/**
 * 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"

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_8;
static const u32   HASH_CATEGORY  = HASH_CATEGORY_OS;
static const char *HASH_NAME      = "sha256crypt $5$, SHA256 (Unix)";
static const u64   KERN_TYPE      = 7400;
static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE;
static const u64   OPTS_TYPE      = OPTS_TYPE_PT_GENERATE_LE;
static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
static const char *ST_PASS        = "hashcat";
static const char *ST_HASH        = "$5$7777657035274252$XftMj84MW.New1/ViLY5V4CM4Y7EBvfETaZsCW9vcJ8";

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;         }

typedef struct sha256crypt_tmp
{
  u32 alt_result[8];
  u32 p_bytes[64];
  u32 s_bytes[64];

} sha256crypt_tmp_t;

static const u32   ROUNDS_SHA256CRYPT    = 5000;
static const char *SIGNATURE_SHA256CRYPT = "$5$";

static void sha256crypt_decode (u8 digest[32], const u8 buf[43])
{
  int l;

  l  = itoa64_to_int (buf[ 0]) <<  0;
  l |= itoa64_to_int (buf[ 1]) <<  6;
  l |= itoa64_to_int (buf[ 2]) << 12;
  l |= itoa64_to_int (buf[ 3]) << 18;

  digest[ 0] = (l >> 16) & 0xff;
  digest[10] = (l >>  8) & 0xff;
  digest[20] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[ 4]) <<  0;
  l |= itoa64_to_int (buf[ 5]) <<  6;
  l |= itoa64_to_int (buf[ 6]) << 12;
  l |= itoa64_to_int (buf[ 7]) << 18;

  digest[21] = (l >> 16) & 0xff;
  digest[ 1] = (l >>  8) & 0xff;
  digest[11] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[ 8]) <<  0;
  l |= itoa64_to_int (buf[ 9]) <<  6;
  l |= itoa64_to_int (buf[10]) << 12;
  l |= itoa64_to_int (buf[11]) << 18;

  digest[12] = (l >> 16) & 0xff;
  digest[22] = (l >>  8) & 0xff;
  digest[ 2] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[12]) <<  0;
  l |= itoa64_to_int (buf[13]) <<  6;
  l |= itoa64_to_int (buf[14]) << 12;
  l |= itoa64_to_int (buf[15]) << 18;

  digest[ 3] = (l >> 16) & 0xff;
  digest[13] = (l >>  8) & 0xff;
  digest[23] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[16]) <<  0;
  l |= itoa64_to_int (buf[17]) <<  6;
  l |= itoa64_to_int (buf[18]) << 12;
  l |= itoa64_to_int (buf[19]) << 18;

  digest[24] = (l >> 16) & 0xff;
  digest[ 4] = (l >>  8) & 0xff;
  digest[14] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[20]) <<  0;
  l |= itoa64_to_int (buf[21]) <<  6;
  l |= itoa64_to_int (buf[22]) << 12;
  l |= itoa64_to_int (buf[23]) << 18;

  digest[15] = (l >> 16) & 0xff;
  digest[25] = (l >>  8) & 0xff;
  digest[ 5] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[24]) <<  0;
  l |= itoa64_to_int (buf[25]) <<  6;
  l |= itoa64_to_int (buf[26]) << 12;
  l |= itoa64_to_int (buf[27]) << 18;

  digest[ 6] = (l >> 16) & 0xff;
  digest[16] = (l >>  8) & 0xff;
  digest[26] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[28]) <<  0;
  l |= itoa64_to_int (buf[29]) <<  6;
  l |= itoa64_to_int (buf[30]) << 12;
  l |= itoa64_to_int (buf[31]) << 18;

  digest[27] = (l >> 16) & 0xff;
  digest[ 7] = (l >>  8) & 0xff;
  digest[17] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[32]) <<  0;
  l |= itoa64_to_int (buf[33]) <<  6;
  l |= itoa64_to_int (buf[34]) << 12;
  l |= itoa64_to_int (buf[35]) << 18;

  digest[18] = (l >> 16) & 0xff;
  digest[28] = (l >>  8) & 0xff;
  digest[ 8] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[36]) <<  0;
  l |= itoa64_to_int (buf[37]) <<  6;
  l |= itoa64_to_int (buf[38]) << 12;
  l |= itoa64_to_int (buf[39]) << 18;

  digest[ 9] = (l >> 16) & 0xff;
  digest[19] = (l >>  8) & 0xff;
  digest[29] = (l >>  0) & 0xff;

  l  = itoa64_to_int (buf[40]) <<  0;
  l |= itoa64_to_int (buf[41]) <<  6;
  l |= itoa64_to_int (buf[42]) << 12;

  digest[31] = (l >>  8) & 0xff;
  digest[30] = (l >>  0) & 0xff;
}

static void sha256crypt_encode (const u8 digest[32], u8 buf[43])
{
  int l;

  l = (digest[ 0] << 16) | (digest[10] << 8) | (digest[20] << 0);

  buf[ 0] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 1] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 2] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 3] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[21] << 16) | (digest[ 1] << 8) | (digest[11] << 0);

  buf[ 4] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 5] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 6] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 7] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[12] << 16) | (digest[22] << 8) | (digest[ 2] << 0);

  buf[ 8] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[ 9] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[10] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[11] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[ 3] << 16) | (digest[13] << 8) | (digest[23] << 0);

  buf[12] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[13] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[14] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[15] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[24] << 16) | (digest[ 4] << 8) | (digest[14] << 0);

  buf[16] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[17] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[18] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[19] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[15] << 16) | (digest[25] << 8) | (digest[ 5] << 0);

  buf[20] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[21] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[22] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[23] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[ 6] << 16) | (digest[16] << 8) | (digest[26] << 0);

  buf[24] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[25] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[26] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[27] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[27] << 16) | (digest[ 7] << 8) | (digest[17] << 0);

  buf[28] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[29] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[30] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[31] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[18] << 16) | (digest[28] << 8) | (digest[ 8] << 0);

  buf[32] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[33] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[34] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[35] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l = (digest[ 9] << 16) | (digest[19] << 8) | (digest[29] << 0);

  buf[36] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[37] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[38] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[39] = int_to_itoa64 (l & 0x3f); //l >>= 6;

  l =                  0 | (digest[31] << 8) | (digest[30] << 0);

  buf[40] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[41] = int_to_itoa64 (l & 0x3f); l >>= 6;
  buf[42] = int_to_itoa64 (l & 0x3f); //l >>= 6;
}

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 (sha256crypt_tmp_t);

  return tmp_size;
}

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)
{
  u32 pw_max = PW_MAX;

  const bool optimized_kernel = (hashconfig->opti_type & OPTI_TYPE_OPTIMIZED_KERNEL);

  if (optimized_kernel == true)
  {
    pw_max = 15;
  }

  return pw_max;
}

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;

  hc_asprintf (&jit_build_options, "-D NO_UNROLL");

  return jit_build_options;
}

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;

  token_t token;

  token.token_cnt  = 3;

  token.signatures_cnt    = 1;
  token.signatures_buf[0] = SIGNATURE_SHA256CRYPT;

  token.len[0]     = 3;
  token.attr[0]    = TOKEN_ATTR_FIXED_LENGTH
                   | TOKEN_ATTR_VERIFY_SIGNATURE;

  token.len_min[1] = 0;
  token.len_max[1] = 20;
  token.sep[1]     = '$';
  token.attr[1]    = TOKEN_ATTR_VERIFY_LENGTH
                   | TOKEN_ATTR_OPTIONAL_ROUNDS;

  token.len[2]     = 43;
  token.attr[2]    = TOKEN_ATTR_FIXED_LENGTH
                   | TOKEN_ATTR_VERIFY_BASE64B;

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

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

  salt->salt_iter = ROUNDS_SHA256CRYPT;

  if (token.opt_len != -1)
  {
    salt->salt_iter = hc_strtoul ((const char *) token.opt_buf + 7, NULL, 10); // 7 = "rounds="
  }

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

  const bool parse_rc = generic_salt_decode (hashconfig, salt_pos, salt_len, (u8 *) salt->salt_buf, (int *) &salt->salt_len);

  if (parse_rc == false) return (PARSER_SALT_LENGTH);

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

  sha256crypt_decode ((u8 *) digest, hash_pos);

  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)
{
  char ptr_plain[48] = { 0 };

  sha256crypt_encode ((unsigned char *) digest_buf, (unsigned char *) ptr_plain);

  char tmp_salt[SALT_MAX * 2];

  const int salt_len = generic_salt_encode (hashconfig, (const u8 *) salt->salt_buf, (const int) salt->salt_len, (u8 *) tmp_salt);

  tmp_salt[salt_len] = 0;

  int line_len;

  if (salt->salt_iter == ROUNDS_SHA256CRYPT)
  {
    line_len = snprintf (line_buf, line_size, "$5$%s$%s", tmp_salt, ptr_plain);
  }
  else
  {
    line_len = snprintf (line_buf, line_size, "$5$rounds=%u$%s$%s", salt->salt_iter, tmp_salt, ptr_plain);
  }

  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_salt           = MODULE_DEFAULT;
  module_ctx->module_build_plain_postprocess  = MODULE_DEFAULT;
  module_ctx->module_deep_comp_kernel         = 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_DEFAULT;
  module_ctx->module_extra_buffer_size        = MODULE_DEFAULT;
  module_ctx->module_extra_tmp_size           = 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_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_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_DEFAULT;
  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_DEFAULT;
  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_DEFAULT;
  module_ctx->module_warmup_disable           = MODULE_DEFAULT;
}