NAME

       kcapi_hkdf - Extract-and-Expand HKDF (RFC5869)

SYNOPSIS

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

ARGUMENTS

       hashname
           [in] kernel crypto API name of a keyed hash (e.g. hmac(sha1))

       ikm
           [in] Input Keying Material (IKM) -- must be provided

       ikmlen
           [in] IKM buffer length -- must be non-zero

       salt
           [in] salt buffer -- may be NULL

       saltlen
           [in] salt buffer length -- may be zero

       info
           [in] info buffer -- may be NULL

       infolen
           [in] info buffer length -- may be zero

       dst
           [out] Buffer to store the generated key in,

       dlen
           [in] Length of the dst buffer. This value defines the number of bytes generated by the
           KDF.

DESCRIPTION

       Perform the key-derivation function according to RFC5869. The input data is defined in
       sections 2.2 und 2.3 of RFC5869.

       return 0 upon success; a negative errno-style error code if an error occurred

AUTHOR

       Stephan Mueller <smueller@chronox.de>
           Author.

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