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

//shared mem too small
//#define NEW_SIMD_CODE

#ifdef KERNEL_STATIC
#include "inc_vendor.h"
#include "inc_types.h"
#include "inc_common.cl"
#include "inc_rp_optimized.h"
#include "inc_rp_optimized.cl"
#include "inc_simd.cl"
#include "inc_hash_md4.cl"
#include "inc_hash_md5.cl"
#endif

typedef struct krb5pa
{
  u32 user[16];
  u32 realm[16];
  u32 salt[32];
  u32 timestamp[16];
  u32 checksum[4];

} krb5pa_t;

typedef struct
{
  u8 S[256];

  u32 wtf_its_faster;

} RC4_KEY;

DECLSPEC static void swap (LOCAL_AS RC4_KEY *rc4_key, const u8 i, const u8 j)
{
  u8 tmp;

  tmp           = rc4_key->S[i];
  rc4_key->S[i] = rc4_key->S[j];
  rc4_key->S[j] = tmp;
}

DECLSPEC static void rc4_init_16 (LOCAL_AS RC4_KEY *rc4_key, const u32 *data)
{
  u32 v = 0x03020100;
  u32 a = 0x04040404;

  LOCAL_AS u32 *ptr = (LOCAL_AS u32 *) rc4_key->S;

  #ifdef _unroll
  #pragma unroll
  #endif
  for (u32 i = 0; i < 64; i++)
  {
    *ptr++ = v; v += a;
  }

  u32 j = 0;

  for (u32 i = 0; i < 16; i++)
  {
    u32 idx = i * 16;

    u32 v;

    v = data[0];

    j += rc4_key->S[idx] + (v >>  0); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >>  8); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 16); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 24); swap (rc4_key, idx, j); idx++;

    v = data[1];

    j += rc4_key->S[idx] + (v >>  0); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >>  8); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 16); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 24); swap (rc4_key, idx, j); idx++;

    v = data[2];

    j += rc4_key->S[idx] + (v >>  0); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >>  8); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 16); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 24); swap (rc4_key, idx, j); idx++;

    v = data[3];

    j += rc4_key->S[idx] + (v >>  0); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >>  8); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 16); swap (rc4_key, idx, j); idx++;
    j += rc4_key->S[idx] + (v >> 24); swap (rc4_key, idx, j); idx++;
  }
}

DECLSPEC static u8 rc4_next_16 (LOCAL_AS RC4_KEY *rc4_key, u8 i, u8 j, const u32 *in, u32 *out)
{
  #ifdef _unroll
  #pragma unroll
  #endif
  for (u32 k = 0; k < 4; k++)
  {
    u32 xor4 = 0;

    u8 idx;

    i += 1;
    j += rc4_key->S[i];

    swap (rc4_key, i, j);

    idx = rc4_key->S[i] + rc4_key->S[j];

    xor4 |= rc4_key->S[idx] <<  0;

    i += 1;
    j += rc4_key->S[i];

    swap (rc4_key, i, j);

    idx = rc4_key->S[i] + rc4_key->S[j];

    xor4 |= rc4_key->S[idx] <<  8;

    i += 1;
    j += rc4_key->S[i];

    swap (rc4_key, i, j);

    idx = rc4_key->S[i] + rc4_key->S[j];

    xor4 |= rc4_key->S[idx] << 16;

    i += 1;
    j += rc4_key->S[i];

    swap (rc4_key, i, j);

    idx = rc4_key->S[i] + rc4_key->S[j];

    xor4 |= rc4_key->S[idx] << 24;

    out[k] = in[k] ^ xor4;
  }

  return j;
}

DECLSPEC static int decrypt_and_check (LOCAL_AS RC4_KEY *rc4_key, u32 *data, u32 *timestamp_ct)
{
  rc4_init_16 (rc4_key, data);

  u32 out[4];

  u8 j = 0;

  j = rc4_next_16 (rc4_key,  0, j, timestamp_ct + 0, out);

  if ((out[3] & 0xffff0000) != 0x30320000) return 0;

  j = rc4_next_16 (rc4_key, 16, j, timestamp_ct + 4, out);

  if (((out[0] & 0xff) < '0') || ((out[0] & 0xff) > '9')) return 0; out[0] >>= 8;
  if (((out[0] & 0xff) < '0') || ((out[0] & 0xff) > '9')) return 0; out[0] >>= 8;
  if (((out[0] & 0xff) < '0') || ((out[0] & 0xff) > '9')) return 0; out[0] >>= 8;
  if (((out[0] & 0xff) < '0') || ((out[0] & 0xff) > '9')) return 0;
  if (((out[1] & 0xff) < '0') || ((out[1] & 0xff) > '9')) return 0; out[1] >>= 8;
  if (((out[1] & 0xff) < '0') || ((out[1] & 0xff) > '9')) return 0; out[1] >>= 8;
  if (((out[1] & 0xff) < '0') || ((out[1] & 0xff) > '9')) return 0; out[1] >>= 8;
  if (((out[1] & 0xff) < '0') || ((out[1] & 0xff) > '9')) return 0;
  if (((out[2] & 0xff) < '0') || ((out[2] & 0xff) > '9')) return 0; out[2] >>= 8;
  if (((out[2] & 0xff) < '0') || ((out[2] & 0xff) > '9')) return 0; out[2] >>= 8;
  if (((out[2] & 0xff) < '0') || ((out[2] & 0xff) > '9')) return 0; out[2] >>= 8;
  if (((out[2] & 0xff) < '0') || ((out[2] & 0xff) > '9')) return 0;

  return 1;
}

DECLSPEC static void hmac_md5_pad (u32 *w0, u32 *w1, u32 *w2, u32 *w3, u32 *ipad, u32 *opad)
{
  w0[0] = w0[0] ^ 0x36363636;
  w0[1] = w0[1] ^ 0x36363636;
  w0[2] = w0[2] ^ 0x36363636;
  w0[3] = w0[3] ^ 0x36363636;
  w1[0] = w1[0] ^ 0x36363636;
  w1[1] = w1[1] ^ 0x36363636;
  w1[2] = w1[2] ^ 0x36363636;
  w1[3] = w1[3] ^ 0x36363636;
  w2[0] = w2[0] ^ 0x36363636;
  w2[1] = w2[1] ^ 0x36363636;
  w2[2] = w2[2] ^ 0x36363636;
  w2[3] = w2[3] ^ 0x36363636;
  w3[0] = w3[0] ^ 0x36363636;
  w3[1] = w3[1] ^ 0x36363636;
  w3[2] = w3[2] ^ 0x36363636;
  w3[3] = w3[3] ^ 0x36363636;

  ipad[0] = MD5M_A;
  ipad[1] = MD5M_B;
  ipad[2] = MD5M_C;
  ipad[3] = MD5M_D;

  md5_transform (w0, w1, w2, w3, ipad);

  w0[0] = w0[0] ^ 0x6a6a6a6a;
  w0[1] = w0[1] ^ 0x6a6a6a6a;
  w0[2] = w0[2] ^ 0x6a6a6a6a;
  w0[3] = w0[3] ^ 0x6a6a6a6a;
  w1[0] = w1[0] ^ 0x6a6a6a6a;
  w1[1] = w1[1] ^ 0x6a6a6a6a;
  w1[2] = w1[2] ^ 0x6a6a6a6a;
  w1[3] = w1[3] ^ 0x6a6a6a6a;
  w2[0] = w2[0] ^ 0x6a6a6a6a;
  w2[1] = w2[1] ^ 0x6a6a6a6a;
  w2[2] = w2[2] ^ 0x6a6a6a6a;
  w2[3] = w2[3] ^ 0x6a6a6a6a;
  w3[0] = w3[0] ^ 0x6a6a6a6a;
  w3[1] = w3[1] ^ 0x6a6a6a6a;
  w3[2] = w3[2] ^ 0x6a6a6a6a;
  w3[3] = w3[3] ^ 0x6a6a6a6a;

  opad[0] = MD5M_A;
  opad[1] = MD5M_B;
  opad[2] = MD5M_C;
  opad[3] = MD5M_D;

  md5_transform (w0, w1, w2, w3, opad);
}

DECLSPEC static void hmac_md5_run (u32 *w0, u32 *w1, u32 *w2, u32 *w3, u32 *ipad, u32 *opad, u32 *digest)
{
  digest[0] = ipad[0];
  digest[1] = ipad[1];
  digest[2] = ipad[2];
  digest[3] = ipad[3];

  md5_transform (w0, w1, w2, w3, digest);

  w0[0] = digest[0];
  w0[1] = digest[1];
  w0[2] = digest[2];
  w0[3] = digest[3];
  w1[0] = 0x80;
  w1[1] = 0;
  w1[2] = 0;
  w1[3] = 0;
  w2[0] = 0;
  w2[1] = 0;
  w2[2] = 0;
  w2[3] = 0;
  w3[0] = 0;
  w3[1] = 0;
  w3[2] = (64 + 16) * 8;
  w3[3] = 0;

  digest[0] = opad[0];
  digest[1] = opad[1];
  digest[2] = opad[2];
  digest[3] = opad[3];

  md5_transform (w0, w1, w2, w3, digest);
}

DECLSPEC static void kerb_prepare (const u32 *w0, const u32 *w1, const u32 pw_len, const u32 *checksum, u32 *digest)
{
  /**
   * pads
   */

  u32 w0_t[4];
  u32 w1_t[4];
  u32 w2_t[4];
  u32 w3_t[4];

  w0_t[0] = w0[0];
  w0_t[1] = w0[1];
  w0_t[2] = w0[2];
  w0_t[3] = w0[3];
  w1_t[0] = w1[0];
  w1_t[1] = w1[1];
  w1_t[2] = w1[2];
  w1_t[3] = w1[3];
  w2_t[0] = 0;
  w2_t[1] = 0;
  w2_t[2] = 0;
  w2_t[3] = 0;
  w3_t[0] = 0;
  w3_t[1] = 0;
  w3_t[2] = 0;
  w3_t[3] = 0;

  // K=MD4(Little_indian(UNICODE(pwd))

  append_0x80_2x4 (w0_t, w1_t, pw_len);

  make_utf16le (w1_t, w2_t, w3_t);
  make_utf16le (w0_t, w0_t, w1_t);

  w3_t[2] = pw_len * 8 * 2;
  w3_t[3] = 0;

  digest[0] = MD4M_A;
  digest[1] = MD4M_B;
  digest[2] = MD4M_C;
  digest[3] = MD4M_D;

  md4_transform (w0_t, w1_t, w2_t, w3_t, digest);

  // K1=MD5_HMAC(K,1); with 1 encoded as little indian on 4 bytes (01000000 in hexa);

  w0_t[0] = digest[0];
  w0_t[1] = digest[1];
  w0_t[2] = digest[2];
  w0_t[3] = digest[3];
  w1_t[0] = 0;
  w1_t[1] = 0;
  w1_t[2] = 0;
  w1_t[3] = 0;
  w2_t[0] = 0;
  w2_t[1] = 0;
  w2_t[2] = 0;
  w2_t[3] = 0;
  w3_t[0] = 0;
  w3_t[1] = 0;
  w3_t[2] = 0;
  w3_t[3] = 0;

  u32 ipad[4];
  u32 opad[4];

  hmac_md5_pad (w0_t, w1_t, w2_t, w3_t, ipad, opad);

  w0_t[0] = 1;
  w0_t[1] = 0x80;
  w0_t[2] = 0;
  w0_t[3] = 0;
  w1_t[0] = 0;
  w1_t[1] = 0;
  w1_t[2] = 0;
  w1_t[3] = 0;
  w2_t[0] = 0;
  w2_t[1] = 0;
  w2_t[2] = 0;
  w2_t[3] = 0;
  w3_t[0] = 0;
  w3_t[1] = 0;
  w3_t[2] = (64 + 4) * 8;
  w3_t[3] = 0;

  hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);

  // K3=MD5_HMAC(K1,checksum);

  w0_t[0] = digest[0];
  w0_t[1] = digest[1];
  w0_t[2] = digest[2];
  w0_t[3] = digest[3];
  w1_t[0] = 0;
  w1_t[1] = 0;
  w1_t[2] = 0;
  w1_t[3] = 0;
  w2_t[0] = 0;
  w2_t[1] = 0;
  w2_t[2] = 0;
  w2_t[3] = 0;
  w3_t[0] = 0;
  w3_t[1] = 0;
  w3_t[2] = 0;
  w3_t[3] = 0;

  hmac_md5_pad (w0_t, w1_t, w2_t, w3_t, ipad, opad);

  w0_t[0] = checksum[0];
  w0_t[1] = checksum[1];
  w0_t[2] = checksum[2];
  w0_t[3] = checksum[3];
  w1_t[0] = 0x80;
  w1_t[1] = 0;
  w1_t[2] = 0;
  w1_t[3] = 0;
  w2_t[0] = 0;
  w2_t[1] = 0;
  w2_t[2] = 0;
  w2_t[3] = 0;
  w3_t[0] = 0;
  w3_t[1] = 0;
  w3_t[2] = (64 + 16) * 8;
  w3_t[3] = 0;

  hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);
}

KERNEL_FQ void m07500_m04 (KERN_ATTR_RULES_ESALT (krb5pa_t))
{
  /**
   * modifier
   */

  const u64 lid = get_local_id (0);

  /**
   * base
   */

  const u64 gid = get_global_id (0);

  if (gid >= gid_max) return;

  u32 pw_buf0[4];
  u32 pw_buf1[4];

  pw_buf0[0] = pws[gid].i[0];
  pw_buf0[1] = pws[gid].i[1];
  pw_buf0[2] = pws[gid].i[2];
  pw_buf0[3] = pws[gid].i[3];
  pw_buf1[0] = pws[gid].i[4];
  pw_buf1[1] = pws[gid].i[5];
  pw_buf1[2] = pws[gid].i[6];
  pw_buf1[3] = pws[gid].i[7];

  const u32 pw_len = pws[gid].pw_len & 63;

  /**
   * salt
   */

  u32 checksum[4];

  checksum[0] = esalt_bufs[digests_offset].checksum[0];
  checksum[1] = esalt_bufs[digests_offset].checksum[1];
  checksum[2] = esalt_bufs[digests_offset].checksum[2];
  checksum[3] = esalt_bufs[digests_offset].checksum[3];

  u32 timestamp_ct[8];

  timestamp_ct[0] = esalt_bufs[digests_offset].timestamp[0];
  timestamp_ct[1] = esalt_bufs[digests_offset].timestamp[1];
  timestamp_ct[2] = esalt_bufs[digests_offset].timestamp[2];
  timestamp_ct[3] = esalt_bufs[digests_offset].timestamp[3];
  timestamp_ct[4] = esalt_bufs[digests_offset].timestamp[4];
  timestamp_ct[5] = esalt_bufs[digests_offset].timestamp[5];
  timestamp_ct[6] = esalt_bufs[digests_offset].timestamp[6];
  timestamp_ct[7] = esalt_bufs[digests_offset].timestamp[7];

  /**
   * shared
   */

  LOCAL_AS RC4_KEY rc4_keys[64];

  LOCAL_AS RC4_KEY *rc4_key = &rc4_keys[lid];

  /**
   * loop
   */

  for (u32 il_pos = 0; il_pos < il_cnt; il_pos += VECT_SIZE)
  {
    u32x w0[4] = { 0 };
    u32x w1[4] = { 0 };
    u32x w2[4] = { 0 };
    u32x w3[4] = { 0 };

    const u32x out_len = apply_rules_vect_optimized (pw_buf0, pw_buf1, pw_len, rules_buf, il_pos, w0, w1);

    /**
     * kerberos
     */

    u32 digest[4];

    kerb_prepare (w0, w1, out_len, checksum, digest);

    u32 tmp[4];

    tmp[0] = digest[0];
    tmp[1] = digest[1];
    tmp[2] = digest[2];
    tmp[3] = digest[3];

    if (decrypt_and_check (rc4_key, tmp, timestamp_ct) == 1)
    {
      if (atomic_inc (&hashes_shown[digests_offset]) == 0)
      {
        mark_hash (plains_buf, d_return_buf, salt_pos, digests_cnt, 0, digests_offset + 0, gid, il_pos, 0, 0);
      }
    }
  }
}

KERNEL_FQ void m07500_m08 (KERN_ATTR_RULES_ESALT (krb5pa_t))
{
}

KERNEL_FQ void m07500_m16 (KERN_ATTR_RULES_ESALT (krb5pa_t))
{
}

KERNEL_FQ void m07500_s04 (KERN_ATTR_RULES_ESALT (krb5pa_t))
{
  /**
   * modifier
   */

  const u64 lid = get_local_id (0);

  /**
   * base
   */

  const u64 gid = get_global_id (0);

  if (gid >= gid_max) return;

  u32 pw_buf0[4];
  u32 pw_buf1[4];

  pw_buf0[0] = pws[gid].i[0];
  pw_buf0[1] = pws[gid].i[1];
  pw_buf0[2] = pws[gid].i[2];
  pw_buf0[3] = pws[gid].i[3];
  pw_buf1[0] = pws[gid].i[4];
  pw_buf1[1] = pws[gid].i[5];
  pw_buf1[2] = pws[gid].i[6];
  pw_buf1[3] = pws[gid].i[7];

  const u32 pw_len = pws[gid].pw_len & 63;

  /**
   * salt
   */

  u32 checksum[4];

  checksum[0] = esalt_bufs[digests_offset].checksum[0];
  checksum[1] = esalt_bufs[digests_offset].checksum[1];
  checksum[2] = esalt_bufs[digests_offset].checksum[2];
  checksum[3] = esalt_bufs[digests_offset].checksum[3];

  u32 timestamp_ct[8];

  timestamp_ct[0] = esalt_bufs[digests_offset].timestamp[0];
  timestamp_ct[1] = esalt_bufs[digests_offset].timestamp[1];
  timestamp_ct[2] = esalt_bufs[digests_offset].timestamp[2];
  timestamp_ct[3] = esalt_bufs[digests_offset].timestamp[3];
  timestamp_ct[4] = esalt_bufs[digests_offset].timestamp[4];
  timestamp_ct[5] = esalt_bufs[digests_offset].timestamp[5];
  timestamp_ct[6] = esalt_bufs[digests_offset].timestamp[6];
  timestamp_ct[7] = esalt_bufs[digests_offset].timestamp[7];

  /**
   * shared
   */

  LOCAL_AS RC4_KEY rc4_keys[64];

  LOCAL_AS RC4_KEY *rc4_key = &rc4_keys[lid];

  /**
   * loop
   */

  for (u32 il_pos = 0; il_pos < il_cnt; il_pos += VECT_SIZE)
  {
    u32x w0[4] = { 0 };
    u32x w1[4] = { 0 };
    u32x w2[4] = { 0 };
    u32x w3[4] = { 0 };

    const u32x out_len = apply_rules_vect_optimized (pw_buf0, pw_buf1, pw_len, rules_buf, il_pos, w0, w1);

    /**
     * kerberos
     */

    u32 digest[4];

    kerb_prepare (w0, w1, out_len, checksum, digest);

    u32 tmp[4];

    tmp[0] = digest[0];
    tmp[1] = digest[1];
    tmp[2] = digest[2];
    tmp[3] = digest[3];

    if (decrypt_and_check (rc4_key, tmp, timestamp_ct) == 1)
    {
      if (atomic_inc (&hashes_shown[digests_offset]) == 0)
      {
        mark_hash (plains_buf, d_return_buf, salt_pos, digests_cnt, 0, digests_offset + 0, gid, il_pos, 0, 0);
      }
    }
  }
}

KERNEL_FQ void m07500_s08 (KERN_ATTR_RULES_ESALT (krb5pa_t))
{
}

KERNEL_FQ void m07500_s16 (KERN_ATTR_RULES_ESALT (krb5pa_t))
{
}