kcapi_aead_stream_update - Man Page

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

handle

iov

iovlen

Using this function call, more plaintext for encryption or ciphertext for decryption can be submitted to the kernel​.

Note, see the order of input data as outlined in kcapi_aead_stream_init_dec​.

This function may cause the caller to sleep if the kernel buffer holding the data is getting full​. The process will be woken up once more buffer space becomes available by calling kcapi_aead_stream_op​.

The last block of input data MUST be provided with kcapi_aead_stream_update_last as the kernel must be informed about the completion of the input data​.

With the separate API calls of kcapi_aead_stream_update and kcapi_aead_stream_op a multi-threaded application can be implemented where one thread sends data to be processed and one thread picks up data processed by the cipher operation​.

The memory referenced by iov is not accessed by the kernel during this call​. The memory is first accessed when kcapi_cipher_stream_op is called​. Thus, you MUST make sure that the referenced memory is still present at the time kcapi_cipher_stream_op is called​.

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

Stephan Mueller <​smueller@chronox.de​>