Switch to rand_os for random bytes.

sasl/src/error.rs

@@ -1,19 +1,19 @@
 #[cfg(feature = "scram")]
-use openssl::error::ErrorStack;
+use rand_os::rand_core::Error as RngError;
 
 /// A wrapper enum for things that could go wrong in this crate.
 #[derive(Debug)]
 pub enum Error {
     #[cfg(feature = "scram")]
-    /// An error in OpenSSL.
-    OpenSslErrorStack(ErrorStack),
+    /// An error while initializing the Rng.
+    RngError(RngError),
     /// An error in a SASL mechanism.
     SaslError(String),
 }
 
 #[cfg(feature = "scram")]
-impl From<ErrorStack> for Error {
-    fn from(err: ErrorStack) -> Error {
-        Error::OpenSslErrorStack(err)
+impl From<RngError> for Error {
+    fn from(err: RngError) -> Error {
+        Error::RngError(err)
     }
 }