/**
 * 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_INSIDE_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_4;
static const u32   HASH_CATEGORY  = HASH_CATEGORY_DOCUMENTS;
static const char *HASH_NAME      = "MS Office <= 2003 $0/$1, MD5 + RC4, collider #1";
static const u64   KERN_TYPE      = 9710;
static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE
                                  | OPTI_TYPE_PRECOMPUTE_INIT
                                  | OPTI_TYPE_NOT_ITERATED;
static const u64   OPTS_TYPE      = OPTS_TYPE_PT_GENERATE_LE
                                  | OPTS_TYPE_PT_ADD80
                                  | OPTS_TYPE_PT_ALWAYS_HEXIFY;
static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
static const char *ST_PASS        = "\x91\xb2\xe0\x62\xb9";
static const char *ST_HASH        = "$oldoffice$0*55045061647456688860411218030058*e7e24d163fbd743992d4b8892bf3f2f7*493410dbc832557d3fe1870ace8397e2";

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 oldoffice01
{
  u32 version;
  u32 encryptedVerifier[4];
  u32 encryptedVerifierHash[4];
  u32 rc4key[2];

} oldoffice01_t;

static const char *SIGNATURE_OLDOFFICE  = "$oldoffice$";
static const char *SIGNATURE_OLDOFFICE0 = "$oldoffice$0";
static const char *SIGNATURE_OLDOFFICE1 = "$oldoffice$1";

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 (oldoffice01_t);

  return esalt_size;
}

u32 module_kernel_threads_min (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_threads_min = 64; // RC4

  return kernel_threads_min;
}

u32 module_kernel_threads_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_threads_max = 64; // RC4

  return kernel_threads_max;
}

u32 module_pw_min (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 pw_min = 5; // RC4-40 fixed

  return pw_min;
}

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)
{
  const u32 pw_max = 5; // RC4-40 fixed

  return pw_max;
}

const char *module_benchmark_mask (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 "?b?b?b?b?b";
}

u32 module_forced_outfile_format (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 forced_outfile_format = OUTFILE_FMT_HASH | OUTFILE_FMT_HEXPLAIN;

  return forced_outfile_format;
}

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;

  oldoffice01_t *oldoffice01 = (oldoffice01_t *) esalt_buf;

  token_t token;

  token.token_cnt  = 5;

  token.signatures_cnt    = 2;
  token.signatures_buf[0] = SIGNATURE_OLDOFFICE0;
  token.signatures_buf[1] = SIGNATURE_OLDOFFICE1;

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

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

  token.len_min[2] = 32;
  token.len_max[2] = 32;
  token.sep[2]     = '*';
  token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH;

  token.len_min[3] = 32;
  token.len_max[3] = 32;
  token.sep[3]     = '*';
  token.attr[3]    = TOKEN_ATTR_VERIFY_LENGTH
                   | TOKEN_ATTR_VERIFY_HEX;

  token.len_min[4] = 32;
  token.len_max[4] = 32;
  token.sep[4]     = '*';
  token.attr[4]    = 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);

  const u8 *version_pos               = token.buf[1];
  const u8 *osalt_pos                 = token.buf[2];
  const u8 *encryptedVerifier_pos     = token.buf[3];
  const u8 *encryptedVerifierHash_pos = token.buf[4];

  // esalt

  const u32 version = *version_pos - 0x30;

  if (version != 0 && version != 1) return (PARSER_SALT_VALUE);

  oldoffice01->version = version;

  oldoffice01->encryptedVerifier[0] = hex_to_u32 (encryptedVerifier_pos +  0);
  oldoffice01->encryptedVerifier[1] = hex_to_u32 (encryptedVerifier_pos +  8);
  oldoffice01->encryptedVerifier[2] = hex_to_u32 (encryptedVerifier_pos + 16);
  oldoffice01->encryptedVerifier[3] = hex_to_u32 (encryptedVerifier_pos + 24);

  oldoffice01->encryptedVerifierHash[0] = hex_to_u32 (encryptedVerifierHash_pos +  0);
  oldoffice01->encryptedVerifierHash[1] = hex_to_u32 (encryptedVerifierHash_pos +  8);
  oldoffice01->encryptedVerifierHash[2] = hex_to_u32 (encryptedVerifierHash_pos + 16);
  oldoffice01->encryptedVerifierHash[3] = hex_to_u32 (encryptedVerifierHash_pos + 24);

  // salt

  salt->salt_len = 16;

  salt->salt_buf[ 0] = hex_to_u32 (osalt_pos +  0);
  salt->salt_buf[ 1] = hex_to_u32 (osalt_pos +  8);
  salt->salt_buf[ 2] = hex_to_u32 (osalt_pos + 16);
  salt->salt_buf[ 3] = hex_to_u32 (osalt_pos + 24);

  // this is a workaround as office produces multiple documents with the same salt

  salt->salt_buf[ 4] = oldoffice01->encryptedVerifier[0];
  salt->salt_buf[ 5] = oldoffice01->encryptedVerifier[1];
  salt->salt_buf[ 6] = oldoffice01->encryptedVerifier[2];
  salt->salt_buf[ 7] = oldoffice01->encryptedVerifier[3];
  salt->salt_buf[ 8] = oldoffice01->encryptedVerifierHash[0];
  salt->salt_buf[ 9] = oldoffice01->encryptedVerifierHash[1];
  salt->salt_buf[10] = oldoffice01->encryptedVerifierHash[2];
  salt->salt_buf[11] = oldoffice01->encryptedVerifierHash[3];

  salt->salt_len += 32;

  /**
   * digest
   */

  digest[0] = oldoffice01->encryptedVerifierHash[0];
  digest[1] = oldoffice01->encryptedVerifierHash[1];
  digest[2] = oldoffice01->encryptedVerifierHash[2];
  digest[3] = oldoffice01->encryptedVerifierHash[3];

  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 oldoffice01_t *oldoffice01 = (const oldoffice01_t *) esalt_buf;

  const int line_len = snprintf (line_buf, line_size, "%s%u*%08x%08x%08x%08x*%08x%08x%08x%08x*%08x%08x%08x%08x",
    SIGNATURE_OLDOFFICE,
    oldoffice01->version,
    byte_swap_32 (salt->salt_buf[0]),
    byte_swap_32 (salt->salt_buf[1]),
    byte_swap_32 (salt->salt_buf[2]),
    byte_swap_32 (salt->salt_buf[3]),
    byte_swap_32 (oldoffice01->encryptedVerifier[0]),
    byte_swap_32 (oldoffice01->encryptedVerifier[1]),
    byte_swap_32 (oldoffice01->encryptedVerifier[2]),
    byte_swap_32 (oldoffice01->encryptedVerifier[3]),
    byte_swap_32 (oldoffice01->encryptedVerifierHash[0]),
    byte_swap_32 (oldoffice01->encryptedVerifierHash[1]),
    byte_swap_32 (oldoffice01->encryptedVerifierHash[2]),
    byte_swap_32 (oldoffice01->encryptedVerifierHash[3]));

  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_benchmark_mask;
  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_esalt_size;
  module_ctx->module_extra_buffer_size        = MODULE_DEFAULT;
  module_ctx->module_extra_tmp_size           = MODULE_DEFAULT;
  module_ctx->module_forced_outfile_format    = module_forced_outfile_format;
  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_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_kernel_threads_max;
  module_ctx->module_kernel_threads_min       = module_kernel_threads_min;
  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_pw_min;
  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;
}
