tree 6f55b262ef4f7cb5024c885c10bfad3fed81dc2e
parent b54094bd7c083fbf555ad839f445573a4e8df045
author Hanno Becker <hanno.becker@arm.com> 1590678919 +0100
committer Hanno Becker <hanno.becker@arm.com> 1590911485 +0100

Introduce configuration option for TLS 1.3 padding granularity

TLS 1.3 record protection allows the addition of an arbitrary amount
of padding.

This commit introduces a configuration option

```
   MBEDTLS_SSL_TLS13_PADDING_GRANULARITY
```

The semantics of this option is that padding is chosen in a minimal
way so that the padded plaintext has a length which is a multiple of
MBEDTLS_SSL_TLS13_PADDING_GRANULARITY.

For example, setting MBEDTLS_SSL_TLS13_PADDING_GRANULARITY to 1024
means that padded plaintexts will have length 1024, 2048, ..., while
setting it to 1 means that no padding will be used.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>