#include <u.h>#include <libc.h>#include <bio.h>#include <auth.h>#include <mp.h>#include <libsec.h>#include "rsa2any.h" voidusage(void){	fprint(2, "usage: aux/rsa2csr 'C=US ...CN=xxx' [key]");	exits("usage");} voidmain(int argc, char **argv){	int len;	uchar *cert;	RSApriv *key; 	fmtinstall('B', mpfmt);	fmtinstall('H', encodefmt); 	ARGBEGIN{	default:		usage();	}ARGEND 	if(argc != 1 && argc != 2)		usage(); 	if((key = getkey(argc-1, argv+1, 1, nil)) == nil)		sysfatal("%r"); 	cert = X509req(key, argv[0], &len);	if(cert == nil)		sysfatal("X509req: %r"); 	write(1, cert, len);	exits(0);}