1KCAPI_HKDF(3)                Programming Interface               KCAPI_HKDF(3)
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NAME

6       kcapi_hkdf - Extract-and-Expand HKDF (RFC5869)
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SYNOPSIS

9       ssize_t kcapi_hkdf(const char * hashname, const uint8_t * ikm,
10                          size_t ikmlen, const uint8_t * salt,
11                          uint32_t saltlen, const uint8_t * info,
12                          size_t infolen, uint8_t * dst, size_t dlen);
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ARGUMENTS

15       hashname
16           [in] kernel crypto API name of a keyed hash (e.g. hmac(sha1))
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18       ikm
19           [in] Input Keying Material (IKM) -- must be provided
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21       ikmlen
22           [in] IKM buffer length -- must be non-zero
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24       salt
25           [in] salt buffer -- may be NULL
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27       saltlen
28           [in] salt buffer length -- may be zero
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30       info
31           [in] info buffer -- may be NULL
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33       infolen
34           [in] info buffer length -- may be zero
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36       dst
37           [out] Buffer to store the generated key in,
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39       dlen
40           [in] Length of the dst buffer. This value defines the number of
41           bytes generated by the KDF.
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DESCRIPTION

44       Perform the key-derivation function according to RFC5869. The input
45       data is defined in sections 2.2 und 2.3 of RFC5869.
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47       return 0 upon success; a negative errno-style error code if an error
48       occurred
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AUTHOR

51       Stephan Mueller <smueller@chronox.de>
52           Author.
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55libkcapi Manual 1.3.1              July 2021                     KCAPI_HKDF(3)
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