• Stephan Mueller's avatar
    crypto: algif_aead - overhaul memory management · d887c52d
    Stephan Mueller authored
    The updated memory management is described in the top part of the code.
    As one benefit of the changed memory management, the AIO and synchronous
    operation is now implemented in one common function. The AF_ALG
    operation uses the async kernel crypto API interface for each cipher
    operation. Thus, the only difference between the AIO and sync operation
    types visible from user space is:
    1. the callback function to be invoked when the asynchronous operation
       is completed
    2. whether to wait for the completion of the kernel crypto API operation
       or not
    The change includes the overhaul of the TX and RX SGL handling. The TX
    SGL holding the data sent from user space to the kernel is now dynamic
    similar to algif_skcipher. This dynamic nature allows a continuous
    operation of a thread sending data and a second thread receiving the
    data. These threads do not need to synchronize as the kernel processes
    as much data from the TX SGL to fill the RX SGL.
    The caller reading the data from the kernel defines the amount of data
    to be processed. Considering that the interface covers AEAD
    authenticating ciphers, the reader must provide the buffer in the
    correct size. Thus the reader defines the encryption size.
    Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
algif_aead.c 24.6 KB