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1 <?php |
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2 /** |
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3 * Portable PHP password hashing framework. |
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4 * @package phpass |
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5 * @since 2.5 |
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6 * @version 0.1 |
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7 * @link http://www.openwall.com/phpass/ |
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8 */ |
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9 |
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10 # |
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11 # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in |
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12 # the public domain. |
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13 # |
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14 # There's absolutely no warranty. |
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15 # |
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16 # Please be sure to update the Version line if you edit this file in any way. |
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17 # It is suggested that you leave the main version number intact, but indicate |
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18 # your project name (after the slash) and add your own revision information. |
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19 # |
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20 # Please do not change the "private" password hashing method implemented in |
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21 # here, thereby making your hashes incompatible. However, if you must, please |
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22 # change the hash type identifier (the "$P$") to something different. |
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23 # |
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24 # Obviously, since this code is in the public domain, the above are not |
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25 # requirements (there can be none), but merely suggestions. |
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26 # |
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27 |
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28 /** |
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29 * Portable PHP password hashing framework. |
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30 * |
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31 * @package phpass |
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32 * @version 0.1 / genuine |
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33 * @link http://www.openwall.com/phpass/ |
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34 * @since 2.5 |
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35 */ |
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36 class PasswordHash { |
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37 var $itoa64; |
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38 var $iteration_count_log2; |
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39 var $portable_hashes; |
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40 var $random_state; |
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41 |
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42 function PasswordHash($iteration_count_log2, $portable_hashes) |
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43 { |
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44 $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; |
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45 |
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46 if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) |
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47 $iteration_count_log2 = 8; |
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48 $this->iteration_count_log2 = $iteration_count_log2; |
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49 |
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50 $this->portable_hashes = $portable_hashes; |
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51 |
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52 $this->random_state = microtime() . (function_exists('getmypid') ? getmypid() : '') . uniqid(rand(), TRUE); |
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53 |
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54 } |
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55 |
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56 function get_random_bytes($count) |
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57 { |
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58 $output = ''; |
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59 if (($fh = @fopen('/dev/urandom', 'rb'))) { |
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60 $output = fread($fh, $count); |
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61 fclose($fh); |
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62 } |
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63 |
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64 if (strlen($output) < $count) { |
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65 $output = ''; |
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66 for ($i = 0; $i < $count; $i += 16) { |
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67 $this->random_state = |
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68 md5(microtime() . $this->random_state); |
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69 $output .= |
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70 pack('H*', md5($this->random_state)); |
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71 } |
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72 $output = substr($output, 0, $count); |
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73 } |
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74 |
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75 return $output; |
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76 } |
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77 |
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78 function encode64($input, $count) |
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79 { |
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80 $output = ''; |
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81 $i = 0; |
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82 do { |
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83 $value = ord($input[$i++]); |
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84 $output .= $this->itoa64[$value & 0x3f]; |
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85 if ($i < $count) |
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86 $value |= ord($input[$i]) << 8; |
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87 $output .= $this->itoa64[($value >> 6) & 0x3f]; |
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88 if ($i++ >= $count) |
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89 break; |
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90 if ($i < $count) |
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91 $value |= ord($input[$i]) << 16; |
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92 $output .= $this->itoa64[($value >> 12) & 0x3f]; |
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93 if ($i++ >= $count) |
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94 break; |
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95 $output .= $this->itoa64[($value >> 18) & 0x3f]; |
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96 } while ($i < $count); |
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97 |
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98 return $output; |
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99 } |
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100 |
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101 function gensalt_private($input) |
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102 { |
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103 $output = '$P$'; |
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104 $output .= $this->itoa64[min($this->iteration_count_log2 + |
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105 ((PHP_VERSION >= '5') ? 5 : 3), 30)]; |
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106 $output .= $this->encode64($input, 6); |
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107 |
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108 return $output; |
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109 } |
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110 |
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111 function crypt_private($password, $setting) |
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112 { |
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113 $output = '*0'; |
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114 if (substr($setting, 0, 2) == $output) |
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115 $output = '*1'; |
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116 |
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117 if (substr($setting, 0, 3) != '$P$') |
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118 return $output; |
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119 |
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120 $count_log2 = strpos($this->itoa64, $setting[3]); |
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121 if ($count_log2 < 7 || $count_log2 > 30) |
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122 return $output; |
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123 |
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124 $count = 1 << $count_log2; |
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125 |
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126 $salt = substr($setting, 4, 8); |
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127 if (strlen($salt) != 8) |
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128 return $output; |
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129 |
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130 # We're kind of forced to use MD5 here since it's the only |
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131 # cryptographic primitive available in all versions of PHP |
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132 # currently in use. To implement our own low-level crypto |
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133 # in PHP would result in much worse performance and |
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134 # consequently in lower iteration counts and hashes that are |
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135 # quicker to crack (by non-PHP code). |
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136 if (PHP_VERSION >= '5') { |
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137 $hash = md5($salt . $password, TRUE); |
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138 do { |
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139 $hash = md5($hash . $password, TRUE); |
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140 } while (--$count); |
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141 } else { |
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142 $hash = pack('H*', md5($salt . $password)); |
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143 do { |
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144 $hash = pack('H*', md5($hash . $password)); |
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145 } while (--$count); |
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146 } |
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147 |
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148 $output = substr($setting, 0, 12); |
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149 $output .= $this->encode64($hash, 16); |
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150 |
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151 return $output; |
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152 } |
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153 |
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154 function gensalt_extended($input) |
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155 { |
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156 $count_log2 = min($this->iteration_count_log2 + 8, 24); |
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157 # This should be odd to not reveal weak DES keys, and the |
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158 # maximum valid value is (2**24 - 1) which is odd anyway. |
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159 $count = (1 << $count_log2) - 1; |
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160 |
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161 $output = '_'; |
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162 $output .= $this->itoa64[$count & 0x3f]; |
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163 $output .= $this->itoa64[($count >> 6) & 0x3f]; |
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164 $output .= $this->itoa64[($count >> 12) & 0x3f]; |
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165 $output .= $this->itoa64[($count >> 18) & 0x3f]; |
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166 |
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167 $output .= $this->encode64($input, 3); |
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168 |
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169 return $output; |
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170 } |
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171 |
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172 function gensalt_blowfish($input) |
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173 { |
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174 # This one needs to use a different order of characters and a |
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175 # different encoding scheme from the one in encode64() above. |
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176 # We care because the last character in our encoded string will |
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177 # only represent 2 bits. While two known implementations of |
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178 # bcrypt will happily accept and correct a salt string which |
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179 # has the 4 unused bits set to non-zero, we do not want to take |
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180 # chances and we also do not want to waste an additional byte |
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181 # of entropy. |
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182 $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; |
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183 |
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184 $output = '$2a$'; |
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185 $output .= chr(ord('0') + $this->iteration_count_log2 / 10); |
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186 $output .= chr(ord('0') + $this->iteration_count_log2 % 10); |
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187 $output .= '$'; |
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188 |
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189 $i = 0; |
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190 do { |
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191 $c1 = ord($input[$i++]); |
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192 $output .= $itoa64[$c1 >> 2]; |
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193 $c1 = ($c1 & 0x03) << 4; |
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194 if ($i >= 16) { |
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195 $output .= $itoa64[$c1]; |
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196 break; |
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197 } |
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198 |
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199 $c2 = ord($input[$i++]); |
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200 $c1 |= $c2 >> 4; |
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201 $output .= $itoa64[$c1]; |
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202 $c1 = ($c2 & 0x0f) << 2; |
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203 |
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204 $c2 = ord($input[$i++]); |
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205 $c1 |= $c2 >> 6; |
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206 $output .= $itoa64[$c1]; |
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207 $output .= $itoa64[$c2 & 0x3f]; |
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208 } while (1); |
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209 |
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210 return $output; |
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211 } |
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212 |
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213 function HashPassword($password) |
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214 { |
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215 $random = ''; |
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216 |
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217 if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) { |
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218 $random = $this->get_random_bytes(16); |
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219 $hash = |
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220 crypt($password, $this->gensalt_blowfish($random)); |
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221 if (strlen($hash) == 60) |
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222 return $hash; |
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223 } |
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224 |
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225 if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) { |
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226 if (strlen($random) < 3) |
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227 $random = $this->get_random_bytes(3); |
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228 $hash = |
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229 crypt($password, $this->gensalt_extended($random)); |
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230 if (strlen($hash) == 20) |
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231 return $hash; |
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232 } |
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233 |
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234 if (strlen($random) < 6) |
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235 $random = $this->get_random_bytes(6); |
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236 $hash = |
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237 $this->crypt_private($password, |
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238 $this->gensalt_private($random)); |
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239 if (strlen($hash) == 34) |
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240 return $hash; |
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241 |
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242 # Returning '*' on error is safe here, but would _not_ be safe |
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243 # in a crypt(3)-like function used _both_ for generating new |
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244 # hashes and for validating passwords against existing hashes. |
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245 return '*'; |
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246 } |
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247 |
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248 function CheckPassword($password, $stored_hash) |
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249 { |
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250 $hash = $this->crypt_private($password, $stored_hash); |
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251 if ($hash[0] == '*') |
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252 $hash = crypt($password, $stored_hash); |
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253 |
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254 return $hash == $stored_hash; |
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255 } |
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256 } |
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257 |
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258 ?> |