Update to rand v0.6

This patch updates the rand dependecy to version 0.6.  It also replaces
the OsRng, which is guaranteed to use OS/hardware entropy, with the
thread_rng, which is likely to use OS/hardware entropy as a seed.  The
choice of RNG and the handling of password should be reviewed at a later
point.

2 files changed, 5 insertions, 10 deletions

diff --git a/Cargo.toml b/Cargo.toml
index f3560a2..663e596 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,4 +19,4 @@ test-storage = []
 [dependencies]
 libc = "0.2"
 nitrokey-sys = "3.4.1"
-rand = "0.4"
+rand = "0.6"
diff --git a/src/util.rs b/src/util.rs
index 2a75634..d98e675 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,11 +1,10 @@
-use libc::{c_void, free};
-use nitrokey_sys;
-use rand::{OsRng, Rng};
-use std;
 use std::ffi::{CStr, CString};
 use std::fmt;
 use std::os::raw::{c_char, c_int};
 
+use libc::{c_void, free};
+use rand::Rng;
+
 /// Error types returned by Nitrokey device or by the library.
 #[derive(Debug, PartialEq)]
 pub enum CommandError {
@@ -101,12 +100,8 @@ pub fn get_last_error() -> CommandError {
 }
 
 pub fn generate_password(length: usize) -> std::io::Result<Vec<u8>> {
-    let mut rng = match OsRng::new() {
-        Ok(rng) => rng,
-        Err(err) => return Err(err),
-    };
     let mut data = vec![0u8; length];
-    rng.fill_bytes(&mut data[..]);
+    rand::thread_rng().fill(&mut data[..]);
     return Ok(data);
 }