diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 28db754a..ac1891aa 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -50,6 +50,9 @@ pub struct EVP_MD_CTX {
 }
 
 impl Copy for EVP_MD_CTX {}
+impl Clone for EVP_MD_CTX {
+    fn clone(&self) -> EVP_MD_CTX { *self }
+}
 
 #[repr(C)]
 pub struct HMAC_CTX {
@@ -62,6 +65,9 @@ pub struct HMAC_CTX {
 }
 
 impl Copy for HMAC_CTX {}
+impl Clone for HMAC_CTX {
+    fn clone(&self) -> HMAC_CTX { *self }
+}
 
 #[repr(C)]
 pub struct X509V3_CTX {
@@ -77,6 +83,9 @@ pub struct X509V3_CTX {
 }
 
 impl Copy for X509V3_CTX {}
+impl Clone for X509V3_CTX {
+    fn clone(&self) -> X509V3_CTX { *self }
+}
 
 #[repr(C)]
 pub struct BIGNUM {
@@ -88,6 +97,9 @@ pub struct BIGNUM {
 }
 
 impl Copy for BIGNUM {}
+impl Clone for BIGNUM {
+    fn clone(&self) -> BIGNUM { *self }
+}
 
 pub type CRYPTO_EX_new = extern "C" fn(parent: *mut c_void, ptr: *mut c_void,
                                        ad: *const CRYPTO_EX_DATA, idx: c_int,
diff --git a/openssl/src/bn/mod.rs b/openssl/src/bn/mod.rs
index 795788fa..ccf28337 100644
--- a/openssl/src/bn/mod.rs
+++ b/openssl/src/bn/mod.rs
@@ -8,7 +8,7 @@ use ssl::error::SslError;
 
 pub struct BigNum(*mut ffi::BIGNUM);
 
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 #[repr(C)]
 pub enum RNGProperty {
     MsbMaybeZero = -1,
@@ -196,7 +196,7 @@ impl BigNum {
     pub fn div_word(&mut self, w: c_ulong) -> Result<c_ulong, SslError> {
         unsafe {
             let result = ffi::BN_div_word(self.raw(), w);
-            if result != -1 as c_ulong {
+            if result != !0 as c_ulong {
                 Ok(result)
             } else {
                 Err(SslError::get())
@@ -207,7 +207,7 @@ impl BigNum {
     pub fn mod_word(&self, w: c_ulong) -> Result<c_ulong, SslError> {
         unsafe {
             let result = ffi::BN_mod_word(self.raw(), w);
-            if result != -1 as c_ulong {
+            if result != !0 as c_ulong {
                 Ok(result)
             } else {
                 Err(SslError::get())
diff --git a/openssl/src/crypto/hash.rs b/openssl/src/crypto/hash.rs
index 29e180e5..801d8ca5 100644
--- a/openssl/src/crypto/hash.rs
+++ b/openssl/src/crypto/hash.rs
@@ -6,7 +6,7 @@ use std::io;
 use ffi;
 
 /// Message digest (hash) type.
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub enum Type {
     MD5,
     SHA1,
@@ -51,7 +51,7 @@ impl Type {
     }
 }
 
-#[derive(PartialEq, Copy)]
+#[derive(PartialEq, Copy, Clone)]
 enum State {
     Reset,
     Updated,
diff --git a/openssl/src/crypto/hmac.rs b/openssl/src/crypto/hmac.rs
index dace68aa..a59cb929 100644
--- a/openssl/src/crypto/hmac.rs
+++ b/openssl/src/crypto/hmac.rs
@@ -22,7 +22,7 @@ use std::io::prelude::*;
 use crypto::hash::Type;
 use ffi;
 
-#[derive(PartialEq, Copy)]
+#[derive(PartialEq, Copy, Clone)]
 enum State {
     Reset,
     Updated,
diff --git a/openssl/src/crypto/pkey.rs b/openssl/src/crypto/pkey.rs
index e23171ed..9bcc79b6 100644
--- a/openssl/src/crypto/pkey.rs
+++ b/openssl/src/crypto/pkey.rs
@@ -9,7 +9,7 @@ use crypto::hash::Type as HashType;
 use ffi;
 use ssl::error::{SslError, StreamError};
 
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 enum Parts {
     Neither,
     Public,
@@ -17,7 +17,7 @@ enum Parts {
 }
 
 /// Represents a role an asymmetric key might be appropriate for.
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub enum Role {
     Encrypt,
     Decrypt,
@@ -26,7 +26,7 @@ pub enum Role {
 }
 
 /// Type of encryption padding to use.
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub enum EncryptionPadding {
     OAEP,
     PKCS1v15
diff --git a/openssl/src/crypto/symm.rs b/openssl/src/crypto/symm.rs
index e8bbcf80..62208439 100644
--- a/openssl/src/crypto/symm.rs
+++ b/openssl/src/crypto/symm.rs
@@ -3,14 +3,14 @@ use libc::{c_int};
 
 use ffi;
 
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub enum Mode {
     Encrypt,
     Decrypt,
 }
 
 #[allow(non_camel_case_types)]
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub enum Type {
     AES_128_ECB,
     AES_128_CBC,
diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index bce9485e..c19f093d 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -20,7 +20,7 @@ use ssl::error::{SslError, StreamError};
 #[cfg(test)]
 mod tests;
 
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 #[repr(i32)]
 pub enum X509FileType {
     PEM = ffi::X509_FILETYPE_PEM,
@@ -449,7 +449,7 @@ pub struct X509Name<'x> {
 
 macro_rules! make_validation_error(
     ($ok_val:ident, $($name:ident = $val:ident,)+) => (
-        #[derive(Copy)]
+        #[derive(Copy, Clone)]
         pub enum X509ValidationError {
             $($name,)+
             X509UnknownError(c_int)