Commit graph

21 commits

Author SHA1 Message Date
Janos Follath 24eed8d2d2 Initialise return values to an error
Initialising the return values to and error is best practice and makes
the library more robust.
2019-12-03 16:07:18 +00:00
Hanno Becker 1eeca41472 Improve macro hygiene
This commit improves hygiene and formatting of macro definitions
throughout the library. Specifically:
- It adds brackets around parameters to avoid unintended
  interpretation of arguments, e.g. due to operator precedence.
- It adds uses of the `do { ... } while( 0 )` idiom for macros that
  can be used as commands.
2019-02-19 17:59:00 +00:00
Hanno Becker 305e4e4f32 Implement parameter validation for ChaCha/Poly modules 2018-12-18 15:30:30 +00:00
Manuel Pégourié-Gonnard 21a65e0011 Fix usage of inline with for some compilers 2018-06-07 11:54:17 +02:00
Manuel Pégourié-Gonnard 1729789075 Misc style adjustments
- fix some whitespace
- fix most overlong lines
- remove some superfluous parentheses
- s/result/ret/ for consistency with the rest of the library
2018-05-24 18:50:18 +02:00
Manuel Pégourié-Gonnard 98fae6d800 ChaCha20: move working state from ctx to stack
No need to keep it around.
2018-05-24 17:38:31 +02:00
Manuel Pégourié-Gonnard 9620f9b99e Rm mbedtls_ prefix form static functions
- prefix is no necessary for static ids and makes lines longer
- most often omitted (even though we're not fully consistent)
2018-05-24 17:04:02 +02:00
Manuel Pégourié-Gonnard fb78c90138 Use recently-introduced platform_util module 2018-05-24 16:54:57 +02:00
Manuel Pégourié-Gonnard c0dfcd4bf1 Simplify selftest functions using macros
This reduces clutter, making the functions more readable.

Also, it makes lcov see each line as covered. This is not cheating, as the
lines that were previously seen as not covered are not supposed to be reached
anyway (failing branches of the selftests).

Thanks to this and previous test suite enhancements, lcov now sees chacha20.c
and poly1305.c at 100% line coverage, and for chachapoly.c only two lines are
not covered (error returns from lower-level module that should never happen
except perhaps if an alternative implementation returns an unexpected error).
2018-05-24 13:37:31 +02:00
Manuel Pégourié-Gonnard 55c0d096b7 chacha20: fix bug in starts() and add test for it
Previously the streaming API would fail when encrypting multiple messages with
the same key.
2018-05-24 13:37:31 +02:00
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