rsa: add auth/rsa2asn1, check write error in auth/rsa2x509 and auth/rsa2pub, document in rsa(8)

1 files changed, 37 insertions, 0 deletions

diff --git a/sys/src/cmd/auth/rsa2asn1.c b/sys/src/cmd/auth/rsa2asn1.c
new file mode 100644
index 000000000..51f82282e
--- /dev/null
+++ b/sys/src/cmd/auth/rsa2asn1.c
@@ -0,0 +1,37 @@
+#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/rsa2asn1 [file]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	uchar buf[16*1024];
+	RSApriv *k;
+	int n;
+
+	ARGBEGIN{
+	default:
+		usage();
+	}ARGEND
+
+	if(argc > 1)
+		usage();
+
+	if((k = getrsakey(argc, argv, 0, nil)) == nil)
+		sysfatal("%r");
+	if((n = asn1encodeRSApub(&k->pub, buf, sizeof(buf))) < 0)
+		sysfatal("asn1encodeRSApub: %r");
+	if(write(1, buf, n) != n)
+		sysfatal("write: %r");
+	exits(nil);
+}