asn12dsa.c (1147B)
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 }