#include <u.h>#include <libc.h>#include <auth.h>#include <mp.h>#include <libsec.h>#include "rsa2any.h" voidusage(void){	fprint(2, "usage: auth/rsa2ssh [-c comment] [file]\n");	exits("usage");} voidmain(int argc, char **argv){	RSApriv *k;	char *comment, *s;	uchar buf[8192], *p; 	fmtinstall('B', mpfmt);	fmtinstall('[', encodefmt); 	comment = ""; 	ARGBEGIN{	case 'c':		comment = EARGF(usage());		break;	case '2':	/* backwards compatibility */		break;	default:		usage();	}ARGEND 	if(argc > 1)		usage(); 	if((k = getrsakey(argc, argv, 0, nil)) == nil)		sysfatal("%r"); 	p = buf;	p = put4(p, 7);	p = putn(p, "ssh-rsa", 7);	p = putmp2(p, k->pub.ek);	p = putmp2(p, k->pub.n); 	s = smprint("ssh-rsa %.*[ %s\n", (int)(p-buf), buf, comment);	if(s == nil)		sysfatal("smprint: %r");	if(write(1, s, strlen(s)) != strlen(s))		sysfatal("write: %r"); 	exits(nil);}