ParagonIE\Halite\Structure\MerkleTree::setHashSize PHP Method

    public function setHashSize(int $size) : self
    {
        if ($size < \Sodium\CRYPTO_GENERICHASH_BYTES_MIN) {
            throw new InvalidDigestLength(\sprintf('Merkle roots must be at least %d long.', \Sodium\CRYPTO_GENERICHASH_BYTES_MIN));
        }
        if ($size > \Sodium\CRYPTO_GENERICHASH_BYTES_MAX) {
            throw new InvalidDigestLength(\sprintf('Merkle roots must be at most %d long.', \Sodium\CRYPTO_GENERICHASH_BYTES_MAX));
        }
        if ($this->outputSize !== $size) {
            $this->rootCalculated = false;
        }
        $this->outputSize = $size;
        return $this;
    }