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1 <?php
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2
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3 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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4
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5 /**
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6 * Contains a class representing GPG sub-keys and constants for GPG algorithms
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7 *
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8 * PHP version 5
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9 *
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10 * LICENSE:
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11 *
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12 * This library is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU Lesser General Public License as
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14 * published by the Free Software Foundation; either version 2.1 of the
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15 * License, or (at your option) any later version.
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16 *
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17 * This library is distributed in the hope that it will be useful,
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18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 * Lesser General Public License for more details.
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21 *
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22 * You should have received a copy of the GNU Lesser General Public
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23 * License along with this library; if not, see
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24 * <http://www.gnu.org/licenses/>
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25 *
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26 * @category Encryption
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27 * @package Crypt_GPG
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28 * @author Michael Gauthier <mike@silverorange.com>
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29 * @author Nathan Fredrickson <nathan@silverorange.com>
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30 * @copyright 2005-2010 silverorange
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31 * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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32 * @link http://pear.php.net/package/Crypt_GPG
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33 */
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34
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35 // {{{ class Crypt_GPG_SubKey
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36
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37 /**
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38 * A class for GPG sub-key information
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39 *
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40 * This class is used to store the results of the {@link Crypt_GPG::getKeys()}
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41 * method. Sub-key objects are members of a {@link Crypt_GPG_Key} object.
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42 *
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43 * @category Encryption
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44 * @package Crypt_GPG
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45 * @author Michael Gauthier <mike@silverorange.com>
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46 * @author Nathan Fredrickson <nathan@silverorange.com>
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47 * @copyright 2005-2010 silverorange
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48 * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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49 * @link http://pear.php.net/package/Crypt_GPG
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50 * @see Crypt_GPG::getKeys()
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51 * @see Crypt_GPG_Key::getSubKeys()
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52 */
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53 class Crypt_GPG_SubKey
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54 {
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55 // {{{ algorithm class constants
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56
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57 /**
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58 * RSA encryption algorithm.
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59 */
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60 const ALGORITHM_RSA = 1;
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61
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62 /**
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63 * Elgamal encryption algorithm (encryption only).
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64 */
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65 const ALGORITHM_ELGAMAL_ENC = 16;
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66
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67 /**
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68 * DSA encryption algorithm (sometimes called DH, sign only).
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69 */
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70 const ALGORITHM_DSA = 17;
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71
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72 /**
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73 * Elgamal encryption algorithm (signage and encryption - should not be
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74 * used).
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75 */
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76 const ALGORITHM_ELGAMAL_ENC_SGN = 20;
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77
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78 // }}}
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79 // {{{ usage class constants
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80
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81 /**
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82 * Key can be used to encrypt
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83 */
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84 const USAGE_ENCRYPT = 1;
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85
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86 /**
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87 * Key can be used to sign
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88 */
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89 const USAGE_SIGN = 2;
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90
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91 /**
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92 * Key can be used to certify other keys
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93 */
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94 const USAGE_CERTIFY = 4;
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95
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96 /**
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97 * Key can be used for authentication
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98 */
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99 const USAGE_AUTHENTICATION = 8;
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100
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101 // }}}
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102 // {{{ class properties
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103
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104 /**
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105 * The id of this sub-key
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106 *
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107 * @var string
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108 */
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109 private $_id = '';
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110
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111 /**
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112 * The algorithm used to create this sub-key
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113 *
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114 * The value is one of the Crypt_GPG_SubKey::ALGORITHM_* constants.
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115 *
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116 * @var integer
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117 */
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118 private $_algorithm = 0;
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119
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120 /**
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121 * The fingerprint of this sub-key
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122 *
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123 * @var string
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124 */
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125 private $_fingerprint = '';
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126
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127 /**
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128 * Length of this sub-key in bits
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129 *
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130 * @var integer
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131 */
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132 private $_length = 0;
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133
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134 /**
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135 * Date this sub-key was created
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136 *
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137 * This is a Unix timestamp.
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138 *
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139 * @var integer
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140 */
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141 private $_creationDate = 0;
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142
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143 /**
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144 * Date this sub-key expires
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145 *
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146 * This is a Unix timestamp. If this sub-key does not expire, this will be
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147 * zero.
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148 *
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149 * @var integer
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150 */
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151 private $_expirationDate = 0;
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152
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153 /**
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154 * Contains usage flags of this sub-key
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155 *
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156 * @var int
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157 */
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158 private $_usage = 0;
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159
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160 /**
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161 * Whether or not the private key for this sub-key exists in the keyring
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162 *
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163 * @var boolean
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164 */
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165 private $_hasPrivate = false;
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166
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167 /**
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168 * Whether or not this sub-key is revoked
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169 *
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170 * @var boolean
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171 */
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172 private $_isRevoked = false;
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173
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174 // }}}
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175 // {{{ __construct()
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176
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177 /**
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178 * Creates a new sub-key object
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179 *
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180 * Sub-keys can be initialized from an array of named values. Available
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181 * names are:
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182 *
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183 * - <kbd>string id</kbd> - the key id of the sub-key.
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184 * - <kbd>integer algorithm</kbd> - the encryption algorithm of the
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185 * sub-key.
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186 * - <kbd>string fingerprint</kbd> - the fingerprint of the sub-key. The
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187 * fingerprint should not contain
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188 * formatting characters.
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189 * - <kbd>integer length</kbd> - the length of the sub-key in bits.
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190 * - <kbd>integer creation</kbd> - the date the sub-key was created.
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191 * This is a UNIX timestamp.
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192 * - <kbd>integer expiration</kbd> - the date the sub-key expires. This
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193 * is a UNIX timestamp. If the sub-key
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194 * does not expire, use 0.
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195 * - <kbd>boolean canSign</kbd> - whether or not the sub-key can be
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196 * used to sign data.
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197 * - <kbd>boolean canEncrypt</kbd> - whether or not the sub-key can be
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198 * used to encrypt data.
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199 * - <kbd>integer usage</kbd> - the sub-key usage flags
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200 * - <kbd>boolean hasPrivate</kbd> - whether or not the private key for
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201 * the sub-key exists in the keyring.
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202 * - <kbd>boolean isRevoked</kbd> - whether or not this sub-key is
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203 * revoked.
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204 *
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205 * @param Crypt_GPG_SubKey|string|array $key optional. Either an existing
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206 * sub-key object, which is copied; a sub-key string, which is
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207 * parsed; or an array of initial values.
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208 */
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209 public function __construct($key = null)
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210 {
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211 // parse from string
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212 if (is_string($key)) {
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213 $key = self::parse($key);
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214 }
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215
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216 // copy from object
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217 if ($key instanceof Crypt_GPG_SubKey) {
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218 $this->_id = $key->_id;
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219 $this->_algorithm = $key->_algorithm;
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220 $this->_fingerprint = $key->_fingerprint;
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221 $this->_length = $key->_length;
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222 $this->_creationDate = $key->_creationDate;
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223 $this->_expirationDate = $key->_expirationDate;
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224 $this->_usage = $key->_usage;
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225 $this->_hasPrivate = $key->_hasPrivate;
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226 $this->_isRevoked = $key->_isRevoked;
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227 }
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228
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229 // initialize from array
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230 if (is_array($key)) {
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231 if (array_key_exists('id', $key)) {
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232 $this->setId($key['id']);
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233 }
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234
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235 if (array_key_exists('algorithm', $key)) {
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236 $this->setAlgorithm($key['algorithm']);
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237 }
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238
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239 if (array_key_exists('fingerprint', $key)) {
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240 $this->setFingerprint($key['fingerprint']);
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241 }
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242
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243 if (array_key_exists('length', $key)) {
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244 $this->setLength($key['length']);
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245 }
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246
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247 if (array_key_exists('creation', $key)) {
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248 $this->setCreationDate($key['creation']);
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249 }
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250
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251 if (array_key_exists('expiration', $key)) {
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252 $this->setExpirationDate($key['expiration']);
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253 }
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254
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255 if (array_key_exists('usage', $key)) {
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256 $this->setUsage($key['usage']);
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257 }
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258
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259 if (array_key_exists('canSign', $key)) {
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260 $this->setCanSign($key['canSign']);
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261 }
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262
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263 if (array_key_exists('canEncrypt', $key)) {
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264 $this->setCanEncrypt($key['canEncrypt']);
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265 }
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266
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267 if (array_key_exists('hasPrivate', $key)) {
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268 $this->setHasPrivate($key['hasPrivate']);
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269 }
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270
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271 if (array_key_exists('isRevoked', $key)) {
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272 $this->setRevoked($key['isRevoked']);
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273 }
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274 }
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275 }
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276
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277 // }}}
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278 // {{{ getId()
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279
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280 /**
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281 * Gets the id of this sub-key
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282 *
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283 * @return string the id of this sub-key.
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284 */
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285 public function getId()
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286 {
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287 return $this->_id;
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288 }
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289
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290 // }}}
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291 // {{{ getAlgorithm()
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292
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293 /**
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294 * Gets the algorithm used by this sub-key
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295 *
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296 * The algorithm should be one of the Crypt_GPG_SubKey::ALGORITHM_*
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297 * constants.
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298 *
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299 * @return integer the algorithm used by this sub-key.
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300 */
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301 public function getAlgorithm()
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302 {
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303 return $this->_algorithm;
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304 }
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305
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306 // }}}
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307 // {{{ getCreationDate()
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308
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309 /**
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310 * Gets the creation date of this sub-key
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311 *
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312 * This is a Unix timestamp.
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313 *
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314 * @return integer the creation date of this sub-key.
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315 */
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316 public function getCreationDate()
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317 {
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318 return $this->_creationDate;
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319 }
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320
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321 // }}}
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322 // {{{ getExpirationDate()
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323
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324 /**
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325 * Gets the date this sub-key expires
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326 *
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327 * This is a Unix timestamp. If this sub-key does not expire, this will be
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328 * zero.
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329 *
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330 * @return integer the date this sub-key expires.
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331 */
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332 public function getExpirationDate()
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333 {
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334 return $this->_expirationDate;
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335 }
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336
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337 // }}}
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338 // {{{ getFingerprint()
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339
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340 /**
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341 * Gets the fingerprint of this sub-key
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342 *
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343 * @return string the fingerprint of this sub-key.
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344 */
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345 public function getFingerprint()
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346 {
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347 return $this->_fingerprint;
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348 }
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349
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350 // }}}
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351 // {{{ getLength()
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352
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353 /**
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354 * Gets the length of this sub-key in bits
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355 *
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356 * @return integer the length of this sub-key in bits.
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357 */
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358 public function getLength()
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359 {
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360 return $this->_length;
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361 }
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362
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363 // }}}
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364 // {{{ canSign()
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365
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366 /**
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367 * Gets whether or not this sub-key can sign data
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368 *
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369 * @return boolean true if this sub-key can sign data and false if this
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370 * sub-key can not sign data.
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371 */
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372 public function canSign()
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373 {
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374 return ($this->_usage & self::USAGE_SIGN) != 0;
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375 }
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376
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377 // }}}
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378 // {{{ canEncrypt()
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379
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380 /**
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381 * Gets whether or not this sub-key can encrypt data
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382 *
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383 * @return boolean true if this sub-key can encrypt data and false if this
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384 * sub-key can not encrypt data.
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385 */
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386 public function canEncrypt()
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387 {
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388 return ($this->_usage & self::USAGE_ENCRYPT) != 0;
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389 }
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390
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391 // }}}
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392 // {{{ usage()
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393
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394 /**
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395 * Gets usage flags of this sub-key
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396 *
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397 * @return int Sum of usage flags
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398 */
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399 public function usage()
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400 {
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401 return $this->_usage;
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402 }
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403
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404 // }}}
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405 // {{{ hasPrivate()
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406
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407 /**
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408 * Gets whether or not the private key for this sub-key exists in the
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409 * keyring
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410 *
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411 * @return boolean true the private key for this sub-key exists in the
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412 * keyring and false if it does not.
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413 */
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414 public function hasPrivate()
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415 {
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416 return $this->_hasPrivate;
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417 }
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418
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419 // }}}
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420 // {{{ isRevoked()
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421
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422 /**
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423 * Gets whether or not this sub-key is revoked
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424 *
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425 * @return boolean true if this sub-key is revoked and false if it is not.
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426 */
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427 public function isRevoked()
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428 {
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429 return $this->_isRevoked;
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430 }
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431
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432 // }}}
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433 // {{{ setCreationDate()
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434
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435 /**
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436 * Sets the creation date of this sub-key
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437 *
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438 * The creation date is a Unix timestamp.
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439 *
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440 * @param integer $creationDate the creation date of this sub-key.
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441 *
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442 * @return Crypt_GPG_SubKey the current object, for fluent interface.
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443 */
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444 public function setCreationDate($creationDate)
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445 {
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446 $this->_creationDate = intval($creationDate);
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447 return $this;
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448 }
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449
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450 // }}}
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451 // {{{ setExpirationDate()
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452
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453 /**
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454 * Sets the expiration date of this sub-key
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455 *
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456 * The expiration date is a Unix timestamp. Specify zero if this sub-key
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457 * does not expire.
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458 *
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459 * @param integer $expirationDate the expiration date of this sub-key.
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460 *
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461 * @return Crypt_GPG_SubKey the current object, for fluent interface.
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|
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462 */
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|
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463 public function setExpirationDate($expirationDate)
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464 {
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465 $this->_expirationDate = intval($expirationDate);
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466 return $this;
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467 }
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468
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469 // }}}
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470 // {{{ setId()
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471
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472 /**
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473 * Sets the id of this sub-key
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474 *
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475 * @param string $id the id of this sub-key.
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476 *
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477 * @return Crypt_GPG_SubKey the current object, for fluent interface.
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478 */
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479 public function setId($id)
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480 {
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481 $this->_id = strval($id);
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482 return $this;
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483 }
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484
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485 // }}}
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486 // {{{ setAlgorithm()
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487
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488 /**
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489 * Sets the algorithm used by this sub-key
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490 *
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491 * @param integer $algorithm the algorithm used by this sub-key.
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492 *
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493 * @return Crypt_GPG_SubKey the current object, for fluent interface.
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494 */
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495 public function setAlgorithm($algorithm)
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496 {
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497 $this->_algorithm = intval($algorithm);
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498 return $this;
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499 }
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500
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501 // }}}
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502 // {{{ setFingerprint()
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503
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504 /**
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505 * Sets the fingerprint of this sub-key
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506 *
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507 * @param string $fingerprint the fingerprint of this sub-key.
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508 *
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509 * @return Crypt_GPG_SubKey the current object, for fluent interface.
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|
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510 */
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|
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511 public function setFingerprint($fingerprint)
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512 {
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513 $this->_fingerprint = strval($fingerprint);
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514 return $this;
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515 }
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516
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517 // }}}
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518 // {{{ setLength()
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519
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520 /**
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521 * Sets the length of this sub-key in bits
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|
|
522 *
|
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523 * @param integer $length the length of this sub-key in bits.
|
|
|
524 *
|
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|
525 * @return Crypt_GPG_SubKey the current object, for fluent interface.
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|
|
526 */
|
|
|
527 public function setLength($length)
|
|
|
528 {
|
|
|
529 $this->_length = intval($length);
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|
|
530 return $this;
|
|
|
531 }
|
|
|
532
|
|
|
533 // }}}
|
|
|
534 // {{{ setCanSign()
|
|
|
535
|
|
|
536 /**
|
|
|
537 * Sets whether or not this sub-key can sign data
|
|
|
538 *
|
|
|
539 * @param boolean $canSign true if this sub-key can sign data and false if
|
|
|
540 * it can not.
|
|
|
541 *
|
|
|
542 * @return Crypt_GPG_SubKey the current object, for fluent interface.
|
|
|
543 */
|
|
|
544 public function setCanSign($canSign)
|
|
|
545 {
|
|
|
546 if ($canSign) {
|
|
|
547 $this->_usage |= self::USAGE_SIGN;
|
|
|
548 } else {
|
|
|
549 $this->_usage &= ~self::USAGE_SIGN;
|
|
|
550 }
|
|
|
551
|
|
|
552 return $this;
|
|
|
553 }
|
|
|
554
|
|
|
555 // }}}
|
|
|
556 // {{{ setCanEncrypt()
|
|
|
557
|
|
|
558 /**
|
|
|
559 * Sets whether or not this sub-key can encrypt data
|
|
|
560 *
|
|
|
561 * @param boolean $canEncrypt true if this sub-key can encrypt data and
|
|
|
562 * false if it can not.
|
|
|
563 *
|
|
|
564 * @return Crypt_GPG_SubKey the current object, for fluent interface.
|
|
|
565 */
|
|
|
566 public function setCanEncrypt($canEncrypt)
|
|
|
567 {
|
|
|
568 if ($canEncrypt) {
|
|
|
569 $this->_usage |= self::USAGE_ENCRYPT;
|
|
|
570 } else {
|
|
|
571 $this->_usage &= ~self::USAGE_ENCRYPT;
|
|
|
572 }
|
|
|
573
|
|
|
574 return $this;
|
|
|
575 }
|
|
|
576
|
|
|
577 // }}}
|
|
|
578 // {{{ setUsage()
|
|
|
579
|
|
|
580 /**
|
|
|
581 * Sets usage flags of the sub-key
|
|
|
582 *
|
|
|
583 * @param integer $usage Usage flags
|
|
|
584 *
|
|
|
585 * @return Crypt_GPG_SubKey the current object, for fluent interface.
|
|
|
586 */
|
|
|
587 public function setUsage($usage)
|
|
|
588 {
|
|
|
589 $this->_usage = (int) $usage;
|
|
|
590 return $this;
|
|
|
591 }
|
|
|
592
|
|
|
593 // }}}
|
|
|
594 // {{{ setHasPrivate()
|
|
|
595
|
|
|
596 /**
|
|
|
597 * Sets whether of not the private key for this sub-key exists in the
|
|
|
598 * keyring
|
|
|
599 *
|
|
|
600 * @param boolean $hasPrivate true if the private key for this sub-key
|
|
|
601 * exists in the keyring and false if it does
|
|
|
602 * not.
|
|
|
603 *
|
|
|
604 * @return Crypt_GPG_SubKey the current object, for fluent interface.
|
|
|
605 */
|
|
|
606 public function setHasPrivate($hasPrivate)
|
|
|
607 {
|
|
|
608 $this->_hasPrivate = ($hasPrivate) ? true : false;
|
|
|
609 return $this;
|
|
|
610 }
|
|
|
611
|
|
|
612 // }}}
|
|
|
613 // {{{ setRevoked()
|
|
|
614
|
|
|
615 /**
|
|
|
616 * Sets whether or not this sub-key is revoked
|
|
|
617 *
|
|
|
618 * @param boolean $isRevoked whether or not this sub-key is revoked.
|
|
|
619 *
|
|
|
620 * @return Crypt_GPG_SubKey the current object, for fluent interface.
|
|
|
621 */
|
|
|
622 public function setRevoked($isRevoked)
|
|
|
623 {
|
|
|
624 $this->_isRevoked = ($isRevoked) ? true : false;
|
|
|
625 return $this;
|
|
|
626 }
|
|
|
627
|
|
|
628 // }}}
|
|
|
629 // {{{ parse()
|
|
|
630
|
|
|
631 /**
|
|
|
632 * Parses a sub-key object from a sub-key string
|
|
|
633 *
|
|
|
634 * See <b>doc/DETAILS</b> in the
|
|
|
635 * {@link http://www.gnupg.org/download/ GPG distribution} for information
|
|
|
636 * on how the sub-key string is parsed.
|
|
|
637 *
|
|
|
638 * @param string $string the string containing the sub-key.
|
|
|
639 *
|
|
|
640 * @return Crypt_GPG_SubKey the sub-key object parsed from the string.
|
|
|
641 */
|
|
|
642 public static function parse($string)
|
|
|
643 {
|
|
|
644 $tokens = explode(':', $string);
|
|
|
645
|
|
|
646 $subKey = new Crypt_GPG_SubKey();
|
|
|
647
|
|
|
648 $subKey->setId($tokens[4]);
|
|
|
649 $subKey->setLength($tokens[2]);
|
|
|
650 $subKey->setAlgorithm($tokens[3]);
|
|
|
651 $subKey->setCreationDate(self::_parseDate($tokens[5]));
|
|
|
652 $subKey->setExpirationDate(self::_parseDate($tokens[6]));
|
|
|
653
|
|
|
654 if ($tokens[1] == 'r') {
|
|
|
655 $subKey->setRevoked(true);
|
|
|
656 }
|
|
|
657
|
|
|
658 $usage = 0;
|
|
|
659 $usage_map = array(
|
|
|
660 'a' => self::USAGE_AUTHENTICATION,
|
|
|
661 'c' => self::USAGE_CERTIFY,
|
|
|
662 'e' => self::USAGE_ENCRYPT,
|
|
|
663 's' => self::USAGE_SIGN,
|
|
|
664 );
|
|
|
665
|
|
|
666 foreach ($usage_map as $key => $flag) {
|
|
|
667 if (strpos($tokens[11], $key) !== false) {
|
|
|
668 $usage |= $flag;
|
|
|
669 }
|
|
|
670 }
|
|
|
671
|
|
|
672 $subKey->setUsage($usage);
|
|
|
673
|
|
|
674 return $subKey;
|
|
|
675 }
|
|
|
676
|
|
|
677 // }}}
|
|
|
678 // {{{ _parseDate()
|
|
|
679
|
|
|
680 /**
|
|
|
681 * Parses a date string as provided by GPG into a UNIX timestamp
|
|
|
682 *
|
|
|
683 * @param string $string the date string.
|
|
|
684 *
|
|
|
685 * @return integer the UNIX timestamp corresponding to the provided date
|
|
|
686 * string.
|
|
|
687 */
|
|
|
688 private static function _parseDate($string)
|
|
|
689 {
|
|
|
690 if ($string == '') {
|
|
|
691 $timestamp = 0;
|
|
|
692 } else {
|
|
|
693 // all times are in UTC according to GPG documentation
|
|
|
694 $timeZone = new DateTimeZone('UTC');
|
|
|
695
|
|
|
696 if (strpos($string, 'T') === false) {
|
|
|
697 // interpret as UNIX timestamp
|
|
|
698 $string = '@' . $string;
|
|
|
699 }
|
|
|
700
|
|
|
701 $date = new DateTime($string, $timeZone);
|
|
|
702
|
|
|
703 // convert to UNIX timestamp
|
|
|
704 $timestamp = intval($date->format('U'));
|
|
|
705 }
|
|
|
706
|
|
|
707 return $timestamp;
|
|
|
708 }
|
|
|
709
|
|
|
710 // }}}
|
|
|
711 }
|
|
|
712
|
|
|
713 // }}}
|
|
|
714
|
|
|
715 ?>
|
