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+.TH LIBKECCAK_HMAC_CREATE 3 LIBKECCAK
+.SH NAME
+libkeccak_hmac_create - Allocate and initialise HMAC-hashing state
+.SH SYNOPSIS
+.nf
+#include <libkeccak.h>
+
+struct libkeccak_hmac_state *libkeccak_hmac_create(const struct libkeccak_spec *\fIspec\fP, const void *\fIkey\fP, size_t \fIkey_length\fP);
+.fi
+.PP
+Link with
+.IR -lkeccak .
+.SH DESCRIPTION
+The
+.BR libkeccak_hmac_create ()
+function allocates a new
+.I struct libkeccak_hmac_state *
+with one initialised element, and sets the
+algorithm tuning parameters to those specified by
+.IR *spec ,
+and the key to
+.I key
+of length
+.IR key_length .
+.SH RETURN VALUES
+The
+.BR libkeccak_hmac_create ()
+function returns a newly allocated
+.I struct libkeccak_hmac_state *
+(of one initialised element) upon successful completion.
+On error,
+.I NULL
+is returned and
+.I errno
+is set to describe the error.
+.SH ERRORS
+The
+.BR libkeccak_hmac_create ()
+function may fail for any specified for the functions
+.BR malloc (3)
+and
+.BR realloc (3).
+.SH SEE ALSO
+.BR libkeccak_hmac_initialise (3),
+.BR libkeccak_hmac_free (3),
+.BR libkeccak_hmac_fast_free (3),
+.BR libkeccak_hmac_duplicate (3)