#pragma once

#include <stddef.h>
#include <switch.h>

namespace Crypto
{
#define RSA_2048_BYTES 0x100
#define RSA_2048_BITS (RSA_2048_BYTES*8)
	static const unsigned char NCAHeaderSignature[0x100] = { /* Fixed RSA key used to validate NCA signature 0. */
		0xBF, 0xBE, 0x40, 0x6C, 0xF4, 0xA7, 0x80, 0xE9, 0xF0, 0x7D, 0x0C, 0x99, 0x61, 0x1D, 0x77, 0x2F,
		0x96, 0xBC, 0x4B, 0x9E, 0x58, 0x38, 0x1B, 0x03, 0xAB, 0xB1, 0x75, 0x49, 0x9F, 0x2B, 0x4D, 0x58,
		0x34, 0xB0, 0x05, 0xA3, 0x75, 0x22, 0xBE, 0x1A, 0x3F, 0x03, 0x73, 0xAC, 0x70, 0x68, 0xD1, 0x16,
		0xB9, 0x04, 0x46, 0x5E, 0xB7, 0x07, 0x91, 0x2F, 0x07, 0x8B, 0x26, 0xDE, 0xF6, 0x00, 0x07, 0xB2,
		0xB4, 0x51, 0xF8, 0x0D, 0x0A, 0x5E, 0x58, 0xAD, 0xEB, 0xBC, 0x9A, 0xD6, 0x49, 0xB9, 0x64, 0xEF,
		0xA7, 0x82, 0xB5, 0xCF, 0x6D, 0x70, 0x13, 0xB0, 0x0F, 0x85, 0xF6, 0xA9, 0x08, 0xAA, 0x4D, 0x67,
		0x66, 0x87, 0xFA, 0x89, 0xFF, 0x75, 0x90, 0x18, 0x1E, 0x6B, 0x3D, 0xE9, 0x8A, 0x68, 0xC9, 0x26,
		0x04, 0xD9, 0x80, 0xCE, 0x3F, 0x5E, 0x92, 0xCE, 0x01, 0xFF, 0x06, 0x3B, 0xF2, 0xC1, 0xA9, 0x0C,
		0xCE, 0x02, 0x6F, 0x16, 0xBC, 0x92, 0x42, 0x0A, 0x41, 0x64, 0xCD, 0x52, 0xB6, 0x34, 0x4D, 0xAE,
		0xC0, 0x2E, 0xDE, 0xA4, 0xDF, 0x27, 0x68, 0x3C, 0xC1, 0xA0, 0x60, 0xAD, 0x43, 0xF3, 0xFC, 0x86,
		0xC1, 0x3E, 0x6C, 0x46, 0xF7, 0x7C, 0x29, 0x9F, 0xFA, 0xFD, 0xF0, 0xE3, 0xCE, 0x64, 0xE7, 0x35,
		0xF2, 0xF6, 0x56, 0x56, 0x6F, 0x6D, 0xF1, 0xE2, 0x42, 0xB0, 0x83, 0x40, 0xA5, 0xC3, 0x20, 0x2B,
		0xCC, 0x9A, 0xAE, 0xCA, 0xED, 0x4D, 0x70, 0x30, 0xA8, 0x70, 0x1C, 0x70, 0xFD, 0x13, 0x63, 0x29,
		0x02, 0x79, 0xEA, 0xD2, 0xA7, 0xAF, 0x35, 0x28, 0x32, 0x1C, 0x7B, 0xE6, 0x2F, 0x1A, 0xAA, 0x40,
		0x7E, 0x32, 0x8C, 0x27, 0x42, 0xFE, 0x82, 0x78, 0xEC, 0x0D, 0xEB, 0xE6, 0x83, 0x4B, 0x6D, 0x81,
		0x04, 0x40, 0x1A, 0x9E, 0x9A, 0x67, 0xF6, 0x72, 0x29, 0xFA, 0x04, 0xF0, 0x9D, 0xE4, 0xF4, 0x03
	};

	class Keys
	{
	public:
		Keys()
		{
			u8 kek[0x10] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

			splCryptoGenerateAesKek(headerKekSource, 0, 0, kek);
			splCryptoGenerateAesKey(kek, headerKeySource, headerKey);
			splCryptoGenerateAesKey(kek, headerKeySource + 0x10, headerKey + 0x10);
		}

		u8 headerKekSource[0x10] = { 0x1F, 0x12, 0x91, 0x3A, 0x4A, 0xCB, 0xF0, 0x0D, 0x4C, 0xDE, 0x3A, 0xF6, 0xD5, 0x23, 0x88, 0x2A };
		u8 headerKeySource[0x20] = { 0x5A, 0x3E, 0xD8, 0x4F, 0xDE, 0xC0, 0xD8, 0x26, 0x31, 0xF7, 0xE2, 0x5D, 0x19, 0x7B, 0xF5, 0xD0, 0x1C, 0x9B, 0x7B, 0xFA, 0xF6, 0x28, 0x18, 0x3D, 0x71, 0xF6, 0x4D, 0x73, 0xF1, 0x50, 0xB9, 0xD2 };

		//u8 headerKey[0x20] = { 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 };
		u8 headerKey[0x20] = { 0xAE, 0xAA, 0xB1, 0xCA, 0x08, 0xAD, 0xF9, 0xBE, 0xF1, 0x29, 0x91, 0xF3, 0x69, 0xE3, 0xC5, 0x67, 0xD6, 0x88, 0x1E, 0x4E, 0x4A, 0x6A, 0x47, 0xA5, 0x1F, 0x6E, 0x48, 0x77, 0x06, 0x2D, 0x54, 0x2D };
	};

	void calculateMGF1andXOR(unsigned char* data, size_t data_size, const void* source, size_t source_size);
	bool rsa2048PssVerify(const void* data, size_t len, const unsigned char* signature, const unsigned char* modulus);

	template<class T>
	T swapEndian(T s)
	{
		T result;
		u8* dest = (u8*)&result;
		u8* src = (u8*)&s;
		for (unsigned int i = 0; i < sizeof(s); i++)
		{
			dest[i] = src[sizeof(s) - i - 1];
		}
		return result;
	}
	class AesCtr
	{
	public:
		AesCtr() : m_high(0), m_low(0)
		{
		}

		AesCtr(u64 iv) : m_high(swapEndian(iv)), m_low(0)
		{
		}

		u64& high() { return m_high; }
		u64& low() { return m_low; }
	private:
		u64 m_high;
		u64 m_low;
	};


	class Aes128Ctr
	{
	public:
		Aes128Ctr(const u8* key, const AesCtr& iv)
		{
			counter = iv;
			aes128CtrContextCreate(&ctx, key, &iv);
			seek(0);
		}

		virtual ~Aes128Ctr()
		{
		}

		void seek(u64 offset)
		{
			counter.low() = swapEndian(offset >> 4);
			aes128CtrContextResetCtr(&ctx, &counter);
		}

		void encrypt(void* dst, const void* src, size_t l)
		{
			aes128CtrCrypt(&ctx, dst, src, l);
		}

		void decrypt(void* dst, const void* src, size_t l)
		{
			encrypt(dst, src, l);
		}
	protected:
		AesCtr counter;

		Aes128CtrContext ctx;
	};

	class AesXtr
	{
	public:
		AesXtr(const u8* key, bool is_encryptor)
		{
			aes128XtsContextCreate(&ctx, key, key + 0x10, is_encryptor);
		}

		virtual ~AesXtr()
		{
		}

		void encrypt(void* dst, const void* src, size_t l, size_t sector, size_t sector_size)
		{
			for (size_t i = 0; i < l; i += sector_size)
			{
				aes128XtsContextResetSector(&ctx, sector++, true);
				aes128XtsEncrypt(&ctx, dst, src, sector_size);

				dst = (u8*)dst + sector_size;
				src = (const u8*)src + sector_size;
			}
		}

		void decrypt(void* dst, const void* src, size_t l, size_t sector, size_t sector_size)
		{
			for (size_t i = 0; i < l; i += sector_size)
			{
				aes128XtsContextResetSector(&ctx, sector++, true);
				aes128XtsDecrypt(&ctx, dst, src, sector_size);

				dst = (u8*)dst + sector_size;
				src = (const u8*)src + sector_size;
			}
		}
	protected:
		Aes128XtsContext ctx;
	};
}