minimal plan9port to cross-build Jehanne

lib/lib9/netcrypt.c

@@ -0,0 +1,18 @@
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+
+int
+netcrypt(void *key, void *chal)
+{
+	uchar buf[8], *p;
+
+	strncpy((char*)buf, chal, 7);
+	buf[7] = '\0';
+	for(p = buf; *p && *p != '\n'; p++)
+		;
+	*p = '\0';
+	encrypt(key, buf, 8);
+	sprint(chal, "%.2ux%.2ux%.2ux%.2ux", buf[0], buf[1], buf[2], buf[3]);
+	return 1;
+}