1 files changed, 22 insertions, 1 deletions
diff --git a/hbbp_keygen.c b/hbbp_keygen.c
index 6bcde5c..f464441 100644
--- a/hbbp_keygen.c
+++ b/hbbp_keygen.c
@@ -2,9 +2,9 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
+#include "common.h"
 #include "crypto.h"
 
-
 #define pub_len  crypto_box_PUBLICKEYBYTES
 #define priv_len crypto_box_SECRETKEYBYTES
 
@@ -16,6 +16,27 @@ void error_cleanup(int num) {
     exit(1);
 }
 
+// used by nacl's crypto_box_keypair
+void randombytes(byte *buf, unsigned long long len)
+  __attribute__ ((externally_visible));
+
+void randombytes(byte *buf, unsigned long long len) {
+  int fd = open("/dev/urandom", O_RDONLY);
+  if (fd == -1) goto error;
+
+  while (len > 0) {
+    int sz = read(fd, buf, len);
+    if (sz < 1) goto error;
+    buf += sz;
+    len -= sz;
+  }
+  return;
+
+ error:
+  perror("failed accessing /dev/urandom");
+  error_cleanup(4);
+}
+
 int main() {
   int fd[4], i;
   byte key_pub [2][pub_len],