diff --git a/src/libauthsrv/convTR2M.c b/src/libauthsrv/convTR2M.c
new file mode 100644
index 0000000..3a7610a
--- /dev/null
+++ b/src/libauthsrv/convTR2M.c
@@ -0,0 +1,27 @@
+#include <u.h>
+#include <libc.h>
+#include <authsrv.h>
+
+#define	CHAR(x)		*p++ = f->x
+#define	SHORT(x)	p[0] = f->x; p[1] = f->x>>8; p += 2
+#define	VLONG(q)	p[0] = (q); p[1] = (q)>>8; p[2] = (q)>>16; p[3] = (q)>>24; p += 4
+#define	LONG(x)		VLONG(f->x)
+#define	STRING(x,n)	memmove(p, f->x, n); p += n
+
+int
+convTR2M(Ticketreq *f, char *ap)
+{
+	int n;
+	uchar *p;
+
+	p = (uchar*)ap;
+	CHAR(type);
+	STRING(authid, 28);	/* BUG */
+	STRING(authdom, DOMLEN);
+	STRING(chal, CHALLEN);
+	STRING(hostid, 28);	/* BUG */
+	STRING(uid, 28);	/* BUG */
+	n = p - (uchar*)ap;
+	return n;
+}
+