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<?php
/**
* This file is part of PHPOffice Common
*
* PHPOffice Common is free software distributed under the terms of the GNU Lesser
* General Public License version 3 as published by the Free Software Foundation.
*
* For the full copyright and license information, please read the LICENSE
* file that was distributed with this source code. For the full list of
* contributors, visit https://github.com/PHPOffice/Common/contributors.
*
* @link https://github.com/PHPOffice/Common
* @copyright 2009-2016 PHPOffice Common contributors
* @license http://www.gnu.org/licenses/lgpl.txt LGPL version 3
*/
namespace PhpOffice\Common\Microsoft;
/**
* Password encoder for microsoft office applications
*/
class PasswordEncoder
{
const ALGORITHM_MD2 = 'MD2';
const ALGORITHM_MD4 = 'MD4';
const ALGORITHM_MD5 = 'MD5';
const ALGORITHM_SHA_1 = 'SHA-1';
const ALGORITHM_SHA_256 = 'SHA-256';
const ALGORITHM_SHA_384 = 'SHA-384';
const ALGORITHM_SHA_512 = 'SHA-512';
const ALGORITHM_RIPEMD = 'RIPEMD';
const ALGORITHM_RIPEMD_160 = 'RIPEMD-160';
const ALGORITHM_MAC = 'MAC';
const ALGORITHM_HMAC = 'HMAC';
/**
* Mapping between algorithm name and algorithm ID
*
* @var array
* @see https://msdn.microsoft.com/en-us/library/documentformat.openxml.wordprocessing.writeprotection.cryptographicalgorithmsid(v=office.14).aspx
*/
private static $algorithmMapping = array(
self::ALGORITHM_MD2 => array(1, 'md2'),
self::ALGORITHM_MD4 => array(2, 'md4'),
self::ALGORITHM_MD5 => array(3, 'md5'),
self::ALGORITHM_SHA_1 => array(4, 'sha1'),
self::ALGORITHM_MAC => array(5, ''), // 'mac' -> not possible with hash()
self::ALGORITHM_RIPEMD => array(6, 'ripemd'),
self::ALGORITHM_RIPEMD_160 => array(7, 'ripemd160'),
self::ALGORITHM_HMAC => array(9, ''), //'hmac' -> not possible with hash()
self::ALGORITHM_SHA_256 => array(12, 'sha256'),
self::ALGORITHM_SHA_384 => array(13, 'sha384'),
self::ALGORITHM_SHA_512 => array(14, 'sha512'),
);
private static $initialCodeArray = array(
0xE1F0,
0x1D0F,
0xCC9C,
0x84C0,
0x110C,
0x0E10,
0xF1CE,
0x313E,
0x1872,
0xE139,
0xD40F,
0x84F9,
0x280C,
0xA96A,
0x4EC3,
);
private static $encryptionMatrix = array(
array(0xAEFC, 0x4DD9, 0x9BB2, 0x2745, 0x4E8A, 0x9D14, 0x2A09),
array(0x7B61, 0xF6C2, 0xFDA5, 0xEB6B, 0xC6F7, 0x9DCF, 0x2BBF),
array(0x4563, 0x8AC6, 0x05AD, 0x0B5A, 0x16B4, 0x2D68, 0x5AD0),
array(0x0375, 0x06EA, 0x0DD4, 0x1BA8, 0x3750, 0x6EA0, 0xDD40),
array(0xD849, 0xA0B3, 0x5147, 0xA28E, 0x553D, 0xAA7A, 0x44D5),
array(0x6F45, 0xDE8A, 0xAD35, 0x4A4B, 0x9496, 0x390D, 0x721A),
array(0xEB23, 0xC667, 0x9CEF, 0x29FF, 0x53FE, 0xA7FC, 0x5FD9),
array(0x47D3, 0x8FA6, 0x0F6D, 0x1EDA, 0x3DB4, 0x7B68, 0xF6D0),
array(0xB861, 0x60E3, 0xC1C6, 0x93AD, 0x377B, 0x6EF6, 0xDDEC),
array(0x45A0, 0x8B40, 0x06A1, 0x0D42, 0x1A84, 0x3508, 0x6A10),
array(0xAA51, 0x4483, 0x8906, 0x022D, 0x045A, 0x08B4, 0x1168),
array(0x76B4, 0xED68, 0xCAF1, 0x85C3, 0x1BA7, 0x374E, 0x6E9C),
array(0x3730, 0x6E60, 0xDCC0, 0xA9A1, 0x4363, 0x86C6, 0x1DAD),
array(0x3331, 0x6662, 0xCCC4, 0x89A9, 0x0373, 0x06E6, 0x0DCC),
array(0x1021, 0x2042, 0x4084, 0x8108, 0x1231, 0x2462, 0x48C4),
);
private static $passwordMaxLength = 15;
/**
* Create a hashed password that MS Word will be able to work with
* @see https://blogs.msdn.microsoft.com/vsod/2010/04/05/how-to-set-the-editing-restrictions-in-word-using-open-xml-sdk-2-0/
*
* @param string $password
* @param string $algorithmName
* @param string $salt
* @param int $spinCount
* @return string
*/
public static function hashPassword($password, $algorithmName = self::ALGORITHM_SHA_1, $salt = null, $spinCount = 10000)
{
$origEncoding = mb_internal_encoding();
mb_internal_encoding('UTF-8');
$password = mb_substr($password, 0, min(self::$passwordMaxLength, mb_strlen($password)));
// Get the single-byte values by iterating through the Unicode characters of the truncated password.
// For each character, if the low byte is not equal to 0, take it. Otherwise, take the high byte.
$passUtf8 = mb_convert_encoding($password, 'UCS-2LE', 'UTF-8');
$byteChars = array();
for ($i = 0; $i < mb_strlen($password); $i++) {
$byteChars[$i] = ord(substr($passUtf8, $i * 2, 1));
if ($byteChars[$i] == 0) {
$byteChars[$i] = ord(substr($passUtf8, $i * 2 + 1, 1));
}
}
// build low-order word and hig-order word and combine them
$combinedKey = self::buildCombinedKey($byteChars);
// build reversed hexadecimal string
$hex = str_pad(strtoupper(dechex($combinedKey & 0xFFFFFFFF)), 8, '0', \STR_PAD_LEFT);
$reversedHex = $hex[6] . $hex[7] . $hex[4] . $hex[5] . $hex[2] . $hex[3] . $hex[0] . $hex[1];
$generatedKey = mb_convert_encoding($reversedHex, 'UCS-2LE', 'UTF-8');
// Implementation Notes List:
// Word requires that the initial hash of the password with the salt not be considered in the count.
// The initial hash of salt + key is not included in the iteration count.
$algorithm = self::getAlgorithm($algorithmName);
$generatedKey = hash($algorithm, $salt . $generatedKey, true);
for ($i = 0; $i < $spinCount; $i++) {
$generatedKey = hash($algorithm, $generatedKey . pack('CCCC', $i, $i >> 8, $i >> 16, $i >> 24), true);
}
$generatedKey = base64_encode($generatedKey);
mb_internal_encoding($origEncoding);
return $generatedKey;
}
/**
* Get algorithm from self::$algorithmMapping
*
* @param string $algorithmName
* @return string
*/
private static function getAlgorithm($algorithmName)
{
$algorithm = self::$algorithmMapping[$algorithmName][1];
if ($algorithm == '') {
$algorithm = 'sha1';
}
return $algorithm;
}
/**
* Returns the algorithm ID
*
* @param string $algorithmName
* @return int
*/
public static function getAlgorithmId($algorithmName)
{
return self::$algorithmMapping[$algorithmName][0];
}
/**
* Build combined key from low-order word and high-order word
*
* @param array $byteChars byte array representation of password
* @return int
*/
private static function buildCombinedKey($byteChars)
{
$byteCharsLength = count($byteChars);
// Compute the high-order word
// Initialize from the initial code array (see above), depending on the passwords length.
$highOrderWord = self::$initialCodeArray[$byteCharsLength - 1];
// For each character in the password:
// For every bit in the character, starting with the least significant and progressing to (but excluding)
// the most significant, if the bit is set, XOR the key’s high-order word with the corresponding word from
// the Encryption Matrix
for ($i = 0; $i < $byteCharsLength; $i++) {
$tmp = self::$passwordMaxLength - $byteCharsLength + $i;
$matrixRow = self::$encryptionMatrix[$tmp];
for ($intBit = 0; $intBit < 7; $intBit++) {
if (($byteChars[$i] & (0x0001 << $intBit)) != 0) {
$highOrderWord = ($highOrderWord ^ $matrixRow[$intBit]);
}
}
}
// Compute low-order word
// Initialize with 0
$lowOrderWord = 0;
// For each character in the password, going backwards
for ($i = $byteCharsLength - 1; $i >= 0; $i--) {
// low-order word = (((low-order word SHR 14) AND 0x0001) OR (low-order word SHL 1) AND 0x7FFF)) XOR character
$lowOrderWord = (((($lowOrderWord >> 14) & 0x0001) | (($lowOrderWord << 1) & 0x7FFF)) ^ $byteChars[$i]);
}
// Lastly, low-order word = (((low-order word SHR 14) AND 0x0001) OR (low-order word SHL 1) AND 0x7FFF)) XOR strPassword length XOR 0xCE4B.
$lowOrderWord = (((($lowOrderWord >> 14) & 0x0001) | (($lowOrderWord << 1) & 0x7FFF)) ^ $byteCharsLength ^ 0xCE4B);
// Combine the Low and High Order Word
return self::int32(($highOrderWord << 16) + $lowOrderWord);
}
/**
* Simulate behaviour of (signed) int32
*
* @codeCoverageIgnore
* @param int $value
* @return int
*/
private static function int32($value)
{
$value = ($value & 0xFFFFFFFF);
if ($value & 0x80000000) {
$value = -((~$value & 0xFFFFFFFF) + 1);
}
return $value;
}
}