The SMS4 algorithm is a data encryption standard as defined in the Chinese government specification 无线局域网产品使用的SMS4密码算法.
The WPI1 implementation fully supports the WPI packet encapsulation of the Chinese WAPI encryption standard for the IEEE 802.11 networks
The core is designed for flow-through operation, with byte-wide input and output interfaces. SMS4 key and WPI initialization vector precede the frame in the flow of data. WPI1 supports encrypt and decrypt modes.