Authentication.php
4 years ago
BackupCodes.php
4 years ago
Login.php
4 years ago
class-open-ssl.php
4 years ago
index.php
5 years ago
class-open-ssl.php
128 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Open SSL encrypt / decrypt class. |
| 4 | * |
| 5 | * @package wp2fa |
| 6 | * @copyright 2021 WP White Security |
| 7 | * @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0 |
| 8 | * @link https://wordpress.org/plugins/wp-2fa/ |
| 9 | */ |
| 10 | |
| 11 | namespace WP2FA\Authenticator; |
| 12 | |
| 13 | use WP2FA\WP2FA; |
| 14 | use WP2FA\Utils\Debugging; |
| 15 | |
| 16 | /** |
| 17 | * Open_SSL - Class for encryption and decryption of the string using open_ssl method |
| 18 | * |
| 19 | * @since 2.0.0 |
| 20 | */ |
| 21 | class Open_SSL { |
| 22 | |
| 23 | const CIPHER_METHOD = 'aes-256-ctr'; |
| 24 | const BLOCK_BYTE_SIZE = 16; |
| 25 | const DIGEST_ALGORITHM = 'SHA256'; |
| 26 | |
| 27 | /** |
| 28 | * Internal cache var for the PHP ssl functions availability |
| 29 | * |
| 30 | * @var mixed|boolean |
| 31 | * |
| 32 | * @since 2.0.0 |
| 33 | */ |
| 34 | private static $ssl_enabled = null; |
| 35 | |
| 36 | /** |
| 37 | * Encrypts given text |
| 38 | * |
| 39 | * @param string $text - Text to be encrypted. |
| 40 | * |
| 41 | * @return string |
| 42 | * |
| 43 | * @since 2.0.0 |
| 44 | */ |
| 45 | public static function encrypt( string $text ): string { |
| 46 | Debugging::log( 'Encrypting a text: '. $text ); |
| 47 | if ( self::is_ssl_available() ) { |
| 48 | $iv = self::secure_random( self::BLOCK_BYTE_SIZE ); |
| 49 | $key = \openssl_digest( \base64_decode( WP2FA::get_secret_key() ), self::DIGEST_ALGORITHM, true ); |
| 50 | $text = \openssl_encrypt( |
| 51 | $text, |
| 52 | self::CIPHER_METHOD, |
| 53 | $key, |
| 54 | OPENSSL_RAW_DATA, |
| 55 | $iv |
| 56 | ); |
| 57 | |
| 58 | $text = \base64_encode( $iv . $text ); |
| 59 | } |
| 60 | Debugging::log( 'Encrypted text: '. $text ); |
| 61 | |
| 62 | return $text; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Decrypts crypt text |
| 67 | * |
| 68 | * @param string $text - Encrypted text to be decrypted. |
| 69 | * |
| 70 | * @return string |
| 71 | * |
| 72 | * @since 2.0.0 |
| 73 | */ |
| 74 | public static function decrypt( string $text ): string { |
| 75 | Debugging::log( 'Decrypting a text: '. $text ); |
| 76 | |
| 77 | if ( self::is_ssl_available() ) { |
| 78 | $decoded_base = \base64_decode( $text ); |
| 79 | |
| 80 | $key = \openssl_digest( \base64_decode( WP2FA::get_secret_key() ), self::DIGEST_ALGORITHM, true ); |
| 81 | |
| 82 | $ivlen = \openssl_cipher_iv_length( self::CIPHER_METHOD ); |
| 83 | |
| 84 | $iv = \substr( $decoded_base, 0, $ivlen ); |
| 85 | $ciphertext_raw = \substr( $decoded_base, $ivlen ); |
| 86 | $text = \openssl_decrypt( $ciphertext_raw, self::CIPHER_METHOD, $key, OPENSSL_RAW_DATA, $iv ); |
| 87 | } |
| 88 | Debugging::log( 'Decrypted text: '. $text ); |
| 89 | |
| 90 | return $text; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Generates random bytes by given size |
| 95 | * |
| 96 | * @param integer $octets - Number of octets for use for random generator. |
| 97 | * |
| 98 | * @return string |
| 99 | * |
| 100 | * @since 2.0.0 |
| 101 | */ |
| 102 | public static function secure_random( int $octets = 0 ): string { |
| 103 | if ( 0 === $octets ) { |
| 104 | $octets = self::BLOCK_BYTE_SIZE; |
| 105 | } |
| 106 | |
| 107 | return \random_bytes( $octets ); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Checks the open ssl methods existence |
| 112 | * |
| 113 | * @return boolean |
| 114 | * |
| 115 | * @since 2.0.0 |
| 116 | */ |
| 117 | public static function is_ssl_available(): bool { |
| 118 | if ( null === self::$ssl_enabled ) { |
| 119 | self::$ssl_enabled = false; |
| 120 | if ( \function_exists( 'openssl_encrypt' ) ) { |
| 121 | self::$ssl_enabled = true; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | return self::$ssl_enabled; |
| 126 | } |
| 127 | } |
| 128 |