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| 1 | <?php |
| 2 | |
| 3 | namespace NewfoldLabs\WP\Module\Data\Helpers; |
| 4 | |
| 5 | /** |
| 6 | * Encrypt/Decrypt strings for database storage |
| 7 | */ |
| 8 | class Encryption { |
| 9 | |
| 10 | /** |
| 11 | * Key to use for encrypting/decrypting |
| 12 | * |
| 13 | * @since 1.0 |
| 14 | * @var string |
| 15 | */ |
| 16 | private $key; |
| 17 | |
| 18 | /** |
| 19 | * Salt to use prior to encryption |
| 20 | * |
| 21 | * @since 1.0 |
| 22 | * @var string |
| 23 | */ |
| 24 | private $salt; |
| 25 | |
| 26 | /** |
| 27 | * Method to be used for encrypting |
| 28 | * |
| 29 | * @since 1.0 |
| 30 | * @var string |
| 31 | */ |
| 32 | private $method; |
| 33 | |
| 34 | /** |
| 35 | * The initialization vector length based on the method |
| 36 | * |
| 37 | * @since 1.0 |
| 38 | * @var string |
| 39 | */ |
| 40 | private $ivlength; |
| 41 | |
| 42 | /** |
| 43 | * Construct |
| 44 | * |
| 45 | * @since 1.0 |
| 46 | */ |
| 47 | public function __construct() { |
| 48 | $this->key = $this->get_key(); |
| 49 | $this->salt = $this->get_salt(); |
| 50 | $this->method = 'aes-256-ctr'; |
| 51 | $this->ivlength = openssl_cipher_iv_length( $this->method ); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns the encryption key to use |
| 56 | * |
| 57 | * @since 1.0 |
| 58 | * |
| 59 | * @return string The encryption key |
| 60 | */ |
| 61 | private function get_key() { |
| 62 | if ( defined( 'LOGGED_IN_KEY' ) && '' !== LOGGED_IN_KEY ) { |
| 63 | return LOGGED_IN_KEY; |
| 64 | } |
| 65 | |
| 66 | // If a site does not have a LOGGED_IN_KEY set, then they already have more |
| 67 | // pressing security issues than exposure of the data connection token. |
| 68 | // We'll set a basic fallback just in case. |
| 69 | return 'DB6F4B11FF31F37F3C53D6FDD13A12F06D2802DA'; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Returns the salt to use before encryption |
| 74 | * |
| 75 | * @since 1.0 |
| 76 | * |
| 77 | * @return string The salt |
| 78 | */ |
| 79 | private function get_salt() { |
| 80 | if ( defined( 'LOGGED_IN_SALT' ) && '' !== LOGGED_IN_SALT ) { |
| 81 | return LOGGED_IN_SALT; |
| 82 | } |
| 83 | |
| 84 | // If a site does not have a LOGGED_IN_SALT set, then they already have more |
| 85 | // pressing security issues than exposure of the data connection token. |
| 86 | // We'll set a basic fallback just in case. |
| 87 | return 'EE3440AA014D3E0627127D844EFAE7946B51BFBB'; |
| 88 | } |
| 89 | |
| 90 | |
| 91 | /** |
| 92 | * Encrypts a value |
| 93 | * |
| 94 | * @since 1.0 |
| 95 | * |
| 96 | * @param string $value The string to be encrypted |
| 97 | * |
| 98 | * @return string|False The encrypted value, or false on failure |
| 99 | */ |
| 100 | public function encrypt( $value ) { |
| 101 | |
| 102 | // If we don't have openssl for some reason, we'll just bail and return the value |
| 103 | if ( ! extension_loaded( 'openssl' ) ) { |
| 104 | return $value; |
| 105 | } |
| 106 | |
| 107 | $salty_value = $value . $this->salt; |
| 108 | $iv = openssl_random_pseudo_bytes( $this->ivlength ); |
| 109 | |
| 110 | $cipher = openssl_encrypt( $salty_value, $this->method, $this->key, 0, $iv ); |
| 111 | |
| 112 | // If encryption failed |
| 113 | if ( ! $cipher ) { |
| 114 | return false; |
| 115 | } |
| 116 | |
| 117 | return base64_encode( $iv . $cipher ); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Decrypts a value |
| 122 | * |
| 123 | * @since 1.0 |
| 124 | * |
| 125 | * @param string $cipher The value to be decrypted |
| 126 | * |
| 127 | * @return string|False The decrypted value or false on failure |
| 128 | */ |
| 129 | public function decrypt( $cipher ) { |
| 130 | |
| 131 | // If we don't have openssl for some reason, we'll just bail and return the value |
| 132 | if ( ! extension_loaded( 'openssl' ) ) { |
| 133 | return $cipher; |
| 134 | } |
| 135 | |
| 136 | $cipher = base64_decode( $cipher, true ); |
| 137 | |
| 138 | // Grab the IV from the front of the passed encrypted string |
| 139 | $iv = substr( $cipher, 0, $this->ivlength ); |
| 140 | |
| 141 | // Get the encrypted value from the second half |
| 142 | $value = substr( $cipher, $this->ivlength ); |
| 143 | |
| 144 | // Decrypt! |
| 145 | $decrypted_value = openssl_decrypt( $value, $this->method, $this->key, 0, $iv ); |
| 146 | |
| 147 | // Decription failed, or the salt doesn't match the end of the decrypted string |
| 148 | if ( ! $value || substr( $decrypted_value, - strlen( $this->salt ) ) !== $this->salt ) { |
| 149 | return false; |
| 150 | } |
| 151 | |
| 152 | // Remove the salt from the end and return the decypted value |
| 153 | return substr( $decrypted_value, 0, - strlen( $this->salt ) ); |
| 154 | } |
| 155 | } |