text: /**
   * 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_sha1.h"
  
  static const u32   ATTACK_EXEC    = ATTACK_EXEC_INSIDE_KERNEL;
  static const u32   DGST_POS0      = 3;
  static const u32   DGST_POS1      = 7;
  static const u32   DGST_POS2      = 2;
  static const u32   DGST_POS3      = 6;
  static const u32   DGST_SIZE      = DGST_SIZE_4_8;
  static const u32   HASH_CATEGORY  = HASH_CATEGORY_RAW_HASH_AUTHENTICATED;
  static const char *HASH_NAME      = "Amazon AWS4-HMAC-SHA256";
  static const u64   KERN_TYPE      = 28700;
  static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE
                                    | OPTI_TYPE_NOT_ITERATED;
  static const u64   OPTS_TYPE      = OPTS_TYPE_PT_GENERATE_BE
                                    | OPTS_TYPE_ST_ADD80;
  static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
  static const char *ST_PASS        = "hashcat";
  static const char *ST_HASH        = "$AWS-Sig-v4$0$20220221T000000Z$us-east-1$s3$421ab6e4af9f49fa30fa9c253fcfeb2ce91668e139e6b23303c5f75b04f8a3c4$3755ed2bc1b2346e003ccaa7d02ae8b73c72bcbe9f452ccf066c78504d786bbb";
  
  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;         }
  
  static const char *SIGNATURE_AWS_SIG_V4 = "$AWS-Sig-v4$0$";
  
  typedef struct aws4_sig_v4
  {
    u32 date[3];
    u32 date_len;
  
    u32 longdate[4];
    u32 longdate_len;
  
    u32 region[4];
    u32 region_len;
  
    u32 service[4];
    u32 service_len;
  
    u32 canonical[8];
    u32 canonical_len;
  
    u32 stringtosign[64];
    u32 stringtosign_len;
  
  } aws4_sig_v4_t;
  
  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 (aws4_sig_v4_t);
  
    return esalt_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)
  {
    // reduce pw_max by 4
  
    u32 pw_max = PW_MAX - 4;
  
    if (user_options->optimized_kernel_enable == true && hashconfig->has_optimized_kernel == true)
    {
      pw_max = PW_MAX_OLD - 4;
    }
  
    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;
  
    aws4_sig_v4_t *esalt = (aws4_sig_v4_t *) esalt_buf;
  
    hc_token_t token;
  
    token.token_cnt  = 6;
    token.signatures_cnt    = 1;
    token.signatures_buf[0] = SIGNATURE_AWS_SIG_V4;
  
    token.len[0]     = 14;
    token.attr[0]    = TOKEN_ATTR_FIXED_LENGTH
                     | TOKEN_ATTR_VERIFY_SIGNATURE;
  
    // longdate
    token.len_min[1] = 16;
    token.len_max[1] = 16;
    token.sep[1]     = '$';
    token.attr[1]    = TOKEN_ATTR_VERIFY_LENGTH;
  
    // region
    token.len_min[2] = 1;
    token.len_max[2] = 16;
    token.sep[2]     = '$';
    token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH;
  
    // service
    token.len_min[3] = 1;
    token.len_max[3] = 16;
    token.sep[3]     = '$';
    token.attr[3]    = TOKEN_ATTR_VERIFY_LENGTH;
  
    // canonical
    token.len_min[4] = 32 * 2;
    token.len_max[4] = 32 * 2;
    token.sep[4]     = '$';
    token.attr[4]    = TOKEN_ATTR_VERIFY_LENGTH
                     | TOKEN_ATTR_VERIFY_HEX;
  
    // digest
    token.len_min[5] = 32 * 2;
    token.len_max[5] = 32 * 2;
    token.sep[5]     = '$';
    token.attr[5]    = 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);
  
    memset (esalt, 0, sizeof (aws4_sig_v4_t));
  
    bool parse_rc = false;
  
    // longdate
  
    const u8 *longdate_pos = token.buf[1];
    const int longdate_len = token.len[1];
  
    parse_rc = generic_salt_decode (hashconfig, longdate_pos, longdate_len, (u8 *) esalt->longdate, (int *) &esalt->longdate_len);
  
    if (parse_rc == false) return (PARSER_SALT_LENGTH);
  
    // date
  
    parse_rc = generic_salt_decode (hashconfig, (u8 *) longdate_pos, 8, (u8 *) esalt->date, (int *) &esalt->date_len);
  
    if (parse_rc == false) return (PARSER_SALT_LENGTH);
  
    // region
  
    const u8 *region_pos = token.buf[2];
    const int region_len = token.len[2];
  
    parse_rc = generic_salt_decode (hashconfig, region_pos, region_len, (u8 *) esalt->region, (int *) &esalt->region_len);
  
    if (parse_rc == false) return (PARSER_SALT_LENGTH);
  
    // service
  
    const u8 *service_pos = token.buf[3];
    const int service_len = token.len[3];
  
    parse_rc = generic_salt_decode (hashconfig, service_pos, service_len, (u8 *) esalt->service, (int *) &esalt->service_len);
  
    if (parse_rc == false) return (PARSER_SALT_LENGTH);
  
    // canonical
  
    const u8 *canonical_pos = token.buf[4];
    const int canonical_len = token.len[4];
  
    esalt->canonical_len = hex_decode (canonical_pos, canonical_len, (u8 *) esalt->canonical);
  
    // handle unique salts detection
  
    sha1_ctx_t sha1_ctx;
  
    sha1_init   (&sha1_ctx);
    sha1_update (&sha1_ctx, esalt->canonical, esalt->canonical_len);
    sha1_final  (&sha1_ctx);
  
    // store sha1(esalt->canonical) in salt_buf
  
    salt->salt_iter = 1;
  
    salt->salt_len = 20;
  
    memcpy (salt->salt_buf, sha1_ctx.h, salt->salt_len);
  
    // stringtosign
  
    char *stringtosign_ptr = (char *) esalt->stringtosign;
  
    size_t off = 0;
  
    memcpy (stringtosign_ptr + off, (char *) "AWS4-HMAC-SHA256", 16);
    off += 16;
  
    stringtosign_ptr[off] = 0x0a;
    off += 1;
  
    memcpy (stringtosign_ptr + off, (char *) esalt->longdate, esalt->longdate_len);
    off += esalt->longdate_len;
  
    stringtosign_ptr[off] = 0x0a;
    off += 1;
  
    memcpy (stringtosign_ptr + off, (char *) esalt->date, esalt->date_len);
    off += esalt->date_len;
  
    stringtosign_ptr[off] = 0x2f;
    off += 1;
  
    memcpy (stringtosign_ptr + off, (char *) esalt->region, esalt->region_len);
    off += esalt->region_len;
  
    stringtosign_ptr[off] = 0x2f;
    off += 1;
  
    memcpy (stringtosign_ptr + off, (char *) esalt->service, esalt->service_len);
    off += esalt->service_len;
  
    stringtosign_ptr[off] = 0x2f;
    off += 1;
  
    memcpy (stringtosign_ptr + off, (char *) "aws4_request", 12);
    off += 12;
  
    stringtosign_ptr[off] = 0x0a;
    off += 1;
  
    memcpy (stringtosign_ptr + off, (char *) canonical_pos, canonical_len);
    off += canonical_len;
  
    esalt->stringtosign_len = off;
  
    // digest
  
    const u8 *hash_pos = token.buf[5];
  
    digest[0] = hex_to_u32 (hash_pos +  0);
    digest[1] = hex_to_u32 (hash_pos +  8);
    digest[2] = hex_to_u32 (hash_pos + 16);
    digest[3] = hex_to_u32 (hash_pos + 24);
    digest[4] = hex_to_u32 (hash_pos + 32);
    digest[5] = hex_to_u32 (hash_pos + 40);
    digest[6] = hex_to_u32 (hash_pos + 48);
    digest[7] = hex_to_u32 (hash_pos + 56);
  
    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)
  {
    const u32 *digest = (const u32 *) digest_buf;
  
    aws4_sig_v4_t *esalt = (aws4_sig_v4_t *) esalt_buf;
  
    u8 *out_buf = (u8 *) line_buf;
  
    // signature
  
    int out_len = snprintf (line_buf, line_size, "%s", SIGNATURE_AWS_SIG_V4);
  
    // longdate
  
    out_len += generic_salt_encode (hashconfig, (const u8 *) esalt->longdate, (const int) esalt->longdate_len, out_buf + out_len);
  
    out_buf[out_len] = '$';
  
    out_len++;
  
    // region
  
    out_len += generic_salt_encode (hashconfig, (const u8 *) esalt->region, (const int) esalt->region_len, out_buf + out_len);
  
    out_buf[out_len] = '$';
  
    out_len++;
  
    // service
  
    out_len += generic_salt_encode (hashconfig, (const u8 *) esalt->service, (const int) esalt->service_len, out_buf + out_len);
  
    out_buf[out_len] = '$';
  
    out_len++;
  
    // canonical
  
    out_len += hex_encode ((u8 *) esalt->canonical, esalt->canonical_len, out_buf + out_len);
  
    out_buf[out_len] = '$';
  
    out_len++;
  
    // digest
  
    u32 tmp[8];
  
    tmp[0] = digest[0];
    tmp[1] = digest[1];
    tmp[2] = digest[2];
    tmp[3] = digest[3];
    tmp[4] = digest[4];
    tmp[5] = digest[5];
    tmp[6] = digest[6];
    tmp[7] = digest[7];
  
    tmp[0] = byte_swap_32 (tmp[0]);
    tmp[1] = byte_swap_32 (tmp[1]);
    tmp[2] = byte_swap_32 (tmp[2]);
    tmp[3] = byte_swap_32 (tmp[3]);
    tmp[4] = byte_swap_32 (tmp[4]);
    tmp[5] = byte_swap_32 (tmp[5]);
    tmp[6] = byte_swap_32 (tmp[6]);
    tmp[7] = byte_swap_32 (tmp[7]);
  
    u32_to_hex (tmp[0], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[1], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[2], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[3], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[4], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[5], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[6], out_buf + out_len); out_len += 8;
    u32_to_hex (tmp[7], out_buf + out_len); out_len += 8;
  
    out_buf[out_len] = 0;
  
    return out_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_DEFAULT;
    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_DEFAULT;
    module_ctx->module_unstable_warning         = MODULE_DEFAULT;
    module_ctx->module_warmup_disable           = MODULE_DEFAULT;
  }
  