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+.TH LIBKECCAK_UNHEX 3 LIBKECCAK
+.SH NAME
+libkeccak_unhex - Converts a hexadecimal hashsum to binary
+.SH SYNOPSIS
+.LP
+.nf
+#include <libkeccak.h>
+.P
+void
+libkeccak_unhex(char *restrict \fIoutput\fP, const char *restrict \fIhashsum\fP);
+.fi
+.P
+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)
+.SH BUGS
+Please report bugs to https://github.com/maandree/libkeccak/issues or to
+maandree@kth.se