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.\" DO NOT MODIFY THIS FILE! It was generated by gdoc.
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.TH "gnutls_hkdf_expand" 3 "3.6.14" "gnutls" "gnutls"
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.SH NAME
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gnutls_hkdf_expand \- API function
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.SH SYNOPSIS
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.B #include <gnutls/crypto.h>
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.sp
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.BI "int gnutls_hkdf_expand(gnutls_mac_algorithm_t " mac ", const gnutls_datum_t * " key ", const gnutls_datum_t * " info ", void * " output ", size_t " length ");"
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.SH ARGUMENTS
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.IP "gnutls_mac_algorithm_t mac" 12
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the mac algorithm used internally
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.IP "const gnutls_datum_t * key" 12
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the pseudorandom key created with HKDF\-Extract
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.IP "const gnutls_datum_t * info" 12
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the optional informational data
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.IP "void * output" 12
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the output value of the expand operation
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.IP "size_t length" 12
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the desired length of the output key
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.SH "DESCRIPTION"
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This function will derive a variable length keying material from
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the pseudorandom key using the HKDF\-Expand function as defined in
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RFC 5869.
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.SH "RETURNS"
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Zero or a negative error code on error.
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.SH "SINCE"
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3.6.13
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.SH "REPORTING BUGS"
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Report bugs to <bugs@gnutls.org>.
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.br
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Home page: https://www.gnutls.org
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.SH COPYRIGHT
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Copyright \(co 2001- Free Software Foundation, Inc., and others.
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.br
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Copying and distribution of this file, with or without modification,
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are permitted in any medium without royalty provided the copyright
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notice and this notice are preserved.
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.SH "SEE ALSO"
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The full documentation for
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.B gnutls
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is maintained as a Texinfo manual.
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If the /usr/share/doc/gnutls/
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directory does not contain the HTML form visit
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.B
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.IP https://www.gnutls.org/manual/
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.PP
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