HC-128
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A implementation of HC-128 stream cipher. support `no_std` environment.

* [The Stream Cipher HC-128](http://www3.ntu.edu.sg/home/wuhj/research/hc/hc128.pdf)
* [Stream Cipher HC-128 and HC-256; designed by Hongjun Wu](http://www3.ntu.edu.sg/home/wuhj/research/hc/index.html)