• Joel Fernandes's avatar
    crypto: omap-aes - Add support for cases of unaligned lengths · 6242332f
    Joel Fernandes authored
    For cases where offset/length of on any page of the input SG is not aligned by
    AES_BLOCK_SIZE, we copy all the pages from the input SG list into a contiguous
    buffer and prepare a single element SG list for this buffer with length as the
    total bytes to crypt.
    
    This is requried for cases such as when an SG list of 16 bytes total size
    contains 16 pages each containing 1 byte. DMA using the direct buffers of such
    instances is not possible.
    
    For this purpose, we first detect if the unaligned case and accordingly
    allocate enough number of pages to satisfy the request and prepare SG lists.
    We then copy data into the buffer, and copy data out of it on completion.
    Signed-off-by: default avatarJoel Fernandes <joelf@ti.com>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    6242332f
omap-aes.c 30.6 KB