Expose RAND_bytes

crypto.rc

@@ -25,3 +25,4 @@ mod hash;
 mod pkey;
 mod symm;
 mod pkcs5;
+mod rand;

rand.rs

@@ -0,0 +1,28 @@
+import libc::{c_uchar, c_int};
+
+#[link_name = "crypto"]
+#[abi = "cdecl"]
+native mod _native {
+    fn RAND_bytes(buf: *c_uchar, num: c_int) -> c_int;
+}
+
+fn rand_bytes(len: uint) -> [u8] {
+    let mut out = [];
+    vec::reserve(out, len);
+
+    vec::as_buf(out) { |out_buf|
+        let r = _native::RAND_bytes(out_buf, len as c_int);
+        if r != 1 as c_int { fail }
+
+        unsafe { vec::unsafe::set_len(out, len); }
+        out
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_rand_bytes() {
+        let _bytes = rand_bytes(5u);
+    }
+}