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<?php
/*
 * @version $Id: HEADER 15930 2011-10-30 15:47:55Z tsmr $
 -------------------------------------------------------------------------
 accounts plugin for GLPI
 Copyright (C) 2009-2022 by the accounts Development Team.

 https://github.com/InfotelGLPI/accounts
 -------------------------------------------------------------------------

 LICENSE

 This file is part of accounts.

 accounts is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 accounts is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with accounts. If not, see <http://www.gnu.org/licenses/>.
 --------------------------------------------------------------------------
 */


// ----------------------------------------------------------------------
// Original Author of file: GRISARD Jean Marc & CAILLAUD Xavier
// Purpose of file:
// ----------------------------------------------------------------------
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
/*  AES implementation in PHP (c) Chris Veness 2005-2009. Right of free use is granted for all    */
/*    commercial or non-commercial use under LGPL licence. No warranty of any form is offered.    */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */


/**
 * AES Cipher function: encrypt 'input' with Rijndael algorithm
 *
 * @param message $input
 * @param key $w
 * @return ciphertext as byte-array (16 bytes)
 * @internal param message $input as byte-array (16 bytes)
 * @internal param key $w schedule as 2D byte-array (Nr+1 x Nb bytes) -
 *              generated from the cipher key by KeyExpansion()
 */
function plugin_accounts_Cipher($input, $w) {
    // main Cipher function
   $Nb = 4;                 // block size (in words): no of columns in state (fixed at 4 for AES)
   $Nr = count($w) / $Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys

   $state = [];  // initialise 4xNb byte-array 'state' with input
   for ($i = 0; $i < 4 * $Nb; $i++) {
      $state[$i % 4][floor($i / 4)] = $input[$i];
   }

   $state = plugin_accounts_AddRoundKey($state, $w, 0, $Nb);

   for ($round = 1; $round < $Nr; $round++) {  // apply Nr rounds
      $state = plugin_accounts_SubBytes($state, $Nb);
      $state = plugin_accounts_ShiftRows($state, $Nb);
      $state = plugin_accounts_MixColumns($state, $Nb);
      $state = plugin_accounts_AddRoundKey($state, $w, $round, $Nb);
   }

   $state = plugin_accounts_SubBytes($state, $Nb);
   $state = plugin_accounts_ShiftRows($state, $Nb);
   $state = plugin_accounts_AddRoundKey($state, $w, $Nr, $Nb);

   $output = [4 * $Nb];  // convert state to 1-d array before returning
   for ($i = 0; $i < 4 * $Nb; $i++) {
      $output[$i] = $state[$i % 4][floor($i / 4)];
   }
   return $output;
}


/**
 * @param $state
 * @param $w
 * @param $rnd
 * @param $Nb
 * @return mixed
 */
function plugin_accounts_AddRoundKey($state, $w, $rnd, $Nb) {
   // xor Round Key into state S
   for ($r = 0; $r < 4; $r++) {
      for ($c = 0; $c < $Nb; $c++) {
         $state[$r][$c] ^= $w[$rnd * 4 + $c][$r];
      }
   }
   return $state;
}

/**
 * @param $s
 * @param $Nb
 * @return mixed
 */
function plugin_accounts_SubBytes($s, $Nb) {
    // apply SBox to state S
   global $Sbox;  // PHP needs explicit declaration to access global variables!
   for ($r = 0; $r < 4; $r++) {
      for ($c = 0; $c < $Nb; $c++) {
         $s[$r][$c] = $Sbox[$s[$r][$c]];
      }
   }
   return $s;
}

/**
 * @param $s
 * @param $Nb
 * @return mixed
 */
function plugin_accounts_ShiftRows($s, $Nb) {
    // shift row r of state S left by r bytes
   $t = [4];
   for ($r = 1; $r < 4; $r++) {
      for ($c = 0; $c < 4; $c++) {
         $t[$c] = $s[$r][($c + $r) % $Nb];  // shift into temp copy
      }
      for ($c = 0; $c < 4; $c++) {
         $s[$r][$c] = $t[$c];         // and copy back
      }
   }          // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES):
   return $s;  // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf
}

/**
 * @param $s
 * @param $Nb
 * @return mixed
 */
function plugin_accounts_MixColumns($s, $Nb) {
   // combine bytes of each col of state S
   for ($c = 0; $c < 4; $c++) {
      $a = [4];  // 'a' is a copy of the current column from 's'
      $b = [4];  // 'b'
      for ($i = 0; $i < 4; $i++) {
         $a[$i] = $s[$i][$c];
         $b[$i] = $s[$i][$c] & 0x80 ? $s[$i][$c] << 1 ^ 0x011b : $s[$i][$c] << 1;
      }
      // a[n] ^ b[n]
      $s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3]; // 2*a0 + 3*a1 + a2 + a3
      $s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3]; // a0 * 2*a1 + 3*a2 + a3
      $s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3]; // a0 + a1 + 2*a2 + 3*a3
      $s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3]; // 3*a0 + a1 + a2 + 2*a3
   }
   return $s;
}

/**
 * Key expansion for Rijndael Cipher(): performs key expansion on cipher key
 * to generate a key schedule
 *
 * @param cipher $key
 * @return key schedule as 2D byte-array (Nr+1 x Nb bytes)
 * @internal param cipher $key key byte-array (16 bytes)
 */
function plugin_accounts_KeyExpansion($key) {
   // generate Key Schedule from Cipher Key
   global $Rcon;  // PHP needs explicit declaration to access global variables!
   $Nb = 4;              // block size (in words): no of columns in state (fixed at 4 for AES)
   $Nk = count($key) / 4;  // key length (in words): 4/6/8 for 128/192/256-bit keys
   $Nr = $Nk + 6;        // no of rounds: 10/12/14 for 128/192/256-bit keys

   $w = [];
   $temp = [];

   for ($i = 0; $i < $Nk; $i++) {
      $r = [$key[4 * $i], $key[4 * $i + 1], $key[4 * $i + 2], $key[4 * $i + 3]];
      $w[$i] = $r;
   }

   for ($i = $Nk; $i < ($Nb * ($Nr + 1)); $i++) {
      $w[$i] = [];
      for ($t = 0; $t < 4; $t++) {
         $temp[$t] = $w[$i - 1][$t];
      }
      if ($i % $Nk == 0) {
         $temp = plugin_accounts_SubWord(plugin_accounts_RotWord($temp));
         for ($t = 0; $t < 4; $t++) {
            $temp[$t] ^= $Rcon[$i / $Nk][$t];
         }
      } else if ($Nk > 6 && $i % $Nk == 4) {
         $temp = plugin_accounts_SubWord($temp);
      }
      for ($t = 0; $t < 4; $t++) {
         $w[$i][$t] = $w[$i - $Nk][$t] ^ $temp[$t];
      }
   }
   return $w;
}

/**
 * @param $w
 * @return mixed
 */
function plugin_accounts_SubWord($w) {
    // apply SBox to 4-byte word w
   global $Sbox;  // PHP needs explicit declaration to access global variables!
   for ($i = 0; $i < 4; $i++) {
      $w[$i] = $Sbox[$w[$i]];
   }
   return $w;
}

/**
 * @param $w
 * @return mixed
 */
function plugin_accounts_RotWord($w) {
    // rotate 4-byte word w left by one byte
   $tmp = $w[0];
   for ($i = 0; $i < 3; $i++) {
      $w[$i] = $w[$i + 1];
   }
   $w[3] = $tmp;
   return $w;
}

// Sbox is pre-computed multiplicative inverse in GF(2^8) used in SubBytes and KeyExpansion
$Sbox = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
   0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
   0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
   0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
   0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
   0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
   0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
   0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
   0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
   0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
   0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
   0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
   0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
   0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
   0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
   0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16];

// Rcon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)]
$Rcon = [[0x00, 0x00, 0x00, 0x00],
   [0x01, 0x00, 0x00, 0x00],
   [0x02, 0x00, 0x00, 0x00],
   [0x04, 0x00, 0x00, 0x00],
   [0x08, 0x00, 0x00, 0x00],
   [0x10, 0x00, 0x00, 0x00],
   [0x20, 0x00, 0x00, 0x00],
   [0x40, 0x00, 0x00, 0x00],
   [0x80, 0x00, 0x00, 0x00],
   [0x1b, 0x00, 0x00, 0x00],
   [0x36, 0x00, 0x00, 0x00]];


/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */

/**
 * Encrypt a text using AES encryption in Counter mode of operation
 *  - see http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
 *
 * Unicode multi-byte character safe
 *
 * @param source $plaintext
 * @param the $password
 * @param number $nBits
 * @return encrypted text
 * @internal param source $plaintext text to be encrypted
 * @internal param the $password password to use to generate a key
 * @internal param number $nBits of bits to be used in the key (128, 192, or 256)
 */
function plugin_accounts_AESEncryptCtr($plaintext, $password, $nBits) {
   $blockSize = 16;  // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
   if (!($nBits == 128 || $nBits == 192 || $nBits == 256)) {
      return '';  // standard allows 128/192/256 bit keys
   }
   // note PHP (5) gives us plaintext and password in UTF8 encoding!

   // use AES itself to encrypt password to get cipher key (using plain password as source for
   // key expansion) - gives us well encrypted key
   $nBytes = $nBits / 8;  // no bytes in key
   $pwBytes = [];
   for ($i = 0; $i < $nBytes; $i++) {
      $pwBytes[$i] = ord(substr($password, $i, 1)) & 0xff;
   }
   $key = plugin_accounts_Cipher($pwBytes, plugin_accounts_KeyExpansion($pwBytes));
   $key = array_merge($key, array_slice($key, 0, $nBytes - 16));  // expand key to 16/24/32 bytes long

   // initialise counter block (NIST SP800-38A): millisecond time-stamp for nonce in
   // 1st 8 bytes, block counter in 2nd 8 bytes
   $counterBlock = [];
   $nonce = floor(microtime(true) * 1000);   // timestamp: milliseconds since 1-Jan-1970
   $nonceSec = floor($nonce / 1000);
   $nonceMs = $nonce % 1000;
   // encode nonce with seconds in 1st 4 bytes, and (repeated) ms part filling 2nd 4 bytes
   for ($i = 0; $i < 4; $i++) {
      $counterBlock[$i] = plugin_accounts_urs($nonceSec, $i * 8) & 0xff;
   }
   for ($i = 0; $i < 4; $i++) {
      $counterBlock[$i + 4] = $nonceMs & 0xff;
   }
   // and convert it to a string to go on the front of the ciphertext
   $ctrTxt = '';
   for ($i = 0; $i < 8; $i++) {
      $ctrTxt .= chr($counterBlock[$i]);
   }

   // generate key schedule - an expansion of the key into distinct Key Rounds for each round
   $keySchedule = plugin_accounts_KeyExpansion($key);

   $blockCount = ceil(strlen($plaintext) / $blockSize);
   $ciphertxt = [];  // ciphertext as array of strings

   for ($b = 0; $b < $blockCount; $b++) {
      // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
      // done in two stages for 32-bit ops: using two words allows us to go past 2^32 blocks (68GB)
      for ($c = 0; $c < 4; $c++) {
         $counterBlock[15 - $c] = plugin_accounts_urs($b, $c * 8) & 0xff;
      }
      for ($c = 0; $c < 4; $c++) {
         $counterBlock[15 - $c - 4] = plugin_accounts_urs($b / 4294967296, $c * 8);
      }

      $cipherCntr = plugin_accounts_Cipher($counterBlock, $keySchedule);  // -- encrypt counter block --

      // block size is reduced on final block
      $blockLength = $b < $blockCount - 1 ? $blockSize : (strlen($plaintext) - 1) % $blockSize + 1;
      $cipherByte = [];

      for ($i = 0; $i < $blockLength; $i++) {  // -- xor plaintext with ciphered counter byte-by-byte --
         $cipherByte[$i] = $cipherCntr[$i] ^ ord(substr($plaintext, $b * $blockSize + $i, 1));
         $cipherByte[$i] = chr($cipherByte[$i]);
      }
      $ciphertxt[$b] = implode('', $cipherByte);  // escape troublesome characters in ciphertext
   }

   // implode is more efficient than repeated string concatenation
   $ciphertext = $ctrTxt . implode('', $ciphertxt);
   $ciphertext = base64_encode($ciphertext);
   return $ciphertext;
}


/**
 * Decrypt a text encrypted by AES in counter mode of operation
 *
 * @param source $ciphertext
 * @param the $password
 * @param number $nBits
 * @return decrypted text
 * @internal param source $ciphertext text to be decrypted
 * @internal param the $password password to use to generate a key
 * @internal param number $nBits of bits to be used in the key (128, 192, or 256)
 */
function plugin_accounts_AESDecryptCtr($ciphertext, $password, $nBits) {
   $blockSize = 16;  // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
   if (!($nBits == 128 || $nBits == 192 || $nBits == 256)) {
      return '';  // standard allows 128/192/256 bit keys
   }
   $ciphertext = base64_decode($ciphertext);

   // use AES to encrypt password (mirroring encrypt routine)
   $nBytes = $nBits / 8;  // no bytes in key
   $pwBytes = [];
   for ($i = 0; $i < $nBytes; $i++) {
      $pwBytes[$i] = ord(substr($password, $i, 1)) & 0xff;
   }
   $key = plugin_accounts_Cipher($pwBytes, plugin_accounts_KeyExpansion($pwBytes));
   $key = array_merge($key, array_slice($key, 0, $nBytes - 16));  // expand key to 16/24/32 bytes long

   // recover nonce from 1st element of ciphertext
   $counterBlock = [];
   $ctrTxt = substr($ciphertext, 0, 8);
   for ($i = 0; $i < 8; $i++) {
      $counterBlock[$i] = ord(substr($ctrTxt, $i, 1));
   }

   // generate key schedule
   $keySchedule = plugin_accounts_KeyExpansion($key);

   // separate ciphertext into blocks (skipping past initial 8 bytes)
   $nBlocks = ceil((strlen($ciphertext) - 8) / $blockSize);
   $ct = [];
   for ($b = 0; $b < $nBlocks; $b++) {
      $ct[$b] = substr($ciphertext, 8 + $b * $blockSize, 16);
   }
   $ciphertext = $ct;  // ciphertext is now array of block-length strings

   // plaintext will get generated block-by-block into array of block-length strings
   $plaintxt = [];

   for ($b = 0; $b < $nBlocks; $b++) {
      // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
      for ($c = 0; $c < 4; $c++) {
         $counterBlock[15 - $c] = plugin_accounts_urs($b, $c * 8) & 0xff;
      }
      for ($c = 0; $c < 4; $c++) {
         $counterBlock[15 - $c - 4] = plugin_accounts_urs(($b + 1) / 4294967296 - 1, $c * 8) & 0xff;
      }

      $cipherCntr = plugin_accounts_Cipher($counterBlock, $keySchedule);  // encrypt counter block

      $plaintxtByte = [];
      for ($i = 0; $i < strlen($ciphertext[$b]); $i++) {
         // -- xor plaintext with ciphered counter byte-by-byte --
         $plaintxtByte[$i] = $cipherCntr[$i] ^ ord(substr($ciphertext[$b], $i, 1));
         $plaintxtByte[$i] = chr($plaintxtByte[$i]);

      }
      $plaintxt[$b] = implode('', $plaintxtByte);
   }

   // join array of blocks into single plaintext string
   $plaintext = implode('', $plaintxt);

   return $plaintext;
}


/*
 * Unsigned right shift function, since PHP has neither >>> operator nor unsigned ints
*
* @param a  number to be shifted (32-bit integer)
* @param b  number of bits to shift a to the right (0..31)
* @return   a right-shifted and zero-filled by b bits
*/
// function urs($a, $b) {
// $a &= 0xffffffff; $b &= 0x1f;  // (bounds check)
// if ($a&0x80000000 && $b>0) {   // if left-most bit set
// $a = ($a>>1) & 0x7fffffff;   //   right-shift one bit & clear left-most bit
// $a = $a >> ($b-1);           //   remaining right-shifts
// } else {                       // otherwise
// $a = ($a>>$b);               //   use normal right-shift
// }
// return $a;
// }

/**
 * @param $a
 * @param $b
 * @return number
 */
function plugin_accounts_urs($a, $b) {
   return bindec("0" . substr(decbin($a), $b));
}

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