first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/src/cmd/auth/dsa2pub.c

@@ -0,0 +1,44 @@
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+#include <mp.h>
+#include <libsec.h>
+#include "rsa2any.h"
+
+void
+usage(void)
+{
+	fprint(2, "usage: auth/dsa2pub [file]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	DSApriv *key;
+	Attr *a;
+	char *s;
+
+	fmtinstall('A', _attrfmt);
+	fmtinstall('B', mpfmt);
+	quotefmtinstall();
+
+	ARGBEGIN{
+	default:
+		usage();
+	}ARGEND
+
+	if(argc > 1)
+		usage();
+
+	if((key = getdsakey(argc, argv, 0, &a)) == nil)
+		sysfatal("%r");
+
+	s = smprint("key %A p=%B q=%B alpha=%B key=%B\n",
+		a, 
+		key->pub.p, key->pub.q, key->pub.alpha, key->pub.key);
+	if(s == nil)
+		sysfatal("smprint: %r");
+	write(1, s, strlen(s));
+	exits(nil);
+}