/**
 * 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 "emu_inc_hash_sha256.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_DATABASE_SERVER;
static const char *HASH_NAME = "PostgreSQL SCRAM-SHA-256";
static const u64 KERN_TYPE = 28600;
static const u32 OPTI_TYPE =
    OPTI_TYPE_ZERO_BYTE | OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
static const u64 OPTS_TYPE = OPTS_TYPE_PT_GENERATE_LE | OPTS_TYPE_ST_BASE64;
static const u32 SALT_TYPE = SALT_TYPE_EMBEDDED;
static const char *ST_PASS = "hashcat";
static const char *ST_HASH = "SCRAM-SHA-256$4096:IKfxzJ8Nq4PkLJCfgKcPmA==$"
                             "iRw3qwTp18uaBnsTOEExbtgWdKeBMbSSnZvqD4sdqLQ=:"
                             "hPciC1CcnBna3szR8Mf3MVc8t0W7QPbIHoMMrh4zRV0=";

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 postgres_sha256_tmp {
  u32 ipad[8];
  u32 opad[8];

  u32 dgst[8];
  u32 out[8];

} postgres_sha256_tmp_t;

typedef struct postgres_sha256 {
  u32 salt[16];
  u32 storedKey[16];

  u32 salt_len;
  u32 storedKey_len;

} postgres_sha256_t;

static const char *SIGNATURE_POSTGRES_SHA256 = "SCRAM-SHA-256";

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");
  }

  // HIP
  if (device_param->opencl_device_vendor_id == VENDOR_ID_AMD_USE_HIP) {
    hc_asprintf(&jit_build_options, "-D _unroll");
  }

  // ROCM
  if ((device_param->opencl_device_vendor_id == VENDOR_ID_AMD) &&
      (device_param->has_vperm == true)) {
    hc_asprintf(&jit_build_options, "-D _unroll");
  }

  return jit_build_options;
}

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(postgres_sha256_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(postgres_sha256_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)
{
  // this overrides the reductions of PW_MAX in case optimized kernel is
  // selected IOW, even in optimized kernel mode it support length 256

  const u32 pw_max = PW_MAX;

  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;

  postgres_sha256_t *postgres_sha256 = (postgres_sha256_t *)esalt_buf;

  hc_token_t token;

  token.token_cnt = 5;

  token.signatures_cnt = 1;
  token.signatures_buf[0] = SIGNATURE_POSTGRES_SHA256;

  token.sep[0] = '$';
  token.len_min[0] = 13;
  token.len_max[0] = 13;
  token.attr[0] = TOKEN_ATTR_VERIFY_LENGTH | TOKEN_ATTR_VERIFY_SIGNATURE;

  token.sep[1] = ':';
  token.len_min[1] = 1;
  token.len_max[1] = 7;
  token.attr[1] = TOKEN_ATTR_VERIFY_LENGTH | TOKEN_ATTR_VERIFY_DIGIT;

  token.sep[2] = '$';
  token.len_min[2] = 0;
  token.len_max[2] = 88; 
  token.attr[2] = TOKEN_ATTR_VERIFY_LENGTH | TOKEN_ATTR_VERIFY_BASE64A;

  token.sep[3] = ':';
  token.len_min[3] = 44;
  token.len_max[3] = 44;
  token.attr[3] = TOKEN_ATTR_VERIFY_LENGTH | TOKEN_ATTR_VERIFY_BASE64A;

  token.len[4] = 44;
  token.attr[4] = TOKEN_ATTR_FIXED_LENGTH | TOKEN_ATTR_VERIFY_BASE64A;

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

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

  // iter

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

  const u32 iter = hc_strtoul((const char *)iter_pos, NULL, 10);

  if (iter < 1)
    return (PARSER_SALT_ITERATION);

  salt->salt_iter = iter - 1;

  // salt
  u8 tmp_buf[100] = {0};

  const u8 *salt_pos = token.buf[2];
  const int salt_len = token.len[2];

  int tmp_len = base64_decode(base64_to_int, salt_pos, salt_len, tmp_buf);

  if (tmp_len > 64)
    return (PARSER_SALT_LENGTH);

  memcpy(postgres_sha256->salt, tmp_buf, tmp_len);

  postgres_sha256->salt[0] = byte_swap_32(postgres_sha256->salt[0]);
  postgres_sha256->salt[1] = byte_swap_32(postgres_sha256->salt[1]);
  postgres_sha256->salt[2] = byte_swap_32(postgres_sha256->salt[2]);
  postgres_sha256->salt[3] = byte_swap_32(postgres_sha256->salt[3]);
  postgres_sha256->salt[4] = byte_swap_32(postgres_sha256->salt[4]);
  postgres_sha256->salt[5] = byte_swap_32(postgres_sha256->salt[5]);
  postgres_sha256->salt[6] = byte_swap_32(postgres_sha256->salt[6]);
  postgres_sha256->salt[7] = byte_swap_32(postgres_sha256->salt[7]);
  postgres_sha256->salt[8] = byte_swap_32(postgres_sha256->salt[8]);
  postgres_sha256->salt[9] = byte_swap_32(postgres_sha256->salt[9]);
  postgres_sha256->salt[10] = byte_swap_32(postgres_sha256->salt[10]);
  postgres_sha256->salt[11] = byte_swap_32(postgres_sha256->salt[11]);
  postgres_sha256->salt[12] = byte_swap_32(postgres_sha256->salt[12]);
  postgres_sha256->salt[13] = byte_swap_32(postgres_sha256->salt[13]);
  postgres_sha256->salt[14] = byte_swap_32(postgres_sha256->salt[14]);
  postgres_sha256->salt[15] = byte_swap_32(postgres_sha256->salt[15]);

  postgres_sha256->salt_len = tmp_len;
  salt->salt_len = tmp_len;

  salt->salt_buf[0] = postgres_sha256->salt[0];
  salt->salt_buf[1] = postgres_sha256->salt[1];
  salt->salt_buf[2] = postgres_sha256->salt[2];
  salt->salt_buf[3] = postgres_sha256->salt[3];
  salt->salt_buf[4] = postgres_sha256->salt[4];
  salt->salt_buf[5] = postgres_sha256->salt[5];
  salt->salt_buf[6] = postgres_sha256->salt[6];
  salt->salt_buf[7] = postgres_sha256->salt[7];
  salt->salt_buf[8] = postgres_sha256->salt[8];
  salt->salt_buf[9] = postgres_sha256->salt[9];
  salt->salt_buf[10] = postgres_sha256->salt[10];
  salt->salt_buf[11] = postgres_sha256->salt[11];
  salt->salt_buf[12] = postgres_sha256->salt[12];
  salt->salt_buf[13] = postgres_sha256->salt[13];
  salt->salt_buf[14] = postgres_sha256->salt[14];
  salt->salt_buf[15] = postgres_sha256->salt[15];

  // stored key
  const u8 *stored_key_pos = token.buf[3];
  const int stored_key_len = token.len[3];

  memset(tmp_buf, 0, sizeof(tmp_buf));

  tmp_len = base64_decode(base64_to_int, stored_key_pos, stored_key_len, tmp_buf);

  memcpy(postgres_sha256->storedKey, tmp_buf, tmp_len);

  postgres_sha256->storedKey_len = tmp_len;

  // server key

  const u8 *hash_pos = token.buf[4];
  const int hash_len = token.len[4];

  memset(tmp_buf, 0, sizeof(tmp_buf));

  tmp_len = base64_decode(base64_to_int, hash_pos, hash_len, tmp_buf);

  if (tmp_len != 32)
    return (PARSER_HASH_LENGTH);

  memcpy(digest, tmp_buf, 32);

  digest[0] = byte_swap_32(digest[0]);
  digest[1] = byte_swap_32(digest[1]);
  digest[2] = byte_swap_32(digest[2]);
  digest[3] = byte_swap_32(digest[3]);
  digest[4] = byte_swap_32(digest[4]);
  digest[5] = byte_swap_32(digest[5]);
  digest[6] = byte_swap_32(digest[6]);
  digest[7] = byte_swap_32(digest[7]);

  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)
{
  u32 *digest = (u32 *)digest_buf;

  postgres_sha256_t *postgres_sha256 = (postgres_sha256_t *)esalt_buf;

  // salt

  u32 salt_buf[8] = {0}; // make the buffer large enough for base64_encode ()

  salt_buf[0] = byte_swap_32(postgres_sha256->salt[0]);
  salt_buf[1] = byte_swap_32(postgres_sha256->salt[1]);
  salt_buf[2] = byte_swap_32(postgres_sha256->salt[2]);
  salt_buf[3] = byte_swap_32(postgres_sha256->salt[3]);
  salt_buf[4] = byte_swap_32(postgres_sha256->salt[4]);
  salt_buf[5] = byte_swap_32(postgres_sha256->salt[5]);
  salt_buf[6] = byte_swap_32(postgres_sha256->salt[6]);
  salt_buf[7] = byte_swap_32(postgres_sha256->salt[7]);

  u8 salt_base64[64] = {0};

  base64_encode(int_to_base64, (const u8 *)salt_buf, salt->salt_len,
                salt_base64);

  // server key

  u32 hash[8] = {0}; // make the buffer large enough for base64_encode ()

  hash[0] = byte_swap_32(digest[0]);
  hash[1] = byte_swap_32(digest[1]);
  hash[2] = byte_swap_32(digest[2]);
  hash[3] = byte_swap_32(digest[3]);
  hash[4] = byte_swap_32(digest[4]);
  hash[5] = byte_swap_32(digest[5]);
  hash[6] = byte_swap_32(digest[6]);
  hash[7] = byte_swap_32(digest[7]);

  u8 server_key_base64[64] = {0};

  base64_encode(int_to_base64, (const u8 *)hash, 32, server_key_base64);

  // stored key

  u8 stored_key_bin[100] = { 0 };

  memcpy (stored_key_bin, (char *) postgres_sha256->storedKey, postgres_sha256->storedKey_len);

  u8 stored_key_base64[64] = {0};

  base64_encode(int_to_base64, stored_key_bin, postgres_sha256->storedKey_len, stored_key_base64);

  // print final line

  const int line_len =
      snprintf(line_buf, line_size, "%s$%u:%s$%s:%s", SIGNATURE_POSTGRES_SHA256,
               salt->salt_iter + 1, salt_base64, stored_key_base64, server_key_base64);
  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_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_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_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_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_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_DEFAULT;
  module_ctx->module_warmup_disable = MODULE_DEFAULT;
}