// 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/p25/kmm/KMMRekeyCommand.h"
#include "common/Log.h"
#include "common/Utils.h"

using namespace p25;
using namespace p25::crypto;
using namespace p25::defines;
using namespace p25::kmm;

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

TEST_CASE("KMM_ReKey_CBC", "[P25 KMM Rekey Command CBC Test]") {
    SECTION("P25_KMM_ReKey_CBC_Test") {
        bool failed = false;

        INFO("P25 KMM ReKey Test");

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

        // 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
        };

        // 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
        };

        // Encrypted Key Frame
        uint8_t testWrappedKeyFrame[40U] = 
        {
            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
        };

        uint8_t encryptMI[] =
        {
            0x70, 0x30, 0xF1, 0xF7, 0x65, 0x69, 0x26, 0x67
        };

        // final encrypted block
        uint8_t encryptedBlock[] =
        {
            0x67, 0x75, 0xB1, 0xD1, 0x8A, 0xBD, 0xCF, 0x86, 0x08, 0x54, 0xDF, 0x09, 0x8E, 0xA3, 0x41, 0x29,
            0x13, 0x2A, 0x0E, 0x48, 0x4C, 0xCC, 0x5C, 0xAE, 0x80, 0x08, 0x0B, 0x19, 0xF7, 0x08, 0xAE, 0x8F,
            0xB8, 0x40, 0xAA, 0x2E, 0x3E, 0x5E, 0xCD, 0x03, 0x73, 0x52, 0x75, 0xFE, 0xE2, 0x88, 0x0E, 0x6D,
            0xDD, 0x00, 0xC1, 0x11, 0x42, 0x8F, 0xEE, 0x39, 0xC6, 0x2B, 0xF3, 0xC1, 0xD2, 0xEE, 0x3B, 0xEB,
            0xBB, 0x7C, 0x44, 0xA5, 0xE3, 0xC9, 0x30, 0x8C, 0x5D, 0xE9, 0x17, 0x84, 0x7C, 0x17, 0xAF, 0x23
        };

        Utils::dump(2U, "P25_KMM_ReKey_CBC_Test, MAC TEK", macTek, 32U);
        Utils::dump(2U, "P25_KMM_ReKey_CBC_Test, OFB MI", encryptMI, 8U);
        Utils::dump(2U, "P25_KMM_ReKey_CBC_Test, DataBlock", dataBlock, 80U);
        Utils::dump(2U, "P25_KMM_ReKey_CBC_Test, EncryptedBlock", encryptedBlock, 80U);

        KMMRekeyCommand outKmm = KMMRekeyCommand();

        outKmm.setDecryptInfoFmt(KMM_DECRYPT_INSTRUCT_NONE);
        outKmm.setSrcLLId(0x712B1DU);
        outKmm.setDstLLId(0x643BA8U);

        outKmm.setMACType(KMM_MAC::ENH_MAC);
        outKmm.setMACAlgId(ALGO_AES_256);
        outKmm.setMACKId(0x2F62U);
        outKmm.setMACFormat(KMM_MAC_FORMAT_CBC);

        outKmm.setMessageNumber(0x1772U);

        outKmm.setAlgId(ALGO_AES_256);
        outKmm.setKId(0x50BCU);

        KeysetItem ks;
        ks.keysetId(1U);
        ks.algId(ALGO_AES_256); // we currently can only OTAR AES256 keys
        ks.keyLength(P25DEF::MAX_WRAPPED_ENC_KEY_LENGTH_BYTES);

        p25::kmm::KeyItem ki = p25::kmm::KeyItem();
        ki.keyFormat(0U);
        ki.sln(0U);
        ki.kId(0x4983U);

        ki.setKey(testWrappedKeyFrame, 40U);
        ks.push_back(ki);

        std::vector<KeysetItem> keysets;
        keysets.push_back(ks);

        outKmm.setKeysets(keysets);

        UInt8Array kmmFrame = std::make_unique<uint8_t[]>(outKmm.fullLength());
        outKmm.encode(kmmFrame.get());
        outKmm.generateMAC(macTek, kmmFrame.get());

        Utils::dump(2U, "P25_KMM_ReKey_CBC_Test, GeneratedDataBlock", kmmFrame.get(), outKmm.fullLength());

        for (uint32_t i = 0; i < outKmm.fullLength(); i++) {
            if (kmmFrame.get()[i] != dataBlock[i]) {
                ::LogError("T", "P25_KMM_ReKey_CBC_Test, INVALID AT IDX %d", i);
                failed = true;
            }
        }

        P25Crypto crypto;
        crypto.setMI(encryptMI);
        crypto.setTEKAlgoId(ALGO_AES_256);
        crypto.setKey(macTek, 32U);
        crypto.generateKeystream();

        crypto.cryptAES_PDU(kmmFrame.get(), outKmm.fullLength());
        
        Utils::dump(2U, "P25_KMM_ReKey_CBC_Test, EncryptedDataBlock", kmmFrame.get(), outKmm.fullLength());

        for (uint32_t i = 0; i < outKmm.fullLength(); i++) {
            if (kmmFrame.get()[i] != encryptedBlock[i]) {
                ::LogError("T", "P25_KMM_ReKey_CBC_Test, INVALID AT IDX %d", i);
                failed = true;
            }
        }

        REQUIRE(failed==false);
    }
}