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11 commits

Author SHA1 Message Date
Manuel Pégourié-Gonnard 56206c4db1 Remove semi-internal chacha20_keystrem_block() 
It's actually easy to implement chachapoly without it, so let's not clutter
the API (and avoid adding a burden to alt implementers).
 2018-05-24 13:37:31 +02:00
Manuel Pégourié-Gonnard 502f189253 ChaCha20: allow in-place en/decryption 
All other ciphers so far allow this. In particular, the TLS layer depends on
this, despite what's documented in the Cipher layer, see
https://github.com/ARMmbed/mbedtls/issues/1085
https://github.com/ARMmbed/mbedtls/issues/1087

Also, this can be useful for implementing chachapoly without depending on the
semi-internal function keystream_block(), see next commit.
 2018-05-24 13:37:31 +02:00
Manuel Pégourié-Gonnard b7e99006f9 Avoid using %zu in selftest functions 
This is a C99 feature and unfortunately we can't rely on it yet considering
the set of toolchain (versions) we want to support.
 2018-05-24 13:37:31 +02:00
Manuel Pégourié-Gonnard 95d0bdbd84 Adapt the _ALT style to our new standard 
- in .h files: only put the context declaration inside the #ifdef _ALT
  (this was changed in 2.9.0, ie after the original PR)
- in .c file: only leave selftest out of _ALT: even though some function are
  trivial to build from other parts, alt implementors might want to go another
way about them (for efficiency or other reasons)
 2018-05-24 13:37:31 +02:00
Daniel King e6e7968c3a Minor style and formatting fixes. 
This change corrects some minor style violations, mostly for spacing
around parentheses.
 2018-05-24 13:37:31 +02:00
Daniel King b6897f67a4 Correct signedness of printf specifier in self tests 2018-05-24 13:37:31 +02:00
Daniel King dedf4a3e7b Adjust verbose self-test output to match other ciphers. 2018-05-24 13:37:31 +02:00
Daniel King a310c5e42b 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.
 2018-05-24 13:37:31 +02:00
Daniel King b8025c5826 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.
 2018-05-24 13:37:31 +02:00
Daniel King bd92062269 Add ChaCha20 to the Cipher module 2018-05-24 13:37:31 +02:00
Daniel King 34b822ce7b Initial implementation of ChaCha20 2018-05-24 13:37:31 +02:00