logicog e21ce4ce80 ChaCha20 implementation for encryption ...

Add an implementation in 8051 assembler for the generation of a
ChaCha20 keystream and an encryption function using the keystream
in C.

A test function using the example from RFC7539 is provided in
chacha20_test.

Keys, nonce, and block counter and the pointers to the input plaintext,
its length and the output pointer are provided via a struct chacha20,
which also holds the working state of the ChaCha20 algorithm

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..

chacha20.c

ChaCha20 implementation for encryption

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chacha_8051.asm

ChaCha20 implementation for encryption

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chacha.h

ChaCha20 implementation for encryption

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