ParagonIE_Sodium_Compat::crypto_aead_aegis256_decrypt( string $ciphertext = '', string $assocData = '', string $nonce = '', string $key = '' ): string

454    public static function crypto_aead_aegis256_decrypt(455        $ciphertext = '',456        $assocData = '',457        $nonce = '',458        #[\SensitiveParameter]459        $key = ''460    ) {461        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);462        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);463        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);464        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);465 466        /* Input validation: */467        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS256_NPUBBYTES) {468            throw new SodiumException('Nonce must be CRYPTO_AEAD_AEGIS256_NPUBBYTES long');469        }470        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS256_KEYBYTES) {471            throw new SodiumException('Key must be CRYPTO_AEAD_AEGIS256_KEYBYTES long');472        }473        $ct_length = ParagonIE_Sodium_Core_Util::strlen($ciphertext);474        if ($ct_length < self::CRYPTO_AEAD_AEGIS256_ABYTES) {475            throw new SodiumException('Message must be at least CRYPTO_AEAD_AEGIS256_ABYTES long');476        }477 478        $ct = ParagonIE_Sodium_Core_Util::substr(479            $ciphertext,480            0,481            $ct_length - self::CRYPTO_AEAD_AEGIS256_ABYTES482        );483        $tag = ParagonIE_Sodium_Core_Util::substr(484            $ciphertext,485            $ct_length - self::CRYPTO_AEAD_AEGIS256_ABYTES,486            self::CRYPTO_AEAD_AEGIS256_ABYTES487        );488        return ParagonIE_Sodium_Core_AEGIS256::decrypt($ct, $tag, $assocData, $key, $nonce);489    }