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<?php |
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|
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namespace IvyForms\Services\Payment; |
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|
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use RuntimeException; |
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|
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/** |
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* Encrypts/decrypts sensitive tokens at rest in WordPress options. |
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*/ |
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class TokenEncryptionService |
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{ |
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private const CIPHER = 'AES-256-CBC'; |
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|
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/** |
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* @throws RuntimeException When OpenSSL cannot encrypt the token. |
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*/ |
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public function encrypt(string $plainText): string |
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{ |
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if ($plainText === '') { |
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return ''; |
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} |
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|
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$key = $this->getKey(); |
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$ivLength = openssl_cipher_iv_length(self::CIPHER); |
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$iv = openssl_random_pseudo_bytes($ivLength); |
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$encrypted = openssl_encrypt($plainText, self::CIPHER, $key, OPENSSL_RAW_DATA, $iv); |
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|
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if ($encrypted === false) { |
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throw new RuntimeException('Unable to encrypt payment token.'); |
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} |
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|
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return base64_encode($iv . $encrypted); |
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} |
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|
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public function decrypt(string $cipherText): string |
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{ |
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if ($cipherText === '') { |
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return ''; |
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} |
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|
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$decoded = base64_decode($cipherText, true); |
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if ($decoded === false) { |
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return ''; |
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} |
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|
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$ivLength = openssl_cipher_iv_length(self::CIPHER); |
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$iv = substr($decoded, 0, $ivLength); |
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$encrypted = substr($decoded, $ivLength); |
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$plain = openssl_decrypt($encrypted, self::CIPHER, $this->getKey(), OPENSSL_RAW_DATA, $iv); |
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|
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return $plain !== false ? $plain : ''; |
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} |
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|
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private function getKey(): string |
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{ |
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return hash('sha256', wp_salt('auth'), true); |
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} |
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} |
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|
