1KCAPI_AEAD_DECRYPT_A(3)      Programming Interface     KCAPI_AEAD_DECRYPT_A(3)
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NAME

6       kcapi_aead_decrypt_aio - asynchronously decrypt AEAD data (one shot)
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SYNOPSIS

9       ssize_t kcapi_aead_decrypt_aio(struct kcapi_handle * handle,
10                                      struct iovec * iniov,
11                                      struct iovec * outiov, size_t iovlen,
12                                      const uint8_t * iv, int access);
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ARGUMENTS

15       handle
16           [in] cipher handle
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18       iniov
19           [in] array of scatter-gather list with input buffers
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21       outiov
22           [out] array of scatter-gather list with output buffers
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24       iovlen
25           [in] number of IOVECs in array
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27       iv
28           [in] IV to be used for cipher operation
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30       access
31           [in] kernel access type (KCAPI_ACCESS_HEURISTIC - use internal
32           heuristic for fastest kernel access; KCAPI_ACCESS_VMSPLICE - use
33           vmsplice access; KCAPI_ACCESS_SENDMSG - sendmsg access)
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DESCRIPTION

36       The AEAD cipher operation requires the furnishing of the associated
37       authentication data. In case such data is not required, it can be set
38       to NULL and length value must be set to zero.
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40       Each IOVEC is processed with its individual AEAD cipher operation. The
41       memory holding the input data will receive the processed data.
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43       The memory should be aligned at the page boundary using
44       posix_memalign(sysconf(_SC_PAGESIZE)), If it is not aligned at the page
45       boundary, the vmsplice call may not send all data to the kernel.
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47       The IV buffer must be exactly kcapi_cipher_ivsize bytes in size.
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49       To catch authentication errors (i.e. integrity violations) during the
50       decryption operation, the return value of this call should be checked.
51       If this function returns -EBADMSG, an authentication error was
52       detected.
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IMPORTANT NOTE

55       The kernel will only process sysconf(_SC_PAGESIZE) * ALG_MAX_PAGES at
56       one time. Longer input data cannot be handled by the kernel.
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58       return number of bytes encrypted upon success; a negative errno-style
59       error code if an error occurred
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AUTHOR

62       Stephan Mueller <smueller@chronox.de>
63           Author.
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66libkcapi Manual 1.3.1              July 2021           KCAPI_AEAD_DECRYPT_A(3)
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