AddressRange returns the first and last addresses in the given CIDR range.

下划线写法转为驼峰写法.

Hash hashes the given password, along with the salt.

如果不为空，使用msg panic错误，.

tr -d '\n'.

Try handler(err).

Try handler(err) and finally.

版本比较.

Blocksize is the blocksize of APR1 in bytes.

Prefix is the identifier for the Apache-specific MD5 algorithm.

Rounds is the number of rounds in the big loop.

Size is the size of an MD5 checksum in bytes.