commit all the code!

[detour.git] / devurandom.c

diff --git a/devurandom.c b/devurandom.c
new file mode 100644 (file)
index 0000000..8a7a7b6
--- /dev/null
+++ b/devurandom.c
@@ -0,0 +1,35 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+/* it's really stupid that there isn't a syscall for this */
+
+static int fd = -1;
+
+void randombytes(void *x_,unsigned long long xlen)
+{
+  unsigned char *x = x_;
+  int i;
+
+  if (fd == -1) {
+    for (;;) {
+      fd = open("/dev/urandom",O_RDONLY);
+      if (fd != -1) break;
+      sleep(1);
+    }
+  }
+
+  while (xlen > 0) {
+    if (xlen < 1048576) i = xlen; else i = 1048576;
+
+    i = read(fd,x,i);
+    if (i < 1) {
+      sleep(1);
+      continue;
+    }
+
+    x += i;
+    xlen -= i;
+  }
+}