ParagonIE_Sodium_Core_AEGIS_State256::dec( string $ci ): string

112    public function dec($ci)113    {114        if (ParagonIE_Sodium_Core_Util::strlen($ci) !== 16) {115            throw new SodiumException('Input must be an AES block in size');116        }117        // z = S1 ^ S4 ^ S5 ^ (S2 & S3)118        $z = $this->state[1]119            ^ $this->state[4]120            ^ $this->state[5]121            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);122        $xi = $ci ^ $z;123        $this->update($xi);124        return $xi;125    }