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Author SHA1 Message Date
Daniel King f28c2aa64e Allow some parameters to be NULL if the length is 0. 
This change permits users of the ChaCha20/Poly1305 algorithms
(and the AEAD construction thereof) to pass NULL pointers for
data that they do not need, and avoids the need to provide a valid
buffer for data that is not used.
 2018-05-10 13:20:52 +02:00
Daniel King 31ac12e004 Implement AEAD-ChaCha20-Poly1305. 
This implementation is based off the description in RFC 7539.

The ChaCha20 code is also updated to provide a means of generating
keystream blocks with arbitrary counter values. This is used to
generated the one-time Poly1305 key in the AEAD construction.
 2018-05-10 13:20:52 +02:00
Daniel King 0fe7b5b8c5 Add ChaCha20 to the Cipher module 2018-05-10 13:19:31 +02:00
Daniel King a98ff5eadf Initial implementation of ChaCha20 2018-05-10 13:19:31 +02:00