kcapi_cipher_decrypt_aio3
Decrypt data (asynchronous one shot)
Usage
ssize_t kcapi_cipher_decrypt_aio(struct kcapi_handle * handle, struct iovec * iniov, struct iovec * outiov, size_t iovlen, const uint8_t * iv, int access);
Arguments
handle
[in] cipher handle
iniov
[in] head of scatter-gather list array holding the ciphertext
outiov
[out] head of scatter-gather list with the destination buffers for the plaintext
iovlen
[in] number of scatter-gather list entries
iv
[in] IV to be used for cipher operation
access
[in] kernel access type (KCAPI_ACCESS_HEURISTIC - use internal heuristic for fastest kernel access; KCAPI_ACCESS_VMSPLICE - use vmsplice access; KCAPI_ACCESS_SENDMSG - sendmsg access)
Overview
The individual scatter-gather list entries are processed with separate invocations of the the given cipher.
The memory should be aligned at the page boundary using posix_memalign(sysconf(_SC_PAGESIZE)), If it is not aligned at the page boundary, the vmsplice call may not send all data to the kernel.
The IV buffer must be exactly kcapi_cipher_ivsize bytes in size.
return number of bytes decrypted upon success; a negative errno-style error code if an error occurred
Releases
3 releases since Debian 11 (Bullseye); the text changed 2 times.