NAME

       kcapi_cipher_stream_op - obtain processed data (stream)

SYNOPSIS

       ssize_t kcapi_cipher_stream_op(struct kcapi_handle * handle, struct iovec * iov,
                                      size_t iovlen);

ARGUMENTS

       handle
           [in] cipher handle

       iov
           [out] scatter/gather list pointing to buffers to be filled with the resulting data
           from a cipher operation.

       iovlen
           [in] number of scatter/gather list elements.

DESCRIPTION

       This call can be called interleaved with kcapi_cipher_stream_update to fetch the processed
       data.

       This function may cause the caller to sleep if the kernel buffer holding the data is
       empty. The process will be woken up once more data is sent by calling
       kcapi_cipher_stream_update.

       Note, when supplying buffers that are not multiple of block size, the buffers will only be
       filled up to the maximum number of full block sizes that fit into the buffer.

       The kernel supports multithreaded applications where one or more threads send data via the
       kcapi_cipher_stream_update function and another thread collects the processed data via
       kcapi_cipher_stream_op. The kernel, however, will return data via kcapi_cipher_stream_op
       as soon as it has some data available. For example, one thread sends 1000 bytes to be
       encrypted and another thread already waits for the ciphertext. The kernel may send only,
       say, 500 bytes back to the waiting process during one kcapi_cipher_stream_op call. In a
       subsequent calls to kcapi_cipher_stream_op more ciphertext is returned. This implies that
       when the receiving thread shall collect all data there is, kcapi_cipher_stream_op must be
       called in a loop until all data is received.

       return number of bytes obtained from the kernel upon success; a negative errno-style error
       code if an error occurred

AUTHOR

       Stephan Mueller <smueller@chronox.de>
           Author.

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