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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <mp.h>
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#include <libsec.h>
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void
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usage(void)
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{
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	fprint(2, "auth/pemdecode section [file]\n");
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	exits("usage");
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}
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void
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main(int argc, char **argv)
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{
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	char *buf;
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	uchar *bin;
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	int fd;
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	long n, tot;
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	int len;
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	char *tag, *file;
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	ARGBEGIN{
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	default:
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		usage();
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	}ARGEND
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	if(argc != 1 && argc != 2)
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		usage();
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	tag = argv[0];
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	if(argc == 2)
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		file = argv[1];
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	else
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		file = "#d/0";
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	if((fd = open(file, OREAD)) < 0)
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		sysfatal("open %s: %r", file);
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	buf = nil;
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	tot = 0;
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	for(;;){
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		buf = realloc(buf, tot+8192);
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		if(buf == nil)
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			sysfatal("realloc: %r");
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		if((n = read(fd, buf+tot, 8192)) < 0)
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			sysfatal("read: %r");
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		if(n == 0)
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			break;
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		tot += n;
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	}
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	buf[tot] = 0;
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	bin = decodePEM(buf, tag, &len, nil);
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	if(bin == nil)
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		sysfatal("cannot extract section '%s' from pem", tag);
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	if((n=write(1, bin, len)) != len)
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		sysfatal("writing %d bytes got %ld: %r", len, n);
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	exits(0);
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}