harvey/sys/src/cmd/auth/pemencode.c

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mp.h>
#include <libsec.h>

void
usage(void)
{
	fprint(2, "auth/pemdecode section [file]\n");
	exits("usage");
}

void
main(int argc, char **argv)
{
	char *buf, *cbuf;
	int fd;
	long n, tot;
	int len;
	char *tag, *file;

	ARGBEGIN{
	default:
		usage();
	}ARGEND

	if(argc != 1 && argc != 2)
		usage();

	tag = argv[0];
	if(argc == 2)
		file = argv[1];
	else
		file = "#d/0";

	if((fd = open(file, OREAD)) < 0)
		sysfatal("open %s: %r", file);
	buf = nil;
	tot = 0;
	for(;;){
		buf = realloc(buf, tot+8192);
		if(buf == nil)
			sysfatal("realloc: %r");
		if((n = read(fd, buf+tot, 8192)) < 0)
			sysfatal("read: %r");
		if(n == 0)
			break;
		tot += n;
	}
	buf[tot] = 0;
	cbuf = malloc(2*tot);
	if(cbuf == nil)
		sysfatal("malloc: %r");
	len = enc64(cbuf, 2*tot, (uchar*)buf, tot);
	print("-----BEGIN %s-----\n", tag);
	while(len > 0){
		print("%.64s\n", cbuf);
		cbuf += 64;
		len -= 64;
	}
	print("-----END %s-----\n", tag);
	exits(0);
}