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- #include <u.h>
- #include <libc.h>
- #include <bio.h>
- #include <mp.h>
- #include <libsec.h>
- void
- usage(void)
- {
- fprint(2, "auth/asn12dsa [-t tag] [file]\n");
- exits("usage");
- }
- void
- main(int argc, char **argv)
- {
- char *s;
- uchar *buf;
- int fd;
- long n, tot;
- char *tag, *file;
- DSApriv *key;
- fmtinstall('B', mpfmt);
- tag = nil;
- ARGBEGIN{
- case 't':
- tag = EARGF(usage());
- break;
- default:
- usage();
- }ARGEND
- if(argc != 0 && argc != 1)
- usage();
- if(argc == 1)
- file = argv[0];
- else
- file = "/dev/stdin";
- 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;
- }
- key = asn1toDSApriv(buf, tot);
- if(key == nil)
- sysfatal("couldn't parse asn1 key");
- s = smprint("key proto=dsa %s%sp=%B q=%B alpha=%B key=%B !secret=%B\n",
- tag ? tag : "", tag ? " " : "",
- key->pub.p, key->pub.q, key->pub.alpha, key->pub.key,
- key->secret);
- if(s == nil)
- sysfatal("smprint: %r");
- write(1, s, strlen(s));
- exits(0);
- }
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