// SPDX-License-Identifier: GPL-2.0-only
/*
 * Digital Voice Modem - Test Suite
 * GPLv2 Open Source. Use is subject to license terms.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 *  Copyright (C) 2025 Bryan Biedenkapp, N2PLL
 *
 */
#include "host/Defines.h"
#include "common/p25/P25Defines.h"
#include "common/p25/Crypto.h"
#include "common/Log.h"
#include "common/Utils.h"

using namespace p25::defines;

#include <catch2/catch_test_macros.hpp>
#include <stdlib.h>
#include <time.h>

TEST_CASE("AES MAC CBC-MAC Test", "[aes][p25_mac_cbc]") {
    bool failed = false;

    INFO("P25 AES256 MAC CBC-MAC Test");

    srand((unsigned int)time(NULL));

    // example data taken from TIA-102.AACA-C-2023 Section 14.3.4

    // MAC TEK
    uint8_t macTek[] =
    {
        0x16, 0x85, 0x62, 0x45, 0x3B, 0x3E, 0x7F, 0x61, 0x8D, 0x68, 0xB3, 0x87, 0xE0, 0xB9, 0x97, 0xE1,
        0xFB, 0x0F, 0x26, 0x4F, 0xA8, 0x3B, 0x74, 0xE4, 0x3B, 0x17, 0x29, 0x17, 0xBD, 0x39, 0x33, 0x9F
    };

    // expected CBC key
    uint8_t expectedCBC[] =
    {
        0x09, 0xE7, 0x11, 0x7B, 0x4E, 0x42, 0x06, 0xDE, 0xD3, 0x66, 0xEA, 0x5D, 0x69, 0x33, 0x01, 0xCA,
        0x83, 0x21, 0xBC, 0xC2, 0x0F, 0xA5, 0x05, 0xDF, 0x12, 0x67, 0xDC, 0x2A, 0xE4, 0x58, 0xA0, 0x57
    };

    // data block
    uint8_t dataBlock[] = 
    {
        0x1E, 0x00, 0x4D, 0xA8, 0x64, 0x3B, 0xA8, 0x71, 0x2B, 0x1D, 0x17, 0x72, 0x00, 0x84, 0x50, 0xBC,
        0x01, 0x00, 0x01, 0x84, 0x28, 0x01, 0x00, 0x00, 0x00, 0x49, 0x83, 0x80, 0x28, 0x9C, 0xF6, 0x35,
        0xFB, 0x68, 0xD3, 0x45, 0xD3, 0x4F, 0x62, 0xEF, 0x06, 0x3B, 0xA4, 0xE0, 0x5C, 0xAE, 0x47, 0x56,
        0xE7, 0xD3, 0x04, 0x46, 0xD1, 0xF0, 0x7C, 0x6E, 0xB4, 0xE9, 0xE0, 0x84, 0x09, 0x45, 0x37, 0x23,
        0x72, 0xFB, 0x80, 0x42, 0xA0, 0x91, 0x56, 0xF0, 0xD4, 0x72, 0x1C, 0x08, 0x84, 0x2F, 0x62, 0x40
    };

    uint8_t expectedMAC[8U];

    Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, TEK", macTek, 32U);
    Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, DataBlock", dataBlock, 80U);
    Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, Expected CBC-MAC Key", expectedCBC, 32U);

    uint16_t fullLength = 0U;
    uint16_t messageLength = GET_UINT16(dataBlock, 1U);
    fullLength = messageLength + 3U;
    bool hasMN = ((dataBlock[3U] >> 4U) & 0x03U) == 0x02U;
    uint8_t macType = (dataBlock[3U] >> 2U) & 0x03U;

    ::LogInfoEx("T", "P25_MAC_CBC_Crypto_Test, messageLength = %u, hasMN = %u, macType = $%02X", messageLength, hasMN, macType);

    switch (macType) {
    case KMM_MAC::DES_MAC:
        {
            uint8_t macLength = 4U;
            ::memset(expectedMAC, 0x00U, macLength);

            uint8_t macAlgId = dataBlock[fullLength - 4U];
            uint16_t macKId = GET_UINT16(dataBlock, fullLength - 3U);
            uint8_t macFormat = dataBlock[fullLength - 1U];

            ::memcpy(expectedMAC, dataBlock + fullLength - (macLength + 5U), macLength);

            ::LogInfoEx("T", "P25_MAC_CBC_Crypto_Test, macAlgId = $%02X, macKId = $%04X, macFormat = $%02X", macAlgId, macKId, macFormat);
            Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, Expected MAC", expectedMAC, macLength);
        }
        break;

    case KMM_MAC::ENH_MAC:
        {
            uint8_t macLength = 8U;
            ::memset(expectedMAC, 0x00U, macLength);

            uint8_t macAlgId = dataBlock[fullLength - 4U];
            uint16_t macKId = GET_UINT16(dataBlock, fullLength - 3U);
            uint8_t macFormat = dataBlock[fullLength - 1U];

            ::memcpy(expectedMAC, dataBlock + fullLength - (macLength + 5U), macLength);

            ::LogInfoEx("T", "P25_MAC_CBC_Crypto_Test, macAlgId = $%02X, macKId = $%04X, macFormat = $%02X", macAlgId, macKId, macFormat);
            Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, Expected MAC", expectedMAC, macLength);
        }
        break;

    case KMM_MAC::NO_MAC:
        break;

    default:
        ::LogError(LOG_P25, "P25_MAC_CBC_Crypto_Test, unknown KMM MAC inventory type value, macType = $%02X", macType);
        break;
    }

    p25::crypto::P25Crypto crypto;

    UInt8Array macKey = crypto.cryptAES_KMM_CBC_KDF(macTek, dataBlock, fullLength);
    Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, CBC MAC Key", macKey.get(), 32U);

    for (uint32_t i = 0; i < 32U; i++) {
        if (macKey[i] != expectedCBC[i]) {
            ::LogError("T", "P25_MAC_CBC_Crypto_Test, INVALID AT IDX %d", i);
            failed = true;
        }
    }

    UInt8Array mac = crypto.cryptAES_KMM_CBC(macKey.get(), dataBlock, fullLength);
    Utils::dump(2U, "P25_MAC_CBC_Crypto_Test, MAC", mac.get(), 8U);

    for (uint32_t i = 0; i < 8U; i++) {
        if (mac[i] != expectedMAC[i]) {
            ::LogError("T", "P25_MAC_CBC_Crypto_Test, INVALID AT IDX %d", i);
            failed = true;
        }
    }

    REQUIRE(failed==false);
}