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+.TH LIBSHA2_UNHEX 3 2019-02-09 libjson
+.SH NAME
+libsha2_unhex \- Covert hexadecimal to binary
+.SH SYNOPSIS
+.nf
+#include <libsha2.h>
+
+void libsha2_unhex(char *restrict \fIoutput\fP, const char *restrict \fIhashsum\fP);
+.fi
+.PP
+Link with
+.IR \-lsha2 .
+.SH DESCRIPTION
+The
+.BR libsha2_unhex ()
+function converts the content of the string
+.I hashsum
+to binary and stores the result in
+.IR output .
+.PP
+The user must make sure that
+.I hashsum
+is a NUL terminated string with an even number of characters
+and each character is a hexadecimal digit (both lower case
+and upper case, including mixing, is allowed). The output will
+be half the length of this string, and the user must make sure
+that
+.I output
+is at least this size.
+.SH RETURN VALUE
+None.
+.SH ERRORS
+None.
+.SH EXAMPLES
+None.
+.SH APPLICATION USAGE
+None.
+.SH RATIONALE
+None.
+.SH FUTURE DIRECTIONS
+None.
+.SH NOTES
+None.
+.SH BUGS
+None.
+.SH SEE ALSO
+.BR libsha2_behex_lower (3),
+.BR libsha2_behex_upper (3)