49 строки
1.8 KiB
ReStructuredText
49 строки
1.8 KiB
ReStructuredText
=============
|
|
CRYPTO ENGINE
|
|
=============
|
|
|
|
Overview
|
|
--------
|
|
The crypto engine API (CE), is a crypto queue manager.
|
|
|
|
Requirement
|
|
-----------
|
|
You have to put at start of your tfm_ctx the struct crypto_engine_ctx
|
|
struct your_tfm_ctx {
|
|
struct crypto_engine_ctx enginectx;
|
|
...
|
|
};
|
|
Why: Since CE manage only crypto_async_request, it cannot know the underlying
|
|
request_type and so have access only on the TFM.
|
|
So using container_of for accessing __ctx is impossible.
|
|
Furthermore, the crypto engine cannot know the "struct your_tfm_ctx",
|
|
so it must assume that crypto_engine_ctx is at start of it.
|
|
|
|
Order of operations
|
|
-------------------
|
|
You have to obtain a struct crypto_engine via crypto_engine_alloc_init().
|
|
And start it via crypto_engine_start().
|
|
|
|
Before transferring any request, you have to fill the enginectx.
|
|
- prepare_request: (taking a function pointer) If you need to do some processing before doing the request
|
|
- unprepare_request: (taking a function pointer) Undoing what's done in prepare_request
|
|
- do_one_request: (taking a function pointer) Do encryption for current request
|
|
|
|
Note: that those three functions get the crypto_async_request associated with the received request.
|
|
So your need to get the original request via container_of(areq, struct yourrequesttype_request, base);
|
|
|
|
When your driver receive a crypto_request, you have to transfer it to
|
|
the cryptoengine via one of:
|
|
- crypto_transfer_ablkcipher_request_to_engine()
|
|
- crypto_transfer_aead_request_to_engine()
|
|
- crypto_transfer_akcipher_request_to_engine()
|
|
- crypto_transfer_hash_request_to_engine()
|
|
- crypto_transfer_skcipher_request_to_engine()
|
|
|
|
At the end of the request process, a call to one of the following function is needed:
|
|
- crypto_finalize_ablkcipher_request
|
|
- crypto_finalize_aead_request
|
|
- crypto_finalize_akcipher_request
|
|
- crypto_finalize_hash_request
|
|
- crypto_finalize_skcipher_request
|