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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/asn12dsa [-t tag] [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 *s;
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	uchar *buf;
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	int fd;
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	long n, tot;
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	char *tag, *file;
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	DSApriv *key;
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	fmtinstall('B', mpfmt);
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	tag = nil;
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	ARGBEGIN{
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	case 't':
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		tag = EARGF(usage());
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		break;
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	default:
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		usage();
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	}ARGEND
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	if(argc != 0 && argc != 1)
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		usage();
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	if(argc == 1)
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		file = argv[0];
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	else
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		file = "/dev/stdin";
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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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	key = asn1toDSApriv(buf, tot);
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	if(key == nil)
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		sysfatal("couldn't parse asn1 key");
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	s = smprint("key proto=dsa %s%sp=%B q=%B alpha=%B key=%B !secret=%B\n",
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		tag ? tag : "", tag ? " " : "",
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		key->pub.p, key->pub.q, key->pub.alpha, key->pub.key,
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		key->secret);
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	if(s == nil)
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		sysfatal("smprint: %r");
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	write(1, s, strlen(s));
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	exits(0);
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}