mbedtls/include
Hanno Becker 9eddaebda5 Provide standalone version of ssl_encrypt_buf
The previous version of the record encryption function
`ssl_encrypt_buf` takes the entire SSL context as an argument,
while intuitively, it should only depend on the current security
parameters and the record buffer.

Analyzing the exact dependencies, it turned out that in addition
to the currently active `ssl_transform` instance and the record
information, the encryption function needs access to
- the negotiated protocol version, and
- the status of the encrypt-then-MAC extension.

This commit moves these two fields into `ssl_transform` and
changes the signature of `ssl_encrypt_buf` to only use an instance
of `ssl_transform` and an instance of the new `ssl_record` type.
The `ssl_context` instance is *solely* kept for the debugging macros
which need an SSL context instance.

The benefit of the change is twofold:
1) It avoids the need of the MPS to deal with instances of
   `ssl_context`. The MPS should only work with records and
   opaque security parameters, which is what the change in
   this commit makes progress towards.
2) It significantly eases testing of the encryption function:
   independent of any SSL context, the encryption function can
   be passed some record buffer to encrypt alongside some arbitrary
   choice of parameters, and e.g. be checked to not overflow the
   provided memory.
2019-04-25 12:58:21 +01:00
..
mbedtls Provide standalone version of ssl_encrypt_buf 2019-04-25 12:58:21 +01:00
.gitignore Rename include directory to mbedtls 2015-03-10 11:23:56 +00:00
CMakeLists.txt Fix some comments regarding what files are symlinked 2018-03-23 14:39:52 +01:00