NAME

       kcapi_aead_decrypt_aio - asynchronously decrypt AEAD data (one shot)

SYNOPSIS

       ssize_t kcapi_aead_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] array of scatter-gather list with input buffers

       outiov
           [out] array of scatter-gather list with output buffers

       iovlen
           [in] number of IOVECs in array

       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)

DESCRIPTION

       The AEAD cipher operation requires the furnishing of the associated authentication data.
       In case such data is not required, it can be set to NULL and length value must be set to
       zero.

       Each IOVEC is processed with its individual AEAD cipher operation. The memory holding the
       input data will receive the processed data.

       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.

       To catch authentication errors (i.e. integrity violations) during the decryption
       operation, the return value of this call should be checked. If this function returns
       -EBADMSG, an authentication error was detected.

IMPORTANT NOTE

       The kernel will only process sysconf(_SC_PAGESIZE) * ALG_MAX_PAGES at one time. Longer
       input data cannot be handled by the kernel.

       return number of bytes encrypted upon success; a negative errno-style error code if an
       error occurred

AUTHOR

       Stephan Mueller <smueller@chronox.de>
           Author.

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