void crypto_init(void) {
random_fd = open("/dev/urandom", O_RDONLY);
- if(random_fd < 0)
+
+ if(random_fd < 0) {
random_fd = open("/dev/random", O_RDONLY);
+ }
+
if(random_fd < 0) {
fprintf(stderr, "Could not open source of random numbers: %s\n", strerror(errno));
abort();
close(random_fd);
}
+void randomize(void *out, size_t outlen) {
+ char *ptr = out;
+
+ while(outlen) {
+ size_t len = read(random_fd, ptr, outlen);
+
+ if(len <= 0) {
+ if(errno == EAGAIN || errno == EINTR) {
+ continue;
+ }
+
+ fprintf(stderr, "Could not read random numbers: %s\n", strerror(errno));
+ abort();
+ }
+
+ ptr += len;
+ outlen -= len;
+ }
+}
+
#else
#include <wincrypt.h>