kcapi_cipher_stream_init_dec — start a decryption operation (stream)
int32_t kcapi_cipher_stream_init_dec ( | struct kcapi_handle * handle, |
| const uint8_t * iv, | |
| struct iovec * iov, | |
uint32_t iovlen); |
handle[in] cipher handle
iv[in] IV to be used for cipher operation
iov[in] scatter/gather list with data to be encrypted. This is the pointer to the first iov entry if an array of iov entries is supplied. See sendmsg(2) for details on how iov is to be used. This pointer may be NULL if no data to be encrypted is available at the point of the call.
iovlen[in] number of scatter/gather list elements. If iov is NULL, this value must be zero.
A stream decryption operation is started with this call. Multiple
successive kcapi_cipher_stream_update function calls can be invoked to
send more ciphertext data to be decrypted. The kernel buffers the input
until kcapi_cipher_stream_op picks up the decrypted data. Once ciphertext
is decrypted during the kcapi_cipher_stream_op it is removed from the
kernel buffer.
The function calls of kcapi_cipher_stream_update and
kcapi_cipher_stream_op can be mixed, even by multiple threads of an
application.
The IV buffer must be exactly kcapi_cipher_ivsize bytes in size.
return number of bytes sent to the kernel upon success;
a negative errno-style error code if an error occurred