/**
 * Author......: See docs/credits.txt
 * License.....: MIT
 */

#include "common.h"
#include "types.h"
#include "modules.h"
#include "bitops.h"
#include "convert.h"
#include "shared.h"
#include "memory.h"
#include "cpu_crc32.h"
#include "keyboard_layout.h"

static const u32   ATTACK_EXEC    = ATTACK_EXEC_OUTSIDE_KERNEL;
static const u32   DGST_POS0      = 0;
static const u32   DGST_POS1      = 1;
static const u32   DGST_POS2      = 2;
static const u32   DGST_POS3      = 3;
static const u32   DGST_SIZE      = DGST_SIZE_4_32;
static const u32   HASH_CATEGORY  = HASH_CATEGORY_FDE;
static const char *HASH_NAME      = "VeraCrypt SHA256 + XTS 512 bit";
static const u64   KERN_TYPE      = 13751; // old kernel used here
static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE
                                  | OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
static const u64   OPTS_TYPE      = OPTS_TYPE_STOCK_MODULE
                                  | OPTS_TYPE_PT_GENERATE_LE
                                  | OPTS_TYPE_LOOP_EXTENDED
                                  | OPTS_TYPE_MP_MULTI_DISABLE
                                  | OPTS_TYPE_COPY_TMPS;
static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
static const char *ST_PASS        = "hashcat";
static const char *ST_HASH        = "$veracrypt$b8a19a544414e540172595aef79e6616f504799b40a407edfb69d40534e93f0bdb3187876f0b7a21739b3a9bb02bd4752eac4d2021e65a2a9413cc389964fad4$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";

u32         module_attack_exec    (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ATTACK_EXEC;     }
u32         module_dgst_pos0      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS0;       }
u32         module_dgst_pos1      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS1;       }
u32         module_dgst_pos2      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS2;       }
u32         module_dgst_pos3      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS3;       }
u32         module_dgst_size      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_SIZE;       }
u32         module_hash_category  (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_CATEGORY;   }
const char *module_hash_name      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_NAME;       }
u64         module_kern_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return KERN_TYPE;       }
u32         module_opti_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTI_TYPE;       }
u64         module_opts_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTS_TYPE;       }
u32         module_salt_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return SALT_TYPE;       }
const char *module_st_hash        (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_HASH;         }
const char *module_st_pass        (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_PASS;         }

#define VC_SALT_LEN 64
#define VC_DATA_LEN 448

typedef struct vc_tmp
{
  u32 ipad[16];
  u32 opad[16];

  u32 dgst[64];
  u32 out[64];

  u32 pim_key[64];
  int pim; // marker for cracked
  int pim_check; // marker for _extended kernel

} vc_tmp_t;

typedef struct vc
{
  u32 data_buf[112];
  u32 keyfile_buf16[16];
  u32 keyfile_buf32[32];
  u32 keyfile_enabled;
  u32 signature;

  keyboard_layout_mapping_t keyboard_layout_mapping_buf[256];
  int                       keyboard_layout_mapping_cnt;

  int pim_multi; // 2048 for boot (not SHA-512 or Whirlpool), 1000 for others
  int pim_start;
  int pim_stop;

} vc_t;

static const int   ROUNDS_VERACRYPT_500000     = 500000;
static const float MIN_SUFFICIENT_ENTROPY_FILE = 7.0f;
static const char *SIGNATURE_VERACRYPT         = "$veracrypt$";

bool module_unstable_warning (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra, MAYBE_UNUSED const hc_device_param_t *device_param)
{
  // AMD Radeon Pro W5700X Compute Engine; 1.2 (Apr 22 2021 21:54:44); 11.3.1; 20E241
  if ((device_param->opencl_platform_vendor_id == VENDOR_ID_APPLE) && (device_param->opencl_device_type & CL_DEVICE_TYPE_GPU))
  {
    if (device_param->is_metal == false)
    {
      return true;
    }
  }

  return false;
}

char *module_jit_build_options (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra, MAYBE_UNUSED const hashes_t *hashes, MAYBE_UNUSED const hc_device_param_t *device_param)
{
  char *jit_build_options = NULL;

  // Extra treatment for Apple systems
  if (device_param->opencl_platform_vendor_id == VENDOR_ID_APPLE)
  {
    return jit_build_options;
  }

  // NVIDIA GPU
  if (device_param->opencl_device_vendor_id == VENDOR_ID_NV)
  {
    hc_asprintf (&jit_build_options, "-D _unroll");
  }

  return jit_build_options;
}

int module_build_plain_postprocess (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const hashes_t *hashes, MAYBE_UNUSED const void *tmps, const u32 *src_buf, MAYBE_UNUSED const size_t src_sz, MAYBE_UNUSED const int src_len, u32 *dst_buf, MAYBE_UNUSED const size_t dst_sz)
{
  const vc_tmp_t *vc_tmp = (const vc_tmp_t *) tmps;

  if (vc_tmp->pim == 0)
  {
    return snprintf ((char *) dst_buf, dst_sz, "%s", (char *) src_buf);
  }
  else
  {
    return snprintf ((char *) dst_buf, dst_sz, "%s   (PIM=%d)", (char *) src_buf, vc_tmp->pim - 15);
  }
}

u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
  const u64 esalt_size = (const u64) sizeof (vc_t);

  return esalt_size;
}

u64 module_tmp_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
  const u64 tmp_size = (const u64) sizeof (vc_tmp_t);

  return tmp_size;
}

u32 module_kernel_loops_max (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
  const u32 kernel_loops_max = 1000; // lowest PIM multiplier

  return kernel_loops_max;
}

u32 module_pw_max (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
  // this overrides the reductions of PW_MAX in case optimized kernel is selected
  // IOW, even in optimized kernel mode it support length 64

  const u32 pw_max = 128;

  return pw_max;
}

int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED void *digest_buf, MAYBE_UNUSED salt_t *salt, MAYBE_UNUSED void *esalt_buf, MAYBE_UNUSED void *hook_salt_buf, MAYBE_UNUSED hashinfo_t *hash_info, const char *line_buf, MAYBE_UNUSED const int line_len)
{
  u32 *digest = (u32 *) digest_buf;

  vc_t *vc = (vc_t *) esalt_buf;

  hc_token_t token;

  token.token_cnt  = 3;

  token.signatures_cnt    = 1;
  token.signatures_buf[0] = SIGNATURE_VERACRYPT;

  token.len[0]     = 11;
  token.attr[0]    = TOKEN_ATTR_FIXED_LENGTH
                   | TOKEN_ATTR_VERIFY_SIGNATURE;

  token.sep[1]     = '$';
  token.len_min[1] = 128;
  token.len_max[1] = 128;
  token.attr[1]    = TOKEN_ATTR_VERIFY_LENGTH
                   | TOKEN_ATTR_VERIFY_HEX;

  token.sep[2]     = '$';
  token.len_min[2] = 896;
  token.len_max[2] = 896;
  token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH
                   | TOKEN_ATTR_VERIFY_HEX;

  const int rc_tokenizer = input_tokenizer ((const u8 *) line_buf, line_len, &token);

  if (rc_tokenizer != PARSER_OK) return (rc_tokenizer);

  // salt

  const u8 *salt_pos = token.buf[1];

  for (u32 i = 0, j = 0; i < VC_SALT_LEN / 4; i += 1, j += 8)
  {
    salt->salt_buf[i] = hex_to_u32 (salt_pos + j);
  }

  salt->salt_len = VC_SALT_LEN;

  // iter

  salt->salt_iter = ROUNDS_VERACRYPT_500000 - 1;

  // data

  const u8 *data_pos = token.buf[2];

  for (u32 i = 0, j = 0; i < VC_DATA_LEN / 4; i += 1, j += 8)
  {
    vc->data_buf[i] = hex_to_u32 (data_pos + j);
  }

  // entropy

  const float entropy = get_entropy ((const u8 *) vc->data_buf, VC_DATA_LEN);

  if (entropy < MIN_SUFFICIENT_ENTROPY_FILE) return (PARSER_INSUFFICIENT_ENTROPY);

  // pim

  vc->pim_multi = 1000;
  vc->pim_start = 0;
  vc->pim_stop  = 0;

  // signature

  vc->signature = 0x41524556; // "VERA"

  // fake digest

  memcpy (digest, vc->data_buf, 112);

  return (PARSER_OK);
}

int module_hash_decode_postprocess (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED void *digest_buf, MAYBE_UNUSED salt_t *salt, MAYBE_UNUSED void *esalt_buf, MAYBE_UNUSED void *hook_salt_buf, MAYBE_UNUSED hashinfo_t *hash_info, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
  vc_t *vc = (vc_t *) esalt_buf;

  // keyfiles

  if (user_options->veracrypt_keyfiles)
  {
    char *keyfiles = hcstrdup (user_options->veracrypt_keyfiles);

    char *saveptr = NULL;

    char *keyfile = strtok_r (keyfiles, ",", &saveptr);

    while (keyfile)
    {
      if (hc_path_read (keyfile))
      {
        cpu_crc32 (keyfile, (u8 *) vc->keyfile_buf16,  64);
        cpu_crc32 (keyfile, (u8 *) vc->keyfile_buf32, 128);
      }

      keyfile = strtok_r ((char *) NULL, ",", &saveptr);
    }

    hcfree (keyfiles);

    vc->keyfile_enabled = 1;
  }

  // keyboard layout mapping

  if (user_options->keyboard_layout_mapping)
  {
    if (hc_path_read (user_options->keyboard_layout_mapping))
    {
      initialize_keyboard_layout_mapping (user_options->keyboard_layout_mapping, vc->keyboard_layout_mapping_buf, &vc->keyboard_layout_mapping_cnt);
    }
  }

  // veracrypt PIM

  if ((user_options->veracrypt_pim_start_chgd == true) && (user_options->veracrypt_pim_stop_chgd == true))
  {
    vc->pim_start = 15 + user_options->veracrypt_pim_start;
    vc->pim_stop  = 15 + user_options->veracrypt_pim_stop;

    salt->salt_iter = vc->pim_stop * 1000 - 1;
  }

  return (PARSER_OK);
}

int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const void *digest_buf, MAYBE_UNUSED const salt_t *salt, MAYBE_UNUSED const void *esalt_buf, MAYBE_UNUSED const void *hook_salt_buf, MAYBE_UNUSED const hashinfo_t *hash_info, char *line_buf, MAYBE_UNUSED const int line_size)
{
  vc_t *vc = (vc_t *) esalt_buf;

  // salt

  #define SALT_HEX_LEN VC_SALT_LEN * 2 + 1

  char salt_buf[SALT_HEX_LEN] = { 0 };

  for (u32 i = 0, j = 0; i < VC_SALT_LEN / 4; i += 1, j += 8)
  {
    snprintf (salt_buf + j, SALT_HEX_LEN - j, "%08x", byte_swap_32 (salt->salt_buf[i]));
  }

  // data

  #define DATA_HEX_LEN VC_DATA_LEN * 2 + 1

  char data_buf[DATA_HEX_LEN] = { 0 };

  for (u32 i = 0, j = 0; i < VC_DATA_LEN / 4; i += 1, j += 8)
  {
    snprintf (data_buf + j, DATA_HEX_LEN - j, "%08x", byte_swap_32 (vc->data_buf[i]));
  }

  // output

  int line_len = snprintf (line_buf, line_size, "%s%s$%s",
    SIGNATURE_VERACRYPT,
    salt_buf,
    data_buf);

  return line_len;
}

void module_init (module_ctx_t *module_ctx)
{
  module_ctx->module_context_size             = MODULE_CONTEXT_SIZE_CURRENT;
  module_ctx->module_interface_version        = MODULE_INTERFACE_VERSION_CURRENT;

  module_ctx->module_attack_exec              = module_attack_exec;
  module_ctx->module_benchmark_esalt          = MODULE_DEFAULT;
  module_ctx->module_benchmark_hook_salt      = MODULE_DEFAULT;
  module_ctx->module_benchmark_mask           = MODULE_DEFAULT;
  module_ctx->module_benchmark_charset        = MODULE_DEFAULT;
  module_ctx->module_benchmark_salt           = MODULE_DEFAULT;
  module_ctx->module_build_plain_postprocess  = module_build_plain_postprocess;
  module_ctx->module_deep_comp_kernel         = MODULE_DEFAULT;
  module_ctx->module_deprecated_notice        = MODULE_DEFAULT;
  module_ctx->module_dgst_pos0                = module_dgst_pos0;
  module_ctx->module_dgst_pos1                = module_dgst_pos1;
  module_ctx->module_dgst_pos2                = module_dgst_pos2;
  module_ctx->module_dgst_pos3                = module_dgst_pos3;
  module_ctx->module_dgst_size                = module_dgst_size;
  module_ctx->module_dictstat_disable         = MODULE_DEFAULT;
  module_ctx->module_esalt_size               = module_esalt_size;
  module_ctx->module_extra_buffer_size        = MODULE_DEFAULT;
  module_ctx->module_extra_tmp_size           = MODULE_DEFAULT;
  module_ctx->module_extra_tuningdb_block     = MODULE_DEFAULT;
  module_ctx->module_forced_outfile_format    = MODULE_DEFAULT;
  module_ctx->module_hash_binary_count        = MODULE_DEFAULT;
  module_ctx->module_hash_binary_parse        = MODULE_DEFAULT;
  module_ctx->module_hash_binary_save         = MODULE_DEFAULT;
  module_ctx->module_hash_decode_postprocess  = module_hash_decode_postprocess;
  module_ctx->module_hash_decode_potfile      = MODULE_DEFAULT;
  module_ctx->module_hash_decode_zero_hash    = MODULE_DEFAULT;
  module_ctx->module_hash_decode              = module_hash_decode;
  module_ctx->module_hash_encode_status       = MODULE_DEFAULT;
  module_ctx->module_hash_encode_potfile      = MODULE_DEFAULT;
  module_ctx->module_hash_encode              = module_hash_encode;
  module_ctx->module_hash_init_selftest       = MODULE_DEFAULT;
  module_ctx->module_hash_mode                = MODULE_DEFAULT;
  module_ctx->module_hash_category            = module_hash_category;
  module_ctx->module_hash_name                = module_hash_name;
  module_ctx->module_hashes_count_min         = MODULE_DEFAULT;
  module_ctx->module_hashes_count_max         = MODULE_DEFAULT;
  module_ctx->module_hlfmt_disable            = MODULE_DEFAULT;
  module_ctx->module_hook_extra_param_size    = MODULE_DEFAULT;
  module_ctx->module_hook_extra_param_init    = MODULE_DEFAULT;
  module_ctx->module_hook_extra_param_term    = MODULE_DEFAULT;
  module_ctx->module_hook12                   = MODULE_DEFAULT;
  module_ctx->module_hook23                   = MODULE_DEFAULT;
  module_ctx->module_hook_salt_size           = MODULE_DEFAULT;
  module_ctx->module_hook_size                = MODULE_DEFAULT;
  module_ctx->module_jit_build_options        = module_jit_build_options;
  module_ctx->module_jit_cache_disable        = MODULE_DEFAULT;
  module_ctx->module_kernel_accel_max         = MODULE_DEFAULT;
  module_ctx->module_kernel_accel_min         = MODULE_DEFAULT;
  module_ctx->module_kernel_loops_max         = module_kernel_loops_max;
  module_ctx->module_kernel_loops_min         = MODULE_DEFAULT;
  module_ctx->module_kernel_threads_max       = MODULE_DEFAULT;
  module_ctx->module_kernel_threads_min       = MODULE_DEFAULT;
  module_ctx->module_kern_type                = module_kern_type;
  module_ctx->module_kern_type_dynamic        = MODULE_DEFAULT;
  module_ctx->module_opti_type                = module_opti_type;
  module_ctx->module_opts_type                = module_opts_type;
  module_ctx->module_outfile_check_disable    = MODULE_DEFAULT;
  module_ctx->module_outfile_check_nocomp     = MODULE_DEFAULT;
  module_ctx->module_potfile_custom_check     = MODULE_DEFAULT;
  module_ctx->module_potfile_disable          = MODULE_DEFAULT;
  module_ctx->module_potfile_keep_all_hashes  = MODULE_DEFAULT;
  module_ctx->module_pwdump_column            = MODULE_DEFAULT;
  module_ctx->module_pw_max                   = module_pw_max;
  module_ctx->module_pw_min                   = MODULE_DEFAULT;
  module_ctx->module_salt_max                 = MODULE_DEFAULT;
  module_ctx->module_salt_min                 = MODULE_DEFAULT;
  module_ctx->module_salt_type                = module_salt_type;
  module_ctx->module_separator                = MODULE_DEFAULT;
  module_ctx->module_st_hash                  = module_st_hash;
  module_ctx->module_st_pass                  = module_st_pass;
  module_ctx->module_tmp_size                 = module_tmp_size;
  module_ctx->module_unstable_warning         = module_unstable_warning;
  module_ctx->module_warmup_disable           = MODULE_DEFAULT;
}
