.key, inputs,
					actual_result) == EC_SUCCESS);
		TEST_ASSERT_ARRAY_EQ(expected_result.data(),
				     actual_result.data(),
				     expected_result.size());
	}

	return EC_SUCCESS;
}

test_static int test_hmac_sha256_with_empty_spans(void)
{
	/* https://datatracker.ietf.org/doc/html/rfc4231#section-4.2 */
	std::array<const uint8_t, 20> key{
		0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
		0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
	};

	std::array<const uint8_t, 8> message{
		'H', 'i', ' ', 'T', 'h', 'e', 'r', 'e',
	};

	std::array<const uint8_t, SHA256_DIGEST_LENGTH> expected_result{
		0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53,
		0x5c, 0xa8, 0xaf, 0xce, 0xaf, 0x0b, 0xf1, 0x2b,
		0x88, 0x1d, 0xc2, 0x00, 0xc9, 0x83, 0x3d, 0xa7,
		0x26, 0xe9, 0x37, 0x6c, 0x2e, 0x32, 0xcf, 0xf7,
	};

	std::span message_span{ message };

	std::array inputs{
		message_span.subspan(0, 3),
		std::span<const uint8_t>{},
		message_span.subspan(3),
	};

	std::array<uint8_t, SHA256_DIGEST_LENGTH> actual_result{};

	TEST_ASSERT(hmac_sha256(key, inputs, actual_result) == EC_SUCCESS);
	TEST_ASSERT_ARRAY_EQ(expected_result.data(), actual_result.data(),
			     expected_result.size());

	return EC_SUCCESS;
}

test_static int test_hkdf_expand(void)
{
	/* Test vectors from
	 * https://datatracker.ietf.org/doc/html/rfc5869#appendix-A */

	/* https://datatracker.ietf.org/doc/html/rfc5869#appendix-A.1 */
	const HkdfTestVector test_vector1 = {
		.ikm = {
			0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
			0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
			0x0b, 0x0b, 0x0b, 0x0b,
		},
		.salt =  {
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
			0x09, 0x0a, 0x0b, 0x0c,
		},
		.info = {
			0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
			0xf9,
		},
		.prk = {
			0x07, 0x77, 0x09, 0x36, 0x2c, 0x2e, 0x32, 0xdf, 0x0d,
			0xdc, 0x3f, 0x0d, 0xc4, 0x7b, 0xba, 0x63, 0x90, 0xb6,
			0xc7, 0x3b, 0xb5, 0x0f, 0x9c, 0x31, 0x22, 0xec, 0x84,
			0x4a, 0xd7, 0xc2, 0xb3, 0xe5,
		},
		.okm = {
			0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a, 0x90,
			0x43, 0x4f, 0x64, 0xd0, 0x36, 0x2f, 0x2a, 0x2d, 0x2d,
			0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c, 0x5d, 0xb0, 0x2d,
			0x56, 0xec, 0xc4, 0xc5, 0xbf, 0x34, 0x00, 0x72, 0x08,
			0xd5, 0xb8, 0x87, 0x18, 0x58, 0x65,
		},
	};

	/* https://datatracker.ietf.org/doc/html/rfc5869#appendix-A.2 */
	const HkdfTestVector test_vector2 = {
		.ikm = {
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
			0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
			0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a,
			0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
			0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
			0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
			0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
			0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
			0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
		},
		.salt = {
			0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
			0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71,
			0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
			0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83,
			0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c,
			0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
			0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e,
			0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
			0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf
		},
		.info = {
			0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8,
			0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1,
			0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
			0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3,
			0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc,
			0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5,
			0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee,
			0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
			0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
		},
		.prk = {
			0x06, 0xa6, 0xb8, 0x8c, 0x58, 0x53, 0x36, 0x1a, 0x06,
			0x10, 0x4c, 0x9c, 0xeb, 0x35, 0xb4, 0x5c, 0xef, 0x76,
			0x00, 0x14, 0x90, 0x46, 0x71, 0x01, 0x4a, 0x19, 0x3f,
			0x40, 0xc1, 0x5f, 0xc2, 0x44,
		},
		.okm = {
			0xb1, 0x1e, 0x39, 0x8d, 0xc8, 0x03, 0x27, 0xa1, 0xc8,
			0xe7, 0xf7, 0x8c, 0x59, 0x6a, 0x49, 0x34, 0x4f, 0x01,
			0x2e, 0xda, 0x2d, 0x4e, 0xfa, 0xd8, 0xa0, 0x50, 0xcc,
			0x4c, 0x19, 0xaf, 0xa9, 0x7c, 0x59, 0x04, 0x5a, 0x99,
			0xca, 0xc7, 0x82, 0x72, 0x71, 0xcb, 0x41, 0xc6, 0x5e,
			0x59, 0x0e, 0x09, 0xda, 0x32, 0x75, 0x60, 0x0c, 0x2f,
			0x09, 0xb8, 0x36, 0x77, 0x93, 0xa9, 0xac, 0xa3, 0xdb,
			0x71, 0xcc, 0x30, 0xc5, 0x81, 0x79, 0xec, 0x3e, 0x87,
			0xc1, 0x4c, 0x01, 0xd5, 0xc1, 0xf3, 0x43, 0x4f, 0x1d,
			0x87,
		},
	};

	/* https://datatracker.ietf.org/doc/html/rfc5869#appendix-A.3 */
	const HkdfTestVector test_vector3 = {
		.ikm = {
			0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
			0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
			0x0b, 0x0b, 0x0b, 0x0b,
		},
		.salt = {},
		.info = {},
		.prk = {
			0x19, 0xef, 0x24, 0xa3, 0x2c, 0x71, 0x7b, 0x16, 0x7f,
			0x33, 0xa9, 0x1d, 0x6f, 0x64, 0x8b, 0xdf, 0x96, 0x59,
			0x67, 0x76, 0xaf, 0xdb, 0x63, 0x77, 0xac, 0x43, 0x4c,
			0x1c, 0x29, 0x3c, 0xcb, 0x04,
		},
		.okm = {
			0x8d, 0xa4, 0xe7, 0x75, 0xa5, 0x63, 0xc1, 0x8f, 0x71,
			0x5f, 0x80, 0x2a, 0x06, 0x3c, 0x5a, 0x31, 0xb8, 0xa1,
			0x1f, 0x5c, 0x5e, 0xe1, 0x87, 0x9e, 0xc3, 0x45, 0x4e,
			0x5f, 0x3c, 0x73, 0x8d, 0x2d, 0x9d, 0x20, 0x13, 0x95,
			0xfa, 0xa4, 0xb6, 0x1a, 0x96, 0xc8,
		}
	};

	const std::array test_vectors = { test_vector1, test_vector2,
					  test_vector3 };

	for (const auto &test_vector : test_vectors) {
		const auto &expected_okm = test_vector.okm;
		std::vector<uint8_t> actual_okm(expected_okm.size());

		std::span test_vector_ikm_span{ test_vector.ikm };
		std::array ikm{
			test_vector_ikm_span.subspan(0, 1),
			test_vector_ikm_span.subspan(1, 4),
			test_vector_ikm_span.subspan(5, 2),
			test_vector_ikm_span.subspan(7, 5),
			test_vector_ikm_span.subspan(12, 3),
			test_vector_ikm_span.subspan(15),
		};

		TEST_ASSERT(hkdf_sha256(actual_okm, ikm, test_vector.salt,
					test_vector.info));
		TEST_ASSERT_ARRAY_EQ(expected_okm.data(), actual_okm.data(),
				     expected_okm.size());
	}

	/* OKM size too big. */
	std::vector<uint8_t> unused_output(256 * SHA256_DIGEST_SIZE);
	const auto &test_vector = test_vector1;
	std::array ikm{
		std::span{ test_vector.ikm },
	};

	TEST_ASSERT(!hkdf_sha256(unused_output, ikm, test_vector.salt,
				 test_vector.info));

	return EC_SUCCESS;
}

test_static ec_error_list test_aes_128_gcm_encrypt_in_place()
{
	const FpEncryptionKey key = { {
		0x00,
		0x01,
		0x02,
		0x03,
		0x04,
		0x05,
		0x06,
		0x07,
		0x08,
		0x09,
		0x0A,
		0x0B,
		0x0C,
		0x0D,
		0x0E,
		0x0F,
	} };
	std::array<uint8_t, 16> plaintext = { 0x00, 0x00, 0x00, 0x00,
					      0x00, 0x00, 0x00, 0x00,
					      0x00, 0x00, 0x00, 0x00,
					      0x00, 0x00, 0x00, 0x00 };
	constexpr std::array<uint8_t, 16> expected_ciphertext = {
		0x9b, 0xde, 0x09, 0x85, 0x27, 0x8c, 0x70, 0x89,
		0x54, 0x28, 0xcc, 0x4e, 0x7a, 0x36, 0xb1, 0x2d,
	};
	constexpr std::array<uint8_t, FP_CONTEXT_NONCE_BYTES> nonce = {
		0x0B, 0x0A, 0x09, 0x08, 0x07, 0x06,
		0x05, 0x04, 0x03, 0x02, 0x01, 0x00
	};
	std::array<uint8_t, FP_CONTEXT_TAG_BYTES> tag{};
	constexpr std::array<uint8_t, FP_CONTEXT_TAG_BYTES> expected_tag = {
		0x85, 0x6e, 0xd2, 0x04, 0x1f, 0xe0, 0x8f, 0x0b,
		0xa1, 0xab, 0x8f, 0xb3, 0x70, 0x75, 0xab, 0x48,
	};

	ec_error_list ret =
		aes_128_gcm_encrypt(key, plaintext, plaintext, nonce, tag);
	TEST_EQ(ret, EC_SUCCESS, "%d");
	TEST_ASSERT_ARRAY_EQ(plaintext.data(), expected_ciphertext.data(),
			     plaintext.size());
	TEST_ASSERT_ARRAY_EQ(tag.data(), expected_tag.data(), tag.size());

	return EC_SUCCESS;
}

test_static ec_error_list test_aes_128_gcm_decrypt_in_place()
{
	const FpEncryptionKey key = { {
		0x00,
		0x01,
		0x02,
		0x03,
		0x04,
		0x05,
		0x06,
		0x07,
		0x08,
		0x09,
		0x0A,
		0x0B,
		0x0C,
		0x0D,
		0x0E,
		0x0F,
	} };
	/* Using the same values as from test_aes_gcm_encrypt_in_place means we
	 * should get back the original plaintext from that function.
	 */
	constexpr std::array<uint8_t, 16> expected_plaintext = {
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	};
	std::array<uint8_t, 16> ciphertext = {
		0x9b, 0xde, 0x09, 0x85, 0x27, 0x8c, 0x70, 0x89,
		0x54, 0x28, 0xcc, 0x4e, 0x7a, 0x36, 0xb1, 0x2d,
	};
	constexpr std::array<uint8_t, FP_CONTEXT_NONCE_BYTES> nonce = {
		0x0B, 0x0A, 0x09, 0x08, 0x07, 0x06,
		0x05, 0x04, 0x03, 0x02, 0x01, 0x00
	};
	constexpr std::array<uint8_t, FP_CONTEXT_TAG_BYTES> tag = {
		0x85, 0x6e, 0xd2, 0x04, 0x1f, 0xe0, 0x8f, 0x0b,
		0xa1, 0xab, 0x8f, 0xb3, 0x70, 0x75, 0xab, 0x48,
	};

	ec_error_list ret =
		aes_128_gcm_decrypt(key, ciphertext, ciphertext, nonce, tag);
	;
	TEST_EQ(ret, EC_SUCCESS, "%d");
	TEST_ASSERT_ARRAY_EQ(ciphertext.data(), expected_plaintext.data(),
			     ciphertext.size());

	return EC_SUCCESS;
}

test_static ec_error_list test_aes_128_gcm_encrypt_invalid_nonce_size()
{
	const FpEncryptionKey key{};
	std::array<uint8_t, 16> text{};
	std::array<uint8_t, FP_CONTEXT_TAG_BYTES> tag{};

	/* Use an invalid nonce size. */
	constexpr std::array<uint8_t, FP_CONTEXT_NONCE_BYTES - 1> nonce{};

	ec_error_list ret = aes_128_gcm_encrypt(key, text, text, nonce, tag);
	TEST_EQ(ret, EC_ERROR_INVAL, "%d");

	return EC_SUCCESS;
}

test_static ec_error_list test_aes_128_gcm_decrypt_invalid_nonce_size()
{
	const FpEncryptionKey key{};
	std::array<uint8_t, 16> text{};
	constexpr std::array<uint8_t, FP_CONTEXT_TAG_BYTES> tag{};

	/* Use an invalid nonce size. */
	constexpr std::array<uint8_t, FP_CONTEXT_NONCE_BYTES - 1> nonce{};

	ec_error_list ret = aes_128_gcm_decrypt(key, text, text, nonce, tag);
	TEST_EQ(ret, EC_ERROR_INVAL, "%d");
	return EC_SUCCESS;
}

test_static ec_error_list test_aes_128_gcm_encrypt_invalid_key_size()
{
	std::array<uint8_t, 16> text{};
	std::array<uint8_t, FP_CONTEXT_TAG_BYTES> tag{};
	constexpr std::array<uint8_t, FP_CONTEXT_NONCE_BYTES> nonce{};

	/* Use an invalid key size. Key must be exactly 128 bits. */
	BUILD_ASSERT(sizeof(FpEncryptionKey) == 16);
	constexpr std::array<uint8_t, 15> key{};

	ec_error_list ret = aes_128_gcm_encrypt(key, text, text, nonce, tag);
	TEST_EQ(ret, EC_ERROR_UNKNOWN, "%d");

	return EC_SUCCESS;
}

test_static ec_error_list test_aes_128_gcm_decrypt_invalid_key_size()
{
	std::array<uint8_t, 16> text{};
	constexpr std::array<uint8_t, FP_CONTEXT_TAG_BYTES> tag{};
	constexpr std::array<uint8_t, FP_CONTEXT_NONCE_BYTES> nonce{};

	/* Use an invalid key size. Key must be exactly 128 bits. */
	BUILD_ASSERT(sizeof(FpEncryptionKey) == 16);
	constexpr std::array<uint8_t, 15> key{};

	ec_error_list ret = aes_128_gcm_decrypt(key, text, text, nonce, tag);
	TEST_EQ(ret, EC_ERROR_UNKNOWN, "%d");
	return EC_SUCCESS;
}

void run_test(int argc, const char **argv)
{
	RUN_TEST(test_aes_128_gcm_encrypt_in_place);
	RUN_TEST(test_aes_128_gcm_decrypt_in_place);
	RUN_TEST(test_aes_128_gcm_encrypt_invalid_nonce_size);
	RUN_TEST(test_aes_128_gcm_decrypt_invalid_nonce_size);
	RUN_TEST(test_aes_128_gcm_encrypt_invalid_key_size);
	RUN_TEST(test_aes_128_gcm_decrypt_invalid_key_size);
	RUN_TEST(test_hmac_sha256);
	RUN_TEST(test_hmac_sha256_with_empty_spans);
	RUN_TEST(test_hkdf_expand);

	test_print_result();
}