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./Documentation/crypto/crypto_engine.rst:13: WARNING: Unexpected indentation. ./Documentation/crypto/crypto_engine.rst:15: WARNING: Block quote ends without a blank line; unexpected unindent. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Jonathan Corbet <corbet@lwn.net>
51 lines
1.9 KiB
ReStructuredText
51 lines
1.9 KiB
ReStructuredText
=============
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CRYPTO ENGINE
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=============
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Overview
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--------
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The crypto engine API (CE), is a crypto queue manager.
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Requirement
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-----------
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You have to put at start of your tfm_ctx the struct crypto_engine_ctx::
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struct your_tfm_ctx {
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struct crypto_engine_ctx enginectx;
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...
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};
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Why: Since CE manage only crypto_async_request, it cannot know the underlying
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request_type and so have access only on the TFM.
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So using container_of for accessing __ctx is impossible.
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Furthermore, the crypto engine cannot know the "struct your_tfm_ctx",
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so it must assume that crypto_engine_ctx is at start of it.
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Order of operations
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-------------------
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You have to obtain a struct crypto_engine via crypto_engine_alloc_init().
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And start it via crypto_engine_start().
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Before transferring any request, you have to fill the enginectx.
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- prepare_request: (taking a function pointer) If you need to do some processing before doing the request
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- unprepare_request: (taking a function pointer) Undoing what's done in prepare_request
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- do_one_request: (taking a function pointer) Do encryption for current request
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Note: that those three functions get the crypto_async_request associated with the received request.
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So your need to get the original request via container_of(areq, struct yourrequesttype_request, base);
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When your driver receive a crypto_request, you have to transfer it to
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the cryptoengine via one of:
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- crypto_transfer_ablkcipher_request_to_engine()
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- crypto_transfer_aead_request_to_engine()
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- crypto_transfer_akcipher_request_to_engine()
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- crypto_transfer_hash_request_to_engine()
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- crypto_transfer_skcipher_request_to_engine()
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At the end of the request process, a call to one of the following function is needed:
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- crypto_finalize_ablkcipher_request
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- crypto_finalize_aead_request
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- crypto_finalize_akcipher_request
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- crypto_finalize_hash_request
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- crypto_finalize_skcipher_request
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