/*
 * Raw-MD5 "flat intrinsics" experimental format
 *
 * This software is Copyright (c) 2011-2015 magnum,
 * and it is hereby released to the general public under the following terms:
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted.
 *
 */

#include "arch.h"

#if USE_EXPERIMENTAL

#if FMT_EXTERNS_H
extern struct fmt_main fmt_rawMD5f;
#elif FMT_REGISTERS_H
john_register_one(&fmt_rawMD5f);
#else

#include <string.h>

#include "md5.h"
#include "common.h"
#include "formats.h"

#if !FAST_FORMATS_OMP
#undef _OPENMP
#endif

#ifdef _OPENMP
#ifdef SIMD_COEF_32
#ifndef OMP_SCALE
#define OMP_SCALE               1024
#endif
#else
#ifndef OMP_SCALE
#define OMP_SCALE               2048
#endif
#endif
#include <omp.h>
#endif
#include "pseudo_intrinsics.h"
#include "sse-intrinsics.h"
#include "memdbg.h"

#ifdef SIMD_COEF_32
#define NBKEYS                  (SIMD_COEF_32 * SIMD_PARA_MD5)
#define PLAINTEXT_LENGTH        55
#define MIN_KEYS_PER_CRYPT      NBKEYS
#define MAX_KEYS_PER_CRYPT      NBKEYS
#else
#define PLAINTEXT_LENGTH        125
#define MIN_KEYS_PER_CRYPT      1
#define MAX_KEYS_PER_CRYPT      1
#endif

#define FORMAT_LABEL            "Raw-MD5-flat"
#define FORMAT_NAME             ""
#define ALGORITHM_NAME          "MD5 " MD5_ALGORITHM_NAME " (experimental)"

#define BENCHMARK_COMMENT       ""
#define BENCHMARK_LENGTH        -1

#define CIPHERTEXT_LENGTH       32

#define DIGEST_SIZE             16
#define BINARY_SIZE             16 // source()
#define BINARY_ALIGN            4
#define SALT_SIZE               0
#define SALT_ALIGN              1

#define FORMAT_TAG              "$dynamic_0$"
#define TAG_LENGTH              (sizeof(FORMAT_TAG) - 1)

static struct fmt_tests tests[] = {
	{"5a105e8b9d40e1329780d62ea2265d8a", "test1"},
	{FORMAT_TAG "5a105e8b9d40e1329780d62ea2265d8a", "test1"},
	{"098f6bcd4621d373cade4e832627b4f6", "test"},
	{FORMAT_TAG "378e2c4a07968da2eca692320136433d", "thatsworking"},
	{FORMAT_TAG "8ad8757baa8564dc136c1e07507f4a98", "test3"},
	{"d41d8cd98f00b204e9800998ecf8427e", ""},
#ifdef DEBUG
#if PLAINTEXT_LENGTH >= 55
	{FORMAT_TAG "c9ccf168914a1bcfc3229f1948e67da0","1234567890123456789012345678901234567890123456789012345"},
#if PLAINTEXT_LENGTH >= 80
	{FORMAT_TAG "57edf4a22be3c955ac49da2e2107b67a","12345678901234567890123456789012345678901234567890123456789012345678901234567890"},
#endif // 80
#endif // 55
#endif // DEBUG
	{NULL}
};

#ifdef SIMD_COEF_32
static ARCH_WORD_32 (*crypt_key)[DIGEST_SIZE/4*NBKEYS];
static ARCH_WORD_32 (*saved_key)[64/4];
static int sz;
#else
static char (*saved_key)[PLAINTEXT_LENGTH + 1];
static ARCH_WORD_32 (*crypt_key)[DIGEST_SIZE/4];
#endif

static void init(struct fmt_main *self)
{
#ifdef _OPENMP
	int omp_t = omp_get_max_threads();
	self->params.min_keys_per_crypt *= omp_t;
	omp_t *= OMP_SCALE;
	self->params.max_keys_per_crypt *= omp_t;
#endif
	sz = self->params.max_keys_per_crypt * 64;
#ifndef SIMD_COEF_32
	saved_key = mem_calloc(self->params.max_keys_per_crypt,
	                       sizeof(*saved_key));
	crypt_key = mem_calloc(self->params.max_keys_per_crypt,
	                       sizeof(*crypt_key));
#else
	saved_key = mem_calloc_align(self->params.max_keys_per_crypt,
	                             sizeof(*saved_key), MEM_ALIGN_SIMD);
	crypt_key = mem_calloc_align(self->params.max_keys_per_crypt/NBKEYS,
	                             sizeof(*crypt_key), MEM_ALIGN_SIMD);
#endif
}

static void done(void)
{
	MEM_FREE(crypt_key);
	MEM_FREE(saved_key);
}

static int valid(char *ciphertext, struct fmt_main *self)
{
	char *p, *q;

	p = ciphertext;
	if (!strncmp(p, FORMAT_TAG, TAG_LENGTH))
		p += TAG_LENGTH;

	q = p;
	while (atoi16[ARCH_INDEX(*q)] != 0x7F) {
		if (*q >= 'A' && *q <= 'F') /* support lowercase only */
			return 0;
		q++;
	}
	return !*q && q - p == CIPHERTEXT_LENGTH;
}

static char *split(char *ciphertext, int index, struct fmt_main *self)
{
	static char out[TAG_LENGTH + CIPHERTEXT_LENGTH + 1];

	if (!strncmp(ciphertext, FORMAT_TAG, TAG_LENGTH))
		return ciphertext;

	memcpy(out, FORMAT_TAG, TAG_LENGTH);
	memcpy(out + TAG_LENGTH, ciphertext, CIPHERTEXT_LENGTH + 1);
	return out;
}

static void *get_binary(char *ciphertext)
{
	static unsigned char *out;
	char *p;
	int i;

	if (!out) out = mem_alloc_tiny(DIGEST_SIZE, MEM_ALIGN_WORD);

	p = ciphertext + TAG_LENGTH;
	for (i = 0; i < DIGEST_SIZE; i++) {
		out[i] =
		    (atoi16[ARCH_INDEX(*p)] << 4) |
		    atoi16[ARCH_INDEX(p[1])];
		p += 2;
	}

	return out;
}

#ifdef SIMD_COEF_32
#define HASH_OFFSET (index&(SIMD_COEF_32-1))+(((unsigned int)index%NBKEYS)/SIMD_COEF_32)*SIMD_COEF_32*4
static int get_hash_0(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0xf; }
static int get_hash_1(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0xff; }
static int get_hash_2(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0xfff; }
static int get_hash_3(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0xffff; }
static int get_hash_4(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0xfffff; }
static int get_hash_5(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0xffffff; }
static int get_hash_6(int index) { return crypt_key[index/NBKEYS][HASH_OFFSET] & 0x7ffffff; }
#else
static int get_hash_0(int index) { return crypt_key[index][0] & 0xf; }
static int get_hash_1(int index) { return crypt_key[index][0] & 0xff; }
static int get_hash_2(int index) { return crypt_key[index][0] & 0xfff; }
static int get_hash_3(int index) { return crypt_key[index][0] & 0xffff; }
static int get_hash_4(int index) { return crypt_key[index][0] & 0xfffff; }
static int get_hash_5(int index) { return crypt_key[index][0] & 0xffffff; }
static int get_hash_6(int index) { return crypt_key[index][0] & 0x7ffffff; }
#endif

static void set_key(char *key, int index)
{
#ifdef SIMD_COEF_32
	int len = strlen(key);
	strncpy((char*)saved_key[index], key, sizeof(saved_key[0]));
	((unsigned char*)saved_key[index])[len] = 0x80;
	saved_key[index][14] = len << 3;
#else
	strcpy(saved_key[index], key);
#endif
}

static char *get_key(int index)
{
#ifdef SIMD_COEF_32
	int len = saved_key[index][14] >> 3;
	((char*)saved_key[index])[len] = 0;
#endif
	return (char*)saved_key[index];
}

static int crypt_all(int *pcount, struct db_salt *salt)
{
	const int count = *pcount;
	int index = 0;
#ifdef _OPENMP
#ifdef SIMD_COEF_32
	const int inc = SIMD_COEF_32;
#else
	const int inc = 1;
#endif
	const int loops = (count + MAX_KEYS_PER_CRYPT - 1) / MAX_KEYS_PER_CRYPT;

#pragma omp parallel for
	for (index = 0; index < loops; index += inc)
#endif
	{
#if SIMD_COEF_32
		SSEmd5body(saved_key[index], crypt_key[index/NBKEYS], NULL, SSEi_FLAT_IN);
#else
		MD5_CTX ctx;
		MD5_Init(&ctx);
		MD5_Update(&ctx, saved_key[index], strlen(saved_key[index]));
		MD5_Final((unsigned char *)crypt_key[index], &ctx);
#endif
	}
	return count;
}

static int cmp_all(void *binary, int count) {
	int index;
	for (index = 0; index < count; index++)
#ifdef SIMD_COEF_32
        if (((ARCH_WORD_32 *) binary)[0] == ((ARCH_WORD_32*)crypt_key)[(index&(SIMD_COEF_32-1)) + (unsigned int)index/SIMD_COEF_32*4*SIMD_COEF_32])
#else
		if ( ((ARCH_WORD_32*)binary)[0] == crypt_key[index][0] )
#endif
			return 1;
	return 0;
}

static int cmp_one(void *binary, int index)
{
#ifdef SIMD_COEF_32
    int i;
	for (i = 0; i < BINARY_SIZE/sizeof(ARCH_WORD_32); i++)
        if (((ARCH_WORD_32 *) binary)[i] != ((ARCH_WORD_32*)crypt_key)[(index&(SIMD_COEF_32-1)) + (unsigned int)index/SIMD_COEF_32*4*SIMD_COEF_32+i*SIMD_COEF_32])
            return 0;
	return 1;
#else
	return !memcmp(binary, crypt_key[index], BINARY_SIZE);
#endif
}

static int cmp_exact(char *source, int index)
{
	return 1;
}

static char *source(char *source, void *binary)
{
	static char Buf[CIPHERTEXT_LENGTH + TAG_LENGTH + 1];
	unsigned char *cpi;
	char *cpo;
	int i;

	strcpy(Buf, FORMAT_TAG);
	cpo = &Buf[TAG_LENGTH];

	cpi = (unsigned char*)(binary);

	for (i = 0; i < BINARY_SIZE; ++i) {
		*cpo++ = itoa16[(*cpi)>>4];
		*cpo++ = itoa16[*cpi&0xF];
		++cpi;
	}
	*cpo = 0;
	return Buf;
}

struct fmt_main fmt_rawMD5f = {
	{
		FORMAT_LABEL,
		FORMAT_NAME,
		ALGORITHM_NAME,
		BENCHMARK_COMMENT,
		BENCHMARK_LENGTH,
		0,
		PLAINTEXT_LENGTH,
		BINARY_SIZE,
		BINARY_ALIGN,
		SALT_SIZE,
		SALT_ALIGN,
		MIN_KEYS_PER_CRYPT,
		MAX_KEYS_PER_CRYPT,
#ifdef _OPENMP
		FMT_OMP | FMT_OMP_BAD |
#endif
		FMT_CASE | FMT_8_BIT,
#if FMT_MAIN_VERSION > 11
		{ NULL },
#endif
		tests
	}, {
		init,
		done,
		fmt_default_reset,
		fmt_default_prepare,
		valid,
		split,
		get_binary,
		fmt_default_salt,
#if FMT_MAIN_VERSION > 11
		{ NULL },
#endif
		source,
		{
			fmt_default_binary_hash_0,
			fmt_default_binary_hash_1,
			fmt_default_binary_hash_2,
			fmt_default_binary_hash_3,
			fmt_default_binary_hash_4,
			fmt_default_binary_hash_5,
			fmt_default_binary_hash_6
		},
		fmt_default_salt_hash,
		NULL,
		fmt_default_set_salt,
		set_key,
		get_key,
		fmt_default_clear_keys,
		crypt_all,
		{
			get_hash_0,
			get_hash_1,
			get_hash_2,
			get_hash_3,
			get_hash_4,
			get_hash_5,
			get_hash_6
		},
		cmp_all,
		cmp_one,
		cmp_exact
	}
};

#endif /* plugin stanza */

#endif /* USE_EXPERIMENTAL */
