Utility to get an Office compatible hash of a password

CHANGELOG.md

@@ -42,4 +42,10 @@
 ## 0.2.6
 
 ### Changes
-- `\PhpOffice\Common\Text::utf8ToUnicode()` became `public`.
+- `\PhpOffice\Common\Text::utf8ToUnicode()` became `public`.
+
+## 0.2.7
+
+### Features
+- Added `\PhpOffice\Common\File::fileGetContents()` (with support of zip://)
+- Added Support for PHP 7.1

VERSION

@@ -1 +1 @@
-0.2.6
+0.2.7

src/Common/File.php

@@ -51,6 +51,33 @@ public static function fileExists($pFilename)
             return file_exists($pFilename);
         }
     }
+    /**
+     * Returns the content of a file
+     *
+     * @param  string $pFilename Filename
+     * @return string
+     */
+    public static function fileGetContents($pFilename)
+    {
+        if (!self::fileExists($pFilename)) {
+            return false;
+        }
+        if (strtolower(substr($pFilename, 0, 3)) == 'zip') {
+            // Open ZIP file and verify if the file exists
+            $zipFile     = substr($pFilename, 6, strpos($pFilename, '#') - 6);
+            $archiveFile = substr($pFilename, strpos($pFilename, '#') + 1);
+
+            $zip = new \ZipArchive();
+            if ($zip->open($zipFile) === true) {
+                $returnValue = $zip->getFromName($archiveFile);
+                $zip->close();
+                return $returnValue;
+            }
+            return false;
+        }
+        // Regular file contents
+        return file_get_contents($pFilename);
+    }
 
     /**
      * Returns canonicalized absolute pathname, also for ZIP archives

src/Common/Microsoft/PasswordEncoder.php

@@ -0,0 +1,234 @@
+<?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 sting $algorithmName
+     * @return int
+     */
+    public static function getAlgorithmId($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;
+    }
+}

tests/Common/Tests/FileTest.php

@@ -37,6 +37,18 @@ public function testFileExists()
         $this->assertFalse(File::fileExists('zip://'.$pathResources.'files'.DIRECTORY_SEPARATOR.'404.pptx#404.xml'));
     }
 
+    /**
+     */
+    public function testGetFileContents()
+    {
+        $pathResources = PHPOFFICE_COMMON_TESTS_BASE_DIR.DIRECTORY_SEPARATOR.'resources'.DIRECTORY_SEPARATOR;
+        $this->assertInternalType('string', File::fileGetContents($pathResources.'images'.DIRECTORY_SEPARATOR.'PHPPowerPointLogo.png'));
+        $this->assertFalse(File::fileGetContents($pathResources.'images'.DIRECTORY_SEPARATOR.'PHPPowerPointLogo_404.png'));
+        $this->assertInternalType('string', File::fileGetContents('zip://'.$pathResources.'files'.DIRECTORY_SEPARATOR.'Sample_01_Simple.pptx#[Content_Types].xml'));
+        $this->assertFalse(File::fileGetContents('zip://'.$pathResources.'files'.DIRECTORY_SEPARATOR.'Sample_01_Simple.pptx#404.xml'));
+        $this->assertFalse(File::fileGetContents('zip://'.$pathResources.'files'.DIRECTORY_SEPARATOR.'404.pptx#404.xml'));
+    }
+
     /**
      */
     public function testRealPath()

tests/Common/Tests/Microsoft/PasswordEncoderTest.php

@@ -0,0 +1,89 @@
+<?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\Tests\Microsoft;
+
+use PhpOffice\Common\Microsoft\PasswordEncoder;
+
+/**
+ * Test class for PhpOffice\Common\PasswordEncoder
+ * @coversDefaultClass \PhpOffice\Common\PasswordEncoder
+ */
+class PasswordEncoderTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Test that a password can be hashed without specifying any additional parameters
+     */
+    public function testEncodePassword()
+    {
+        //given
+        $password = 'test';
+
+        //when
+        $hashPassword = PasswordEncoder::hashPassword($password);
+
+        //then
+        $this->assertEquals('M795/MAlmGU8RIsY9Q9uDLHC7bk=', $hashPassword);
+    }
+
+    /**
+     * Test that a password can be hashed with a custom salt
+     */
+    public function testEncodePasswordWithSalt()
+    {
+        //given
+        $password = 'test';
+        $salt = base64_decode('uq81pJRRGFIY5U+E9gt8tA==');
+
+        //when
+        $hashPassword = PasswordEncoder::hashPassword($password, PasswordEncoder::ALGORITHM_SHA_1, $salt);
+
+        //then
+        $this->assertEquals('QiDOcpia1YzSVJPiKPwWebl9p/0=', $hashPassword);
+    }
+
+    /**
+     * Test that the encoder falls back on SHA-1 if a non supported algorithm is given
+     */
+    public function testDefaultsToSha1IfUnsupportedAlgorithm()
+    {
+        //given
+        $password = 'test';
+        $salt = base64_decode('uq81pJRRGFIY5U+E9gt8tA==');
+
+        //when
+        $hashPassword = PasswordEncoder::hashPassword($password, PasswordEncoder::ALGORITHM_MAC, $salt);
+
+        //then
+        $this->assertEquals('QiDOcpia1YzSVJPiKPwWebl9p/0=', $hashPassword);
+    }
+
+    /**
+     * Test that the encoder falls back on SHA-1 if a non supported algorithm is given
+     */
+    public function testEncodePasswordWithNullAsciiCodeInPassword()
+    {
+        //given
+        $password = 'test' . chr(0);
+        $salt = base64_decode('uq81pJRRGFIY5U+E9gt8tA==');
+
+        //when
+        $hashPassword = PasswordEncoder::hashPassword($password, PasswordEncoder::ALGORITHM_MAC, $salt, 1);
+
+        //then
+        $this->assertEquals('rDV9sgdDsztoCQlvRCb1lF2wxNg=', $hashPassword);
+    }
+}