1KCAPI_AEAD_ENCRYPT(3)        Programming Interface       KCAPI_AEAD_ENCRYPT(3)
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NAME

6       kcapi_aead_encrypt - synchronously encrypt AEAD data (one shot)
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SYNOPSIS

9       ssize_t kcapi_aead_encrypt(struct kcapi_handle * handle,
10                                  const uint8_t * in, size_t inlen,
11                                  const uint8_t * iv, uint8_t * out,
12                                  size_t outlen, int access);
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ARGUMENTS

15       handle
16           [in] cipher handle
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18       in
19           [in] plaintext data buffer
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21       inlen
22           [in] length of plaintext buffer
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24       iv
25           [in] IV to be used for cipher operation
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27       out
28           [out] data buffer holding cipher text and authentication tag
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30       outlen
31           [in] length of out buffer
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33       access
34           [in] kernel access type (KCAPI_ACCESS_HEURISTIC - use internal
35           heuristic for fastest kernel access; KCAPI_ACCESS_VMSPLICE - use
36           vmsplice access; KCAPI_ACCESS_SENDMSG - sendmsg access)
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DESCRIPTION

39       The AEAD cipher operation requires the furnishing of the associated
40       authentication data. In case such data is not required, it can be set
41       to NULL and length value must be set to zero.
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43       It is perfectly legal to use the same buffer as the plaintext and
44       ciphertext pointers. That would mean that after the encryption
45       operation, the plaintext is overwritten with the ciphertext.
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47       The memory should be aligned at the page boundary using
48       posix_memalign(sysconf(_SC_PAGESIZE)), If it is not aligned at the page
49       boundary, the vmsplice call may not send all data to the kernel.
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51       The IV buffer must be exactly kcapi_cipher_ivsize bytes in size.
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53       After invoking this function the caller should use
54       kcapi_aead_getdata_output to obtain the resulting ciphertext and
55       authentication tag references.
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IMPORTANT NOTE

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

65       Stephan Mueller <smueller@chronox.de>
66           Author.
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69libkcapi Manual 1.4.0             August 2022            KCAPI_AEAD_ENCRYPT(3)
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