#include "vanity.hpp"

static void inline CalculateW (const uint8_t block[64], uint32_t W[64])
{
/*
implementation of orignal
*/
	for (int i = 0; i < 16; i++)
#ifdef _WIN32
		W[i] = htobe32(((uint32_t *)(block))[i]);
#else
		W[i] = be32toh(((uint32_t *)(block))[i]);
#endif

	for (int i = 16; i < 64; i++)
		W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
}

static void inline TransformBlock (uint32_t state[8], const uint32_t W[64])
{
/*
implementation of orignal
*/
	uint32_t S[8];
	memcpy(S, state, 32);

	uint32_t t0, t1;
	RNDr(S, W, 0, 0x428a2f98); RNDr(S, W, 1, 0x71374491); RNDr(S, W, 2, 0xb5c0fbcf); RNDr(S, W, 3, 0xe9b5dba5);
	RNDr(S, W, 4, 0x3956c25b); RNDr(S, W, 5, 0x59f111f1); RNDr(S, W, 6, 0x923f82a4); RNDr(S, W, 7, 0xab1c5ed5);
	RNDr(S, W, 8, 0xd807aa98); RNDr(S, W, 9, 0x12835b01); RNDr(S, W, 10, 0x243185be); RNDr(S, W, 11, 0x550c7dc3);
	RNDr(S, W, 12, 0x72be5d74); RNDr(S, W, 13, 0x80deb1fe); RNDr(S, W, 14, 0x9bdc06a7); RNDr(S, W, 15, 0xc19bf174);
	RNDr(S, W, 16, 0xe49b69c1); RNDr(S, W, 17, 0xefbe4786); RNDr(S, W, 18, 0x0fc19dc6); RNDr(S, W, 19, 0x240ca1cc);
	RNDr(S, W, 20, 0x2de92c6f); RNDr(S, W, 21, 0x4a7484aa); RNDr(S, W, 22, 0x5cb0a9dc); RNDr(S, W, 23, 0x76f988da);
	RNDr(S, W, 24, 0x983e5152); RNDr(S, W, 25, 0xa831c66d); RNDr(S, W, 26, 0xb00327c8); RNDr(S, W, 27, 0xbf597fc7);
	RNDr(S, W, 28, 0xc6e00bf3); RNDr(S, W, 29, 0xd5a79147); RNDr(S, W, 30, 0x06ca6351); RNDr(S, W, 31, 0x14292967);
	RNDr(S, W, 32, 0x27b70a85); RNDr(S, W, 33, 0x2e1b2138); RNDr(S, W, 34, 0x4d2c6dfc); RNDr(S, W, 35, 0x53380d13);
	RNDr(S, W, 36, 0x650a7354); RNDr(S, W, 37, 0x766a0abb); RNDr(S, W, 38, 0x81c2c92e); RNDr(S, W, 39, 0x92722c85);
	RNDr(S, W, 40, 0xa2bfe8a1); RNDr(S, W, 41, 0xa81a664b); RNDr(S, W, 42, 0xc24b8b70); RNDr(S, W, 43, 0xc76c51a3);
	RNDr(S, W, 44, 0xd192e819); RNDr(S, W, 45, 0xd6990624); RNDr(S, W, 46, 0xf40e3585); RNDr(S, W, 47, 0x106aa070);
	RNDr(S, W, 48, 0x19a4c116); RNDr(S, W, 49, 0x1e376c08); RNDr(S, W, 50, 0x2748774c); RNDr(S, W, 51, 0x34b0bcb5);
	RNDr(S, W, 52, 0x391c0cb3); RNDr(S, W, 53, 0x4ed8aa4a); RNDr(S, W, 54, 0x5b9cca4f); RNDr(S, W, 55, 0x682e6ff3);
	RNDr(S, W, 56, 0x748f82ee); RNDr(S, W, 57, 0x78a5636f); RNDr(S, W, 58, 0x84c87814); RNDr(S, W, 59, 0x8cc70208);
	RNDr(S, W, 60, 0x90befffa); RNDr(S, W, 61, 0xa4506ceb); RNDr(S, W, 62, 0xbef9a3f7); RNDr(S, W, 63, 0xc67178f2);

	for (int i = 0; i < 8; i++)	state[i] += S[i];
}

void inline HashNextBlock (uint32_t state[8], const uint8_t * block)
{
/*
implementation of orignal
*/
	uint32_t W[64];
	CalculateW (block, W);
	TransformBlock (state, W);
}

static bool check_prefix(const char * buf)
{
	unsigned short size_str=0;
	while(*buf)
	{
		if(*buf < 48 || (*buf > 57 && *buf < 65) || (*buf > 64 && *buf < 94) || *buf > 125 || size_str > 52)
			return false;
		size_str++;
		buf++;
	}
	return true;
}

static inline size_t ByteStreamToBase32 (const uint8_t * inBuf, size_t len, char * outBuf, size_t outLen)
{
	size_t ret = 0, pos = 1;
	int bits = 8, tmp = inBuf[0];
	while (ret < outLen && (bits > 0 || pos < len))
	{
		if (bits < 5)
		{
			if (pos < len)
			{
				tmp <<= 8;
				tmp |= inBuf[pos] & 0xFF;
				pos++;
				bits += 8;
			}
			else // last byte
			{
				tmp <<= (5 - bits);
				bits = 5;
			}
		}

		bits -= 5;
		int ind = (tmp >> bits) & 0x1F;
		outBuf[ret] = (ind < 26) ? (ind + 'a') : ((ind - 26) + '2');
		ret++;
	}
	outBuf[ret]='\0';
	return ret;
}

static inline bool NotThat(const char * a, const char *b)
{
	while(*b)
		if(*a++!=*b++)
			return true;
	return false;
}

static inline bool thread_find(uint8_t * buf, const char * prefix, int id_thread, unsigned long long throughput)
{
/*
Thanks to orignal ^-^
For idea and example ^-^
Orignal is sensei of crypto ;)
*/
	std::cout << "Thread " << id_thread << " binded" << std::endl;
/*
	union
	{
		uint8_t b[391];
		uint32_t ll;
	} local;
	union
	{
		uint8_t b[32];
		uint32_t ll[8];
	} hash;
*/
	uint8_t b[391];
	uint32_t hash[8];

	memcpy (b, buf, 391);

	auto len = strlen (prefix);
	// precalculate first 5 blocks (320 bytes)
	uint32_t state[8] = { 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 };
	HashNextBlock (state, b);
	HashNextBlock (state, b + 64);
	HashNextBlock (state, b + 128);
	HashNextBlock (state, b + 192);
	HashNextBlock (state, b + 256);

	// pre-calculate last W
	uint32_t lastW[64];
	CalculateW (lastBlock, lastW);

	uint32_t * nonce = (uint32_t *)(b+320);
	(*nonce) += id_thread*throughput;

	char addr[53];
	uint32_t state1[8];

	while(throughput-- and !found)
	{
		memcpy (state1, state, 32);
		// calculate hash of block with nonce
		HashNextBlock (state1, b + 320);
		// apply last block
		TransformBlock (state1, lastW);
		// get final hash
		for (int j = 8; j--;)
			hash[j] = htobe32(state1[j]);
		ByteStreamToBase32 ((uint8_t*)hash, 32, addr, len);
		//	std::cout << addr << std::endl;
		if(!NotThat(addr,prefix))
		{
			ByteStreamToBase32 ((uint8_t*)hash, 32, addr, 52);
			std::cout << "Address found " << addr << " in " << id_thread << std::endl;
			found=true;
			FoundNonce=*nonce;
		//	free(hash);
		//	free(b);
			return true;
		}

		(*nonce)++;
		hashescounter++;
		if (found)
		{
	//		free(hash);
	//		free(b);
			break;
		}
	}//while
	return true;
}

int main (int argc, char * argv[])
{
	if ( argc < 3 )
	{
		std::cout << "Usage: " << argv[0] << " filename generatestring <threads(default of system)> <signature type>" << std::endl;
		return 0;
	}
	if(!check_prefix(argv[2]))
	{
		std::cout << "Not correct prefix" << std::endl;
		return 0;
	}
	i2p::crypto::InitCrypto (false);
	type = i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519;
	if ( argc > 3 )
	{
		unsigned int tmp = atoi(argv[3]);
		if(tmp > 255)
		{
			std::cout << "Really more than 255 threads?:D Nope, sorry" << std::endl;
			return 0;
		}
		count_cpu=atoi(argv[3]);
	}
	if ( argc > 4 )
	{
		type = NameToSigType(std::string(argv[4]));
	}

///////////////
//For while
	if(type != i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519)
	{
		std::cout << "For a while only ED25519-SHA512" << std::endl;
		return 0;
	}
///////////////

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	auto keys = i2p::data::PrivateKeys::CreateRandomKeys (type);
	switch(type)
	{
		case i2p::data::SIGNING_KEY_TYPE_DSA_SHA1:
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA256_2048:
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA384_3072:
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA512_4096:
		case i2p::data::SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512:
		case i2p::data::SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512_TEST:
		std::cout << "Sorry, i don't can generate adress for this signature type" << std::endl;
		return 0;
		break;
	}

//TODO: for other types.
	switch(type)
	{
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256:
		break;
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA384_P384:
		break;
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
		break;
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA256_2048:
		break;
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA384_3072:
		break;
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA512_4096:
		break;
		case i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
			MutateByte=320;
		break;
		case i2p::data::SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256:
		case i2p::data::SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256_TEST:
		break;
	}

	KeyBuf = new uint8_t[keys.GetFullLen()];
	keys.ToBuffer (KeyBuf, keys.GetFullLen ());

	if(!count_cpu)
	{
#if defined(WIN32)
		SYSTEM_INFO siSysInfo;
		GetSystemInfo(&siSysInfo);
		count_cpu = siSysInfo.dwNumberOfProcessors;
#elif defined(_SC_NPROCESSORS_CONF)
		count_cpu = sysconf(_SC_NPROCESSORS_CONF);
#elif defined(HW_NCPU)
		int req[] = { CTL_HW, HW_NCPU };
		size_t len = sizeof(count_cpu);
		v = sysctl(req, 2, &count_cpu, &len, NULL, 0);
#else
		count_cpu = 4;
#endif
	}

	std::cout << "Start vanity generator in " << count_cpu << " threads" << std::endl;

	unsigned short attempts = 0;
	while(!found)
	{//while
		{//stack(for destructors(vector/thread))

			std::vector<std::thread> threads(count_cpu);
			unsigned long long thoughtput = 0x4F4B5A37;

			for ( unsigned int j = count_cpu;j--;)
			{
				threads[j] = std::thread(thread_find,KeyBuf,argv[2],j,thoughtput);
				thoughtput+=1000;
			}//for

			for(unsigned int j = 0; j < count_cpu;j++)
				threads[j].join();

			if(FoundNonce == 0)
			{
				RAND_bytes( KeyBuf+MutateByte , 90 );
				std::cout << "Attempts #" << ++attempts << std::endl;
			}

		}//stack
	}//while

	memcpy (KeyBuf + MutateByte, &FoundNonce, 4);
	std::cout << "Hashes: " << hashescounter << std::endl;

	std::ofstream f (argv[1], std::ofstream::binary | std::ofstream::out);
	if (f)
	{
		f.write ((char *)KeyBuf, keys.GetFullLen ());
		delete [] KeyBuf;
	}
	else
		std::cout << "Can't create file " << argv[1] << std::endl;

	i2p::crypto::TerminateCrypto ();

	return 0;
}