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1 <?php
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2 // +-----------------------------------------------------------------------+
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3 // | Copyright (c) 2002-2003 Richard Heyes |
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4 // | All rights reserved. |
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5 // | |
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6 // | Redistribution and use in source and binary forms, with or without |
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7 // | modification, are permitted provided that the following conditions |
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8 // | are met: |
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9 // | |
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10 // | o Redistributions of source code must retain the above copyright |
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11 // | notice, this list of conditions and the following disclaimer. |
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12 // | o Redistributions in binary form must reproduce the above copyright |
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13 // | notice, this list of conditions and the following disclaimer in the |
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14 // | documentation and/or other materials provided with the distribution.|
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15 // | o The names of the authors may not be used to endorse or promote |
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16 // | products derived from this software without specific prior written |
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17 // | permission. |
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18 // | |
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19 // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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20 // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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21 // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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22 // | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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23 // | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 // | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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25 // | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 // | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 // | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 // | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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29 // | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 // | |
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31 // +-----------------------------------------------------------------------+
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32 // | Author: Richard Heyes <richard@php.net> |
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33 // +-----------------------------------------------------------------------+
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34 //
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35 // $Id$
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36
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37 /**
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38 * Common functionality to SASL mechanisms
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39 *
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40 * @author Richard Heyes <richard@php.net>
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41 * @access public
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42 * @version 1.0
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43 * @package Auth_SASL
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44 */
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45
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46 class Auth_SASL_Common
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47 {
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48 /**
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49 * Function which implements HMAC MD5 digest
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50 *
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51 * @param string $key The secret key
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52 * @param string $data The data to hash
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53 * @param bool $raw_output Whether the digest is returned in binary or hexadecimal format.
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54 *
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55 * @return string The HMAC-MD5 digest
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56 */
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57 function _HMAC_MD5($key, $data, $raw_output = FALSE)
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58 {
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59 if (strlen($key) > 64) {
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60 $key = pack('H32', md5($key));
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61 }
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62
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63 if (strlen($key) < 64) {
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64 $key = str_pad($key, 64, chr(0));
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65 }
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66
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67 $k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
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68 $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);
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69
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70 $inner = pack('H32', md5($k_ipad . $data));
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71 $digest = md5($k_opad . $inner, $raw_output);
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72
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73 return $digest;
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74 }
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75
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76 /**
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77 * Function which implements HMAC-SHA-1 digest
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78 *
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79 * @param string $key The secret key
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80 * @param string $data The data to hash
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81 * @param bool $raw_output Whether the digest is returned in binary or hexadecimal format.
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82 * @return string The HMAC-SHA-1 digest
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83 * @author Jehan <jehan.marmottard@gmail.com>
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84 * @access protected
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85 */
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86 protected function _HMAC_SHA1($key, $data, $raw_output = FALSE)
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87 {
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88 if (strlen($key) > 64) {
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89 $key = sha1($key, TRUE);
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90 }
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91
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92 if (strlen($key) < 64) {
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93 $key = str_pad($key, 64, chr(0));
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94 }
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95
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96 $k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
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97 $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);
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98
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99 $inner = pack('H40', sha1($k_ipad . $data));
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100 $digest = sha1($k_opad . $inner, $raw_output);
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101
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102 return $digest;
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103 }
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104 }
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105 ?>
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