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<?php |
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|
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namespace Bitcode\BitForm\Core\Cryptography; |
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|
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use BitCode\BitForm\Core\Util\Log; |
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use Exception; |
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|
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class SodiumCompat |
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{ |
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public function __construct() |
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{ |
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if (class_exists('ParagonIE_Sodium_Compat')) { |
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return; |
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} |
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|
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$autoloader = ABSPATH . WPINC . '/sodium_compat/autoload.php'; |
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if (!is_readable($autoloader)) { |
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Log::debug_log('WordPress sodium_compat autoloader not readable at ' . $autoloader); |
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|
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return; |
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} |
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|
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require_once $autoloader; |
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} |
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|
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/** |
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* Wrap crypto_aead_*_encrypt() in a drop-dead-simple encryption interface |
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* |
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* @link https://paragonie.com/b/kIqqEWlp3VUOpRD7 |
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* @param string $message |
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* @param string $key |
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* @return string |
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*/ |
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public function compatEncrypt($message, $key) |
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{ |
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// cast $message to string |
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if (!is_string($message)) { |
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$message = strval($message); |
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} |
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|
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$nonce = \random_bytes(24); // NONCE = Number to be used ONCE, for each message |
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$encrypted = \ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_encrypt( |
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$message, |
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$nonce, |
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$nonce, |
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$key |
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); |
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|
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return $nonce . $encrypted; |
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} |
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|
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/** |
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* Wrap crypto_aead_*_decrypt() in a drop-dead-simple decryption interface |
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* |
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* @link https://paragonie.com/b/kIqqEWlp3VUOpRD7 |
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* @param string $message - Encrypted message |
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* @param string $key - Encryption key |
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* @return string |
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* @throws Exception |
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*/ |
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public function compatDecrypt($message, $key) |
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{ |
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$nonce = mb_substr($message, 0, 24, '8bit'); |
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$ciphertext = mb_substr($message, 24, null, '8bit'); |
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$plaintext = \ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_decrypt( |
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$ciphertext, |
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$nonce, |
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$nonce, |
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$key |
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); |
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if (!is_string($plaintext)) { |
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Log::debug_log('Decryption failed'); |
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} |
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return $plaintext; |
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} |
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} |
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|
