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-.TH LIBKECCAK_UNHEX 3 LIBKECCAK
-.SH NAME
-libkeccak_unhex - Converts a hexadecimal hashsum to binary
-.SH SYNOPSIS
-.nf
-#include <libkeccak.h>
-
-void libkeccak_unhex(void *restrict \fIoutput\fP, const char *restrict \fIhashsum\fP);
-.fi
-.PP
-Link with
-.IR -lkeccak .
-.SH DESCRIPTION
-The
-.BR libkeccak_unhex ()
-function
-converts a hexadecimal hashsum, stored in
-.IR hashsum ,
-to binary, and stores the binary representation in
-.IR output .
-.PP
-.I hashsum
-must be terminated by a NUL-character. It may be
-in either lowercase or uppercase, or a mixture
-thereof.
-.I output
-will not be terminated.
-.PP
-(\fBstrlen\fP(\fIhashsum\fP) / 2) bytes will be
-written to the beginning of
-.IR Ioutput .
-It should therefore have an allocation of at least
-that number of bytes.
-.SH RETURN VALUES
-The
-.BR libkeccak_unhex ()
-function does return any value.
-.SH ERRORS
-The
-.BR libkeccak_unhex ()
-function cannot fail.
-.SH NOTES
-.I hashsum
-must have an even number of digits
-(characters excluding the terminating NUL-character.)
-.SH SEE ALSO
-.BR libkeccak_behex_lower (3),
-.BR libkeccak_behex_upper (3)