#include <gtest/gtest.h>

#include "Cipher/Arc4/Arc4Gen.hpp"

using namespace Chaos::Cipher::Arc4;

TEST(Arc4GenTests, RFCTest)
{
    Arc4Gen gen;

    // Key: 0x0102030405 (40 bits)

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0xb2, 0x39, 0x63, 0x05, 0xf0, 0x3d, 0xc0, 0x27,
            0xcc, 0xc3, 0x52, 0x4a, 0x0a, 0x11, 0x18, 0xa8,
            0x69, 0x82, 0x94, 0x4f, 0x18, 0xfc, 0x82, 0xd5,
            0x89, 0xc4, 0x03, 0xa4, 0x7a, 0x0d, 0x09, 0x19
        };

        std::array<uint8_t, 32> fact;

        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x28, 0xcb, 0x11, 0x32, 0xc9, 0x6c, 0xe2, 0x86,
            0x42, 0x1d, 0xca, 0xad, 0xb8, 0xb6, 0x9e, 0xae,
            0x1c, 0xfc, 0xf6, 0x2b, 0x03, 0xed, 0xdb, 0x64,
            0x1d, 0x77, 0xdf, 0xcf, 0x7f, 0x8d, 0x8c, 0x93
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(240);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x42, 0xb7, 0xd0, 0xcd, 0xd9, 0x18, 0xa8, 0xa3,
            0x3d, 0xd5, 0x17, 0x81, 0xc8, 0x1f, 0x40, 0x41,
            0x64, 0x59, 0x84, 0x44, 0x32, 0xa7, 0xda, 0x92,
            0x3c, 0xfb, 0x3e, 0xb4, 0x98, 0x06, 0x61, 0xf6
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(496);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x45, 0x12, 0x90, 0x48, 0xe6, 0xa0, 0xed, 0x0b,
            0x56, 0xb4, 0x90, 0x33, 0x8f, 0x07, 0x8d, 0xa5,
            0x30, 0xab, 0xbc, 0xc7, 0xc2, 0x0b, 0x01, 0x60,
            0x9f, 0x23, 0xee, 0x2d, 0x5f, 0x6b, 0xb7, 0xdf
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(1008);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x1e, 0xb1, 0x4a, 0x0c, 0x13, 0xb3, 0xbf, 0x47,
            0xfa, 0x2a, 0x0b, 0xa9, 0x3a, 0xd4, 0x5b, 0x8b,
            0xcc, 0x58, 0x2f, 0x8b, 0xa9, 0xf2, 0x65, 0xe2,
            0xb1, 0xbe, 0x91, 0x12, 0xe9, 0x75, 0xd2, 0xd7
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(2032);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x06, 0x83, 0x26, 0xa2, 0x11, 0x84, 0x16, 0xd2,
            0x1f, 0x9d, 0x04, 0xb2, 0xcd, 0x1c, 0xa0, 0x50,
            0xff, 0x25, 0xb5, 0x89, 0x95, 0x99, 0x67, 0x07,
            0xe5, 0x1f, 0xbd, 0xf0, 0x8b, 0x34, 0xd8, 0x75
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(4080);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x06, 0x83, 0x26, 0xa2, 0x11, 0x84, 0x16, 0xd2,
            0x1f, 0x9d, 0x04, 0xb2, 0xcd, 0x1c, 0xa0, 0x50,
            0xff, 0x25, 0xb5, 0x89, 0x95, 0x99, 0x67, 0x07,
            0xe5, 0x1f, 0xbd, 0xf0, 0x8b, 0x34, 0xd8, 0x75
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(4080);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    // Key: 0x0102030405060708090a (80 bits)

    {
        uint8_t key[] =
        {
            0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
            0x08, 0x09, 0x0a
        };

        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0xed, 0xe3, 0xb0, 0x46, 0x43, 0xe5, 0x86, 0xcc,
            0x90, 0x7d, 0xc2, 0x18, 0x51, 0x70, 0x99, 0x02,
            0x03, 0x51, 0x6b, 0xa7, 0x8f, 0x41, 0x3b, 0xeb,
            0x22, 0x3a, 0xa5, 0xd4, 0xd2, 0xdf, 0x67, 0x11
        };

        std::array<uint8_t, 32> fact;

        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] =
        {
            0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
            0x08, 0x09, 0x0a
        };

        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0xb5, 0x5a, 0x0a, 0x5b, 0x51, 0xa1, 0x2a, 0x8b,
            0xe3, 0x48, 0x99, 0xc3, 0xe0, 0x47, 0x51, 0x1a,
            0xd9, 0xa0, 0x9c, 0xea, 0x3c, 0xe7, 0x5f, 0xe3,
            0x96, 0x98, 0x07, 0x03, 0x17, 0xa7, 0x13, 0x39
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(2032);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    // Key: 0x0102030405060708090a0b0c0d0e0f10 (128 bits)

    {
        uint8_t key[] =
        {
            0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
            0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
            0x0f, 0x10
        };

        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0x9a, 0xc7, 0xcc, 0x9a, 0x60, 0x9d, 0x1e, 0xf7,
            0xb2, 0x93, 0x28, 0x99, 0xcd, 0xe4, 0x1b, 0x97,
            0x52, 0x48, 0xc4, 0x95, 0x90, 0x14, 0x12, 0x6a,
            0x6e, 0x8a, 0x84, 0xf1, 0x1d, 0x1a, 0x9e, 0x1c
        };

        std::array<uint8_t, 32> fact;

        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t key[] =
        {
            0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
            0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
            0x0f, 0x10
        };

        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0xd0, 0x3d, 0x1b, 0xc0, 0x3c, 0xd3, 0x3d, 0x70,
            0xdf, 0xf9, 0xfa, 0x5d, 0x71, 0x96, 0x3e, 0xbd,
            0x8a, 0x44, 0x12, 0x64, 0x11, 0xea, 0xa7, 0x8b,
            0xd5, 0x1e, 0x8d, 0x87, 0xa8, 0x87, 0x9b, 0xf5
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(2032);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    // Key: 0x0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20 (256 bits)

    {
        uint8_t 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, 0x1a, 0x1b, 0x1c,
            0x1d, 0x1e, 0x1f, 0x20
        };

        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0xea, 0xa6, 0xbd, 0x25, 0x88, 0x0b, 0xf9, 0x3d,
            0x3f, 0x5d, 0x1e, 0x4c, 0xa2, 0x61, 0x1d, 0x91,
            0xcf, 0xa4, 0x5c, 0x9f, 0x7e, 0x71, 0x4b, 0x54,
            0xbd, 0xfa, 0x80, 0x02, 0x7c, 0xb1, 0x43, 0x80
        };

        std::array<uint8_t, 32> fact;

        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }

    {
        uint8_t 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, 0x1a, 0x1b, 0x1c,
            0x1d, 0x1e, 0x1f, 0x20
        };

        gen.Rekey(key, key + std::size(key));

        std::array<uint8_t, 32> expected =
        {
            0xf6, 0x56, 0xab, 0xcc, 0xf8, 0x8d, 0xd8, 0x27,
            0x02, 0x7b, 0x2c, 0xe9, 0x17, 0xd4, 0x64, 0xec,
            0x18, 0xb6, 0x25, 0x03, 0xbf, 0xbc, 0x07, 0x7f,
            0xba, 0xbb, 0x98, 0xf2, 0x0d, 0x98, 0xab, 0x34
        };

        std::array<uint8_t, 32> fact;

        gen.Drop(2032);
        gen.Generate(fact.begin(), fact.size());

        ASSERT_EQ(expected, fact);
    }
}

TEST(Arc4GenTests, TooSmallKeyTest)
{
    {
        const char * key = "smal";

        Arc4Gen gen;
        ASSERT_THROW(gen.Rekey(key, key + strlen(key)), Chaos::Service::ChaosException);

        ASSERT_THROW(Arc4Gen(key, key + strlen(key)), Chaos::Service::ChaosException);
    }
}

TEST(Arc4GenTests, UninitializedGenTest)
{
    std::array<uint8_t, 10> out;

    {
        Arc4Gen gen;

        ASSERT_THROW(gen.Generate(out.begin(), out.size()), Chaos::Service::ChaosException);

        ASSERT_THROW(gen.Drop(0), Chaos::Service::ChaosException);
        ASSERT_THROW(gen.Drop(1), Chaos::Service::ChaosException);
        ASSERT_THROW(gen.Drop(20), Chaos::Service::ChaosException);
        ASSERT_THROW(gen.Drop(256), Chaos::Service::ChaosException);
    }

    {
        const char * key = "smal";

        Arc4Gen gen;

        ASSERT_THROW(gen.Rekey(key, key + strlen(key)), Chaos::Service::ChaosException);

        ASSERT_THROW(gen.Generate(out.begin(), out.size()), Chaos::Service::ChaosException);

        ASSERT_THROW(gen.Drop(0), Chaos::Service::ChaosException);
        ASSERT_THROW(gen.Drop(1), Chaos::Service::ChaosException);
        ASSERT_THROW(gen.Drop(20), Chaos::Service::ChaosException);
        ASSERT_THROW(gen.Drop(256), Chaos::Service::ChaosException);
    }
}