Commits on Jun 9, 2020

1. block-cipher: add BlockCipherMut …

   Adds a stateful equivalent to `BlockCipher` that permits `&mut self`
   access to the underlying type.
   
   The main use case for this trait is hardware cryptographic accelerators
   which need to e.g. communitate with a peripheral device via an
   underlying `&mut` reference.
   
   While it's possible to use some underlying logic to use the existing
   `BlockCipher` trait in such a scenario, the solutions are somewhat ugly.
   Here is a real-world example:
   
   https://github.com/iqlusioninc/usbarmory.rs/blob/develop/firmware/usbarmory/src/dcp/aes128.rs#L198-L236
   
   The idea with `BlockCipherMut` would be to alternatively provide
   `AeadMut`/`AeadMutInPlace` for AEAD modes with an underlying
   `BlockCipherMut` (when possible).

   

   tarcieri committed Jun 9, 2020
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