// Copyright (c) 2012-2013 The Cryptonote developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "crypto/oaes_lib.h"
#include "crypto/c_keccak.h"
#include "crypto/c_groestl.h"
#include "crypto/c_blake256.h"
#include "crypto/c_jh.h"
#include "crypto/c_skein.h"
#include "crypto/int-util.h"
#include "crypto/hash-ops.h"
#include <x86intrin.h>
#include <wmmintrin.h>
#include <sys/mman.h>

#include <wmmintrin.h>
#include <sys/mman.h>

#define MEMORY         (1 << 21) /* 2 MiB */
#define ITER           (1 << 20)
#define AES_BLOCK_SIZE  16
#define AES_KEY_SIZE    32 /*16*/
#define INIT_SIZE_BLK   8
#define INIT_SIZE_BYTE (INIT_SIZE_BLK * AES_BLOCK_SIZE)

///////////////////////////////
#undef unlikely
#undef likely
#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#define unlikely(expr) (__builtin_expect(!!(expr), 0))
#define likely(expr) (__builtin_expect(!!(expr), 1))
#else
#define unlikely(expr) (expr)
#define likely(expr) (expr)
#endif
///////////////////////////////

#pragma pack(push, 1)
union cn_slow_hash_state {
    union hash_state hs;
    struct {
        uint8_t k[64];
        uint8_t init[INIT_SIZE_BYTE];
    };
};
#pragma pack(pop)

static void do_blake_hash(const void* input, size_t len, char* output) {
    blake256_hash((uint8_t*)output, input, len);
}

void do_groestl_hash(const void* input, size_t len, char* output) {
    groestl(input, len * 8, (uint8_t*)output);
}

static void do_jh_hash(const void* input, size_t len, char* output) {
    int r = jh_hash_n(HASH_SIZE * 8, input, 8 * len, (uint8_t*)output);
    assert(SUCCESS == r);
}

static void do_skein_hash(const void* input, size_t len, char* output) {
    int r = c_skein_hash(8 * HASH_SIZE, input, 8 * len, (uint8_t*)output);
    assert(SKEIN_SUCCESS == r);
}

static void (* const extra_hashes[4])(const void *, size_t, char *) = {
    do_blake_hash, do_groestl_hash, do_jh_hash, do_skein_hash
};

extern int aesb_single_round(const uint8_t *in, uint8_t*out, const uint8_t *expandedKey);
extern int aesb_pseudo_round(const uint8_t *in, uint8_t *out, const uint8_t *expandedKey);

static inline size_t e2i(const uint8_t* a) {
    return (*((uint64_t*) a) / AES_BLOCK_SIZE) & (MEMORY / AES_BLOCK_SIZE - 1);
}

static inline void copy_block(uint8_t* dst, const uint8_t* src) {
    ((uint64_t*) dst)[0] = ((uint64_t*) src)[0];
    ((uint64_t*) dst)[1] = ((uint64_t*) src)[1];
}

static inline void xor_blocks(uint8_t* a, const uint8_t* b) {
    ((uint64_t*) a)[0] ^= ((uint64_t*) b)[0];
    ((uint64_t*) a)[1] ^= ((uint64_t*) b)[1];
}

static inline void xor_blocks_dst(const uint8_t* a, const uint8_t* b, uint8_t* dst) {
    ((uint64_t*) dst)[0] = ((uint64_t*) a)[0] ^ ((uint64_t*) b)[0];
    ((uint64_t*) dst)[1] = ((uint64_t*) a)[1] ^ ((uint64_t*) b)[1];
}

////////////////
struct cryptonight_ctx {
    uint8_t long_state[MEMORY] __attribute((aligned(16)));
    union cn_slow_hash_state state;
    uint8_t text[INIT_SIZE_BYTE] __attribute((aligned(16)));
    uint64_t a[AES_BLOCK_SIZE >> 3] __attribute((aligned(16)));
    uint64_t b[AES_BLOCK_SIZE >> 3] __attribute((aligned(16)));
    uint8_t c[AES_BLOCK_SIZE];
    uint8_t aes_key[AES_KEY_SIZE];
    oaes_ctx* aes_ctx;
};

#pragma GCC target "aes"

static inline void ExpandAESKey256_sub1(__m128i *tmp1, __m128i *tmp2)
{
	__m128i tmp4;
	*tmp2 = _mm_shuffle_epi32(*tmp2, 0xFF);
	tmp4 = _mm_slli_si128(*tmp1, 0x04);
	*tmp1 = _mm_xor_si128(*tmp1, tmp4);
	tmp4 = _mm_slli_si128(tmp4, 0x04);
	*tmp1 = _mm_xor_si128(*tmp1, tmp4);
	tmp4 = _mm_slli_si128(tmp4, 0x04);
	*tmp1 = _mm_xor_si128(*tmp1, tmp4);
	*tmp1 = _mm_xor_si128(*tmp1, *tmp2);
}

static inline void ExpandAESKey256_sub2(__m128i *tmp1, __m128i *tmp3)
{
	__m128i tmp2, tmp4;
	
	tmp4 = _mm_aeskeygenassist_si128(*tmp1, 0x00);
	tmp2 = _mm_shuffle_epi32(tmp4, 0xAA);
	tmp4 = _mm_slli_si128(*tmp3, 0x04);
	*tmp3 = _mm_xor_si128(*tmp3, tmp4);
	tmp4 = _mm_slli_si128(tmp4, 0x04);
	*tmp3 = _mm_xor_si128(*tmp3, tmp4);
	tmp4 = _mm_slli_si128(tmp4, 0x04);
	*tmp3 = _mm_xor_si128(*tmp3, tmp4);
	*tmp3 = _mm_xor_si128(*tmp3, tmp2);
}

// Special thanks to Intel for helping me
// with ExpandAESKey256() and its subroutines
static inline void ExpandAESKey256(char *keybuf)
{
	__m128i tmp1, tmp2, tmp3, *keys;
	
	keys = (__m128i *)keybuf;
	
	tmp1 = _mm_load_si128((__m128i *)keybuf);
	tmp3 = _mm_load_si128((__m128i *)(keybuf+0x10));
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x01);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[2] = tmp1;
	ExpandAESKey256_sub2(&tmp1, &tmp3);
	keys[3] = tmp3;
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x02);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[4] = tmp1;
	ExpandAESKey256_sub2(&tmp1, &tmp3);
	keys[5] = tmp3;
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x04);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[6] = tmp1;
	ExpandAESKey256_sub2(&tmp1, &tmp3);
	keys[7] = tmp3;
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x08);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[8] = tmp1;
	ExpandAESKey256_sub2(&tmp1, &tmp3);
	keys[9] = tmp3;
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x10);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[10] = tmp1;
	ExpandAESKey256_sub2(&tmp1, &tmp3);
	keys[11] = tmp3;
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x20);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[12] = tmp1;
	ExpandAESKey256_sub2(&tmp1, &tmp3);
	keys[13] = tmp3;
	
	tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x40);
	ExpandAESKey256_sub1(&tmp1, &tmp2);
	keys[14] = tmp1;
}

void cryptonight_hash(const char *input, char *output, uint32_t len)
{
	struct cryptonight_ctx *ctx = (struct cryptonight_ctx *)mmap(0, sizeof(struct cryptonight_ctx), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, 0, 0);
	if(ctx == MAP_FAILED) ctx = (struct cryptonight_ctx *)malloc(sizeof(struct cryptonight_ctx));
	madvise(ctx, sizeof(struct cryptonight_ctx), MADV_RANDOM | MADV_WILLNEED | MADV_HUGEPAGE);
	
    hash_process(&ctx->state.hs, (const uint8_t*) input, len);
    uint8_t ExpandedKey[256];
    size_t i, j;
    
    memcpy(ctx->text, ctx->state.init, INIT_SIZE_BYTE);
    memcpy(ExpandedKey, ctx->state.hs.b, AES_KEY_SIZE);
    ExpandAESKey256(ExpandedKey);
    
    __m128i *longoutput, *expkey, *xmminput;
	longoutput = (__m128i *)ctx->long_state;
	expkey = (__m128i *)ExpandedKey;
	xmminput = (__m128i *)ctx->text;
    
    //for (i = 0; likely(i < MEMORY); i += INIT_SIZE_BYTE)
    //    aesni_parallel_noxor(&ctx->long_state[i], ctx->text, ExpandedKey);
    
    for (i = 0; __builtin_expect(i < MEMORY, 1); i += INIT_SIZE_BYTE)
    {
		for(j = 0; j < 10; j++)
		{
			xmminput[0] = _mm_aesenc_si128(xmminput[0], expkey[j]);
			xmminput[1] = _mm_aesenc_si128(xmminput[1], expkey[j]);
			xmminput[2] = _mm_aesenc_si128(xmminput[2], expkey[j]);
			xmminput[3] = _mm_aesenc_si128(xmminput[3], expkey[j]);
			xmminput[4] = _mm_aesenc_si128(xmminput[4], expkey[j]);
			xmminput[5] = _mm_aesenc_si128(xmminput[5], expkey[j]);
			xmminput[6] = _mm_aesenc_si128(xmminput[6], expkey[j]);
			xmminput[7] = _mm_aesenc_si128(xmminput[7], expkey[j]);
		}
		_mm_store_si128(&(longoutput[(i >> 4)]), xmminput[0]);
		_mm_store_si128(&(longoutput[(i >> 4) + 1]), xmminput[1]);
		_mm_store_si128(&(longoutput[(i >> 4) + 2]), xmminput[2]);
		_mm_store_si128(&(longoutput[(i >> 4) + 3]), xmminput[3]);
		_mm_store_si128(&(longoutput[(i >> 4) + 4]), xmminput[4]);
		_mm_store_si128(&(longoutput[(i >> 4) + 5]), xmminput[5]);
		_mm_store_si128(&(longoutput[(i >> 4) + 6]), xmminput[6]);
		_mm_store_si128(&(longoutput[(i >> 4) + 7]), xmminput[7]);
    }
	
	for (i = 0; i < 2; i++) 
    {
	    ctx->a[i] = ((uint64_t *)ctx->state.k)[i] ^  ((uint64_t *)ctx->state.k)[i+4];
	    ctx->b[i] = ((uint64_t *)ctx->state.k)[i+2] ^  ((uint64_t *)ctx->state.k)[i+6];
    }

	__m128i b_x = _mm_load_si128((__m128i *)ctx->b);
    uint64_t a[2] __attribute((aligned(16))), b[2] __attribute((aligned(16)));
    a[0] = ctx->a[0];
    a[1] = ctx->a[1];
	
	for(i = 0; __builtin_expect(i < 0x80000, 1); i++)
	{	  
	__m128i c_x = _mm_load_si128((__m128i *)&ctx->long_state[a[0] & 0x1FFFF0]);
	__m128i a_x = _mm_load_si128((__m128i *)a);
	uint64_t c[2];
	c_x = _mm_aesenc_si128(c_x, a_x);

	_mm_store_si128((__m128i *)c, c_x);
	__builtin_prefetch(&ctx->long_state[c[0] & 0x1FFFF0], 0, 1);
	
	b_x = _mm_xor_si128(b_x, c_x);
	_mm_store_si128((__m128i *)&ctx->long_state[a[0] & 0x1FFFF0], b_x);

	uint64_t *nextblock = (uint64_t *)&ctx->long_state[c[0] & 0x1FFFF0];
	uint64_t b[2];
	b[0] = nextblock[0];
	b[1] = nextblock[1];

	{
	  uint64_t hi, lo;
	 // hi,lo = 64bit x 64bit multiply of c[0] and b[0]

	  __asm__("mulq %3\n\t"
		  : "=d" (hi),
		"=a" (lo)
		  : "%a" (c[0]),
		"rm" (b[0])
		  : "cc" );
	  
	  a[0] += hi;
	  a[1] += lo;
	}
	uint64_t *dst = &ctx->long_state[c[0] & 0x1FFFF0];
	dst[0] = a[0];
	dst[1] = a[1];

	a[0] ^= b[0];
	a[1] ^= b[1];
	b_x = c_x;
	__builtin_prefetch(&ctx->long_state[a[0] & 0x1FFFF0], 0, 3);
	}

    memcpy(ctx->text, ctx->state.init, INIT_SIZE_BYTE);
    memcpy(ExpandedKey, &ctx->state.hs.b[32], AES_KEY_SIZE);
    ExpandAESKey256(ExpandedKey);
    
    //for (i = 0; likely(i < MEMORY); i += INIT_SIZE_BYTE)
    //    aesni_parallel_xor(&ctx->text, ExpandedKey, &ctx->long_state[i]);
    
    for (i = 0; __builtin_expect(i < MEMORY, 1); i += INIT_SIZE_BYTE) 
	{	
		xmminput[0] = _mm_xor_si128(longoutput[(i >> 4)], xmminput[0]);
		xmminput[1] = _mm_xor_si128(longoutput[(i >> 4) + 1], xmminput[1]);
		xmminput[2] = _mm_xor_si128(longoutput[(i >> 4) + 2], xmminput[2]);
		xmminput[3] = _mm_xor_si128(longoutput[(i >> 4) + 3], xmminput[3]);
		xmminput[4] = _mm_xor_si128(longoutput[(i >> 4) + 4], xmminput[4]);
		xmminput[5] = _mm_xor_si128(longoutput[(i >> 4) + 5], xmminput[5]);
		xmminput[6] = _mm_xor_si128(longoutput[(i >> 4) + 6], xmminput[6]);
		xmminput[7] = _mm_xor_si128(longoutput[(i >> 4) + 7], xmminput[7]);
		
		for(j = 0; j < 10; j++)
		{
			xmminput[0] = _mm_aesenc_si128(xmminput[0], expkey[j]);
			xmminput[1] = _mm_aesenc_si128(xmminput[1], expkey[j]);
			xmminput[2] = _mm_aesenc_si128(xmminput[2], expkey[j]);
			xmminput[3] = _mm_aesenc_si128(xmminput[3], expkey[j]);
			xmminput[4] = _mm_aesenc_si128(xmminput[4], expkey[j]);
			xmminput[5] = _mm_aesenc_si128(xmminput[5], expkey[j]);
			xmminput[6] = _mm_aesenc_si128(xmminput[6], expkey[j]);
			xmminput[7] = _mm_aesenc_si128(xmminput[7], expkey[j]);
		}
		
	}
        
    memcpy(ctx->state.init, ctx->text, INIT_SIZE_BYTE);
    hash_permutation(&ctx->state.hs);
    extra_hashes[ctx->state.hs.b[0] & 3](&ctx->state, 200, output);
    munmap(ctx, sizeof(struct cryptonight_ctx));
}


void cryptonight_fast_hash(const char* input, char* output, uint32_t len) {
    union hash_state state;
    hash_process(&state, (const uint8_t*) input, len);
    memcpy(output, &state, HASH_SIZE);
}