Signed-off-by: Nikhil Agarwal <[email protected]> --- 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 +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 +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 [email protected] https://lists.linaro.org/mailman/listinfo/lng-odp
