This code to implement connnection with data base. This is mainly to decrypt and encrypt database contents. This for cryptography.(security)

Freeware implementation of the Secure Hashing Standard, defined in FIPS PUB 180-1, defines the Secure Hashing Algorithm (SHA-1). SHA-1 can be used to produce a message digest for a given message. Essentially, this is a 160-bit number that represents

是一个用于数据加密的代码，我的第一个项目就是用它来进行通信数据加密的-Is a code used for data encryption, my first project is to use it to communicate data encryption

this is a base based compression method, to reduce the length of data.