tasn12dsa.c - plan9port - [fork] Plan 9 from user space
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tasn12dsa.c (1147B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include <mp.h>
5 #include <libsec.h>
6
7 void
8 usage(void)
9 {
10 fprint(2, "auth/asn12dsa [-t tag] [file]\n");
11 exits("usage");
12 }
13
14 void
15 main(int argc, char **argv)
16 {
17 char *s;
18 uchar *buf;
19 int fd;
20 long n, tot;
21 char *tag, *file;
22 DSApriv *key;
23
24 fmtinstall('B', mpfmt);
25
26 tag = nil;
27 ARGBEGIN{
28 case 't':
29 tag = EARGF(usage());
30 break;
31 default:
32 usage();
33 }ARGEND
34
35 if(argc != 0 && argc != 1)
36 usage();
37
38 if(argc == 1)
39 file = argv[0];
40 else
41 file = "/dev/stdin";
42
43 if((fd = open(file, OREAD)) < 0)
44 sysfatal("open %s: %r", file);
45 buf = nil;
46 tot = 0;
47 for(;;){
48 buf = realloc(buf, tot+8192);
49 if(buf == nil)
50 sysfatal("realloc: %r");
51 if((n = read(fd, buf+tot, 8192)) < 0)
52 sysfatal("read: %r");
53 if(n == 0)
54 break;
55 tot += n;
56 }
57
58 key = asn1toDSApriv(buf, tot);
59 if(key == nil)
60 sysfatal("couldn't parse asn1 key");
61
62 s = smprint("key proto=dsa %s%sp=%lB q=%lB alpha=%lB key=%lB !secret=%lB\n",
63 tag ? tag : "", tag ? " " : "",
64 key->pub.p, key->pub.q, key->pub.alpha, key->pub.key,
65 key->secret);
66 if(s == nil)
67 sysfatal("smprint: %r");
68 write(1, s, strlen(s));
69 exits(0);
70 }