+static void cdebug(int mechno /*or -1*/, const char *msg) {
+ if (!crypto_debug) return;
+ printf("%s: CRYPTO: %-20s encrypt setup\n",
+ programid,
+ mechno >= 0 ? mechs[i]->name : "",
+ msg);
+}
+
+static void cdebughex(int mechno /*or -1*/, const char *msg,
+ size_t skipbefore, const void *ptr, size_t sz, size_t skipafter) {
+ const unsigned char *p;
+
+ if (!crypto_debug) return;
+ printf("%s: CRYPTO: %-20s %s",
+ programid,
+ mechno >= 0 ? mechs[i]->name : "",
+ msg);
+ for (i=0; i<skipbefore) fputs(" ..",stdout);
+ for (i=0, p=ptr; i<sz; i++, p++) fprintf(" %02x",*p);
+ for (i=0; i<skipafter) fputs(" ..",stdout);
+ fputc('\n',stdout);
+}
+
+void get_random(void *ptr, size_t sz) {
+ static FILE *randfile;
+
+ size_t r;
+
+ if (!randfile) {
+ randfile= fopen("/dev/urandom","rb");
+ if (!randfile && errno==ENOENT) randfile= fopen("/dev/random","rb");
+ if (!randfile) sysfail("open random number generator");
+ }
+
+ r= fread(ptr,1,sz,randfile);
+ if (r == sz) return;
+ (ferror(randfile) ? sysfail : fail)("cannot read random number generator");
+
+ cdebughex(-1, "get_random", ptr, sz, 0,0);
+}