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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
* @file fpsensor_crypto_mock.c
* @brief Mock fpsensor_crypto library
*/
#include "sha256.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "assert.h"
#include "compile_time_macros.h"
#include "console.h"
#include "ec_commands.h"
#include "fpsensor_private.h"
#include "mock/fpsensor_crypto_mock.h"
#ifndef TEST_BUILD
#error "Mocks should only be in the test build."
#endif
struct mock_ctrl_fpsensor_crypto mock_ctrl_fpsensor_crypto =
MOCK_CTRL_DEFAULT_FPSENSOR_CRYPTO;
#define MESSAGE_ZERO_IDX 0
#define MESSAGE_FF_IDX 1
typedef uint8_t key_message_pair[FP_POSITIVE_MATCH_SECRET_BYTES];
key_message_pair fake_fpsensor_crypto[] = {
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }
};
BUILD_ASSERT(sizeof(key_message_pair) == FP_POSITIVE_MATCH_SECRET_BYTES);
/* Mock compute_hmac_sha256 for unit or fuzz tests. */
void compute_hmac_sha256(uint8_t *output, const uint8_t *key, const int key_len,
const uint8_t *message, const int message_len)
{
switch (mock_ctrl_fpsensor_crypto.output_type) {
case MOCK_CTRL_FPSENSOR_CRYPTO_SHA256_TYPE_REAL:
hmac_SHA256(output, key, key_len, message, message_len);
break;
case MOCK_CTRL_FPSENSOR_CRYPTO_SHA256_TYPE_ZEROS:
memcpy(output, fake_fpsensor_crypto[MESSAGE_ZERO_IDX],
FP_POSITIVE_MATCH_SECRET_BYTES);
break;
case MOCK_CTRL_FPSENSOR_CRYPTO_SHA256_TYPE_FF:
memcpy(output, fake_fpsensor_crypto[MESSAGE_FF_IDX],
FP_POSITIVE_MATCH_SECRET_BYTES);
break;
default:
assert(0);
break;
};
}
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