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<?php |
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namespace GeminiLabs\SiteReviews\Modules; |
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class Encryption |
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{ |
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public function decode(string $string): string |
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{ |
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return base64_decode(str_replace(['-', '_'], ['+', '/'], $string)); |
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} |
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/** |
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* @return string|false |
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*/ |
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public function decrypt(string $message) |
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{ |
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$decoded = $this->decode($message); |
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if (empty($decoded)) { |
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return ''; |
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} |
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try { |
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$nonceLength = \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES; |
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if (strlen($decoded) >= $nonceLength + 1) { // Minimum for new format |
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$nonce = substr($decoded, 0, $nonceLength); |
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$ciphertext = substr($decoded, $nonceLength); |
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if (strlen($nonce) === $nonceLength) { |
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$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $this->key()); |
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if (false !== $plaintext) { |
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return $plaintext; // Success with new format |
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} |
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} |
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} |
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return $this->legacyDecrypt($decoded); |
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} catch (\Exception $e) { |
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glsr_log()->error($e->getMessage()); |
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return false; |
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} |
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} |
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public function decryptRequest(string $message): array |
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{ |
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if ($message = $this->decrypt($message)) { |
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$data = explode('|', $message); |
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$data = array_map('sanitize_text_field', $data); |
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$action = array_shift($data); |
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return compact('action', 'data'); |
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} |
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return []; |
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} |
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public function encode(string $string): string |
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{ |
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return str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($string)); |
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} |
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/** |
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* @return string|false |
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*/ |
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public function encrypt(string $message) |
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{ |
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try { |
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$nonce = random_bytes(\SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
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$ciphertext = sodium_crypto_secretbox($message, $nonce, $this->key()); |
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// Prepend nonce to ciphertext |
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return $this->encode($nonce.$ciphertext); |
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} catch (\Exception $e) { |
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glsr_log()->error($e->getMessage()); |
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return false; |
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} |
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} |
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public function encryptRequest(string $action, array $data): string |
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{ |
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$values = array_values(array_map('sanitize_text_field', $data)); |
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$message = implode('|', $values); |
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$message = sprintf('%s|%s', $action, $message); |
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return (string) $this->encrypt($message); |
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} |
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/** |
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* @return string|false |
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*/ |
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protected function legacyDecrypt(string $ciphertext) |
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{ |
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try { |
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$plaintext = sodium_crypto_secretbox_open($ciphertext, $this->legacyNonce(), $this->key()); |
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if (false === $plaintext) { |
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throw new \Exception('Legacy decryption failed'); |
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} |
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return $plaintext; |
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} catch (\Exception $e) { |
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glsr_log()->error($e->getMessage()); |
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return false; |
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} |
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} |
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protected function legacyNonce(): string |
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{ |
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$nonce = defined('NONCE_SALT') ? \NONCE_SALT : ''; |
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$nonce = substr($nonce, 0, \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
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return str_pad($nonce, \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '#'); |
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} |
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protected function key(): string |
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{ |
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$key = defined('NONCE_KEY') ? \NONCE_KEY : ''; |
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$key = substr($key, 0, \SODIUM_CRYPTO_SECRETBOX_KEYBYTES); |
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return str_pad($key, \SODIUM_CRYPTO_SECRETBOX_KEYBYTES, '#'); |
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} |
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} |
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pryley /
site-reviews
