+static void random_exit(void) {
+ close(random_fd);
+}
+
+void randomize(void *vout, size_t outlen) {
+ uint8_t *out = vout;
+
+ while(outlen) {
+ ssize_t len = read(random_fd, out, outlen);
+
+ if(len <= 0) {
+ if(len == -1 && (errno == EAGAIN || errno == EINTR)) {
+ continue;
+ }
+
+ fprintf(stderr, "Could not read random numbers: %s\n", strerror(errno));
+ abort();
+ }
+
+ out += len;
+ outlen -= len;
+ }
+}
+
+#else
+
+#include <wincrypt.h>
+HCRYPTPROV prov;
+
+static void random_init(void) {
+ if(!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
+ fprintf(stderr, "CryptAcquireContext() failed!\n");
+ abort();
+ }
+}
+
+static void random_exit(void) {
+ CryptReleaseContext(prov, 0);