On Thu, May 12, 2016 at 10:46 AM, Nikhil Agarwal <nikhil.agar...@linaro.org> wrote:
> Signed-off-by: Nikhil Agarwal <nikhil.agar...@linaro.org> > --- > doc/users-guide/users-guide.adoc | 83 > +++++++++++++++++++++++++++++++--------- > 1 file changed, 65 insertions(+), 18 deletions(-) > > diff --git a/doc/users-guide/users-guide.adoc > b/doc/users-guide/users-guide.adoc > index 0221634..e8d690e 100644 > --- a/doc/users-guide/users-guide.adoc > +++ b/doc/users-guide/users-guide.adoc > @@ -909,24 +909,71 @@ include::users-guide-pktio.adoc[] > > == Cryptographic services > > -ODP provides support for cryptographic operations required by various > security > -protocols (e.g. IPSec). To apply a cryptographic operation to a packet a > session > -must be created first. Packets processed by a session share the same > cryptographic > -parameters like algorithms, keys, initialization vectors. A session is > created with > -*odp_crypto_session_create()* call. After session creation a > cryptographic operation > -can be applied to a packet using *odp_crypto_operation()* call. > -Depending on the session type - synchronous or asynchronous the operation > returns > -when the operation completed or after the request has been submitted. In > the > -asynchronous case an operation completion event will be enqueued on the > session > -completion queue. The completion event conveys the status of the > operation and > -the result. The application has the responsibility to free the completion > event. > -The operation arguments specify for each packet the areas which are to be > encrypted > -or decrypted and authenticated. Also, in asynchronous case a context can > be > -associated with a given operation and when the operation completion event > is > -retrieved the associated context can be retrieved. An operation can be > executed > -in-place, when the output packet is the same as the input packet or the > output > -packet can be a new packet provided by the application or allocated by the > -implementation from the session output pool. > +ODP provides APIs to perform cryptographic operations required by various > +communication protocols (e.g. IPSec). ODP cryptographic APIs are session > based. > + > +ODP provides APIs for following cryptographic services: > + > +* Ciphering > +* Authentication/data integrity via Keyed-Hashing (HMAC) > +* Random number generation > +* Crypto capability inquiries > + > +=== Crypto Sessions > + > +To apply a cryptographic operation to a packet a session must be created. > All > +packets processed by a session share the parameters that define the > session. > + > +ODP supports synchronous and asynchronous crypto sessions. For > asynchronous > +sessions, the output of crypto operation is posted in a queue defined as > +completion queue in session parameters. > + > +ODP crypto APIs support chained operation sessions in which hashing and > ciphering > +both can be achieved using single session and operation call. The order > of cipher > +and hashing can be controlled by `auth_cipher_text` session parameter. > + > +Other Session parameters include algorithms, keys, initialization vector > +(optional), encode or decode, output queue for async mode and output > packet pool > +for allocation of an output packet if required. > + > +=== Crypto operations > + > +After session creation, a cryptographic operation can be applied to a > packet > +using the `odp_crypto_operation()` API. Depending on the implementation > +(synchronous or asynchronous) the API returns when the operation is > completed > +or after the request has been submitted. > + > +The operation arguments specify for each packet the areas that are to be > +encrypted or decrypted and authenticated. Also, there is an option of > overriding > +the initialization vector specified in session parameters. > + > +An operation can be executed in in-place, out-of-place or new buffer mode. > +In in-place mode output packet is same as the input packet. > +In case of out-of-place mode output packet is different from input packet > as > +specified by the application, while in new buffer mode implementation > allocates > +a new output buffer from the session’s output pool. > + > +User can also specify a context associated with a given operation that > will be > +retained during async operation and can be retrieved via the completion > event. > + > +In the case of an async session, the `*posted` (output variable of > +odp_crypto_operation API) will be set to true. Results of an asynchronous > +session will be posted as completion events to the session’s completion > queue, > +which can be accessed directly or via ODP scheduler. The completion event > +contains the status of the operation and the result. The application has > the > +responsibility to free the completion event. > + > +=== Random number Generation > + > +ODP provides an API `odp_random_data` to generate random data bytes. It > has > `odp_random_data()` (include the parens to make it clear this is a function call, that's what we've been doing consistently within this guide. > +an argument to specify whether to use system entropy source for random > number > +generation or not. > + > +=== Capability inquiries > + > +ODP provides an API interface `odp_crypto_capability` to inquire > implementation’s > `odp_crypto_capability()` > +crypto capabilities. This interface returns a bitmask for supported > algorithms > +and hardware backed algorithms. > > include::users-guide-tm.adoc[] > > -- > 2.8.2 > > _______________________________________________ > lng-odp mailing list > lng-odp@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/lng-odp >
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