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Subject[PATCH 1/6] Documentation: crypto: document crypto engine API
Signed-off-by: Corentin Labbe <>
Documentation/crypto/crypto_engine.rst | 46 ++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Documentation/crypto/crypto_engine.rst

diff --git a/Documentation/crypto/crypto_engine.rst b/Documentation/crypto/crypto_engine.rst
new file mode 100644
index 000000000000..b0ed37f9fb0c
--- /dev/null
+++ b/Documentation/crypto/crypto_engine.rst
@@ -0,0 +1,46 @@
+The crypto engine API (CE), is a crypto queue manager.
+You have to put at start of your tfm_ctx the struct crypto_engine_reqctx
+struct your_tfm_ctx {
+ struct crypto_engine_reqctx 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_reqctx 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_cipher_request_to_engine()
+- crypto_transfer_skcipher_request_to_engine()
+- crypto_transfer_akcipher_request_to_engine()
+- crypto_transfer_hash_request_to_engine()
+At the end of the request process, a call to one of the following function is needed:
+- crypto_finalize_cipher_request
+- crypto_finalize_skcipher_request
+- crypto_finalize_akcipher_request
+- crypto_finalize_hash_request
 \ /
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