diff --git a/openssl/src/asn1.rs b/openssl/src/asn1.rs
index 9a83a5da..a089b41b 100644
--- a/openssl/src/asn1.rs
+++ b/openssl/src/asn1.rs
@@ -1,30 +1,15 @@
 use libc::c_long;
 use std::{ptr, fmt};
-use std::ops::Deref;
-
 use ffi;
-use opaque::Opaque;
 
 use {cvt, cvt_p};
 use bio::MemBio;
 use error::ErrorStack;
+use types::{OpenSslType, Ref};
 
-/// A borrowed Asn1Time
-pub struct Asn1TimeRef(Opaque);
+type_!(Asn1Time, ffi::ASN1_TIME, ffi::ASN1_TIME_free);
 
-impl Asn1TimeRef {
-    /// Creates a new `Asn1TimeRef` wrapping the provided handle.
-    pub unsafe fn from_ptr<'a>(handle: *mut ffi::ASN1_TIME) -> &'a Asn1TimeRef {
-        &*(handle as *mut _)
-    }
-
-    /// Returns the raw handle
-    pub fn as_ptr(&self) -> *mut ffi::ASN1_TIME {
-        self as *const _ as *mut _
-    }
-}
-
-impl fmt::Display for Asn1TimeRef {
+impl fmt::Display for Ref<Asn1Time> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mem_bio = try!(MemBio::new());
         let as_str = unsafe {
@@ -35,16 +20,7 @@ impl fmt::Display for Asn1TimeRef {
     }
 }
 
-
-/// Corresponds to the ASN.1 structure Time defined in RFC5280
-pub struct Asn1Time(*mut ffi::ASN1_TIME);
-
 impl Asn1Time {
-    /// Wraps existing ASN1_TIME and takes ownership
-    pub unsafe fn from_ptr(handle: *mut ffi::ASN1_TIME) -> Asn1Time {
-        Asn1Time(handle)
-    }
-
     fn from_period(period: c_long) -> Result<Asn1Time, ErrorStack> {
         ffi::init();
 
@@ -59,17 +35,3 @@ impl Asn1Time {
         Asn1Time::from_period(days as c_long * 60 * 60 * 24)
     }
 }
-
-impl Deref for Asn1Time {
-    type Target = Asn1TimeRef;
-
-    fn deref(&self) -> &Asn1TimeRef {
-        unsafe { Asn1TimeRef::from_ptr(self.0) }
-    }
-}
-
-impl Drop for Asn1Time {
-    fn drop(&mut self) {
-        unsafe { ffi::ASN1_TIME_free(self.as_ptr()) };
-    }
-}
diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index b49a9848..8a4941ea 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -14,7 +14,6 @@ use std::str;
 
 use {cvt, cvt_p};
 use asn1::Asn1Time;
-use asn1::Asn1TimeRef;
 use bio::{MemBio, MemBioSlice};
 use crypto::CryptoString;
 use hash::MessageDigest;
@@ -24,6 +23,7 @@ use error::ErrorStack;
 use ffi;
 use nid::Nid;
 use opaque::Opaque;
+use types::Ref;
 
 #[cfg(ossl10x)]
 use ffi::{X509_set_notBefore, X509_set_notAfter, ASN1_STRING_data};
@@ -401,20 +401,20 @@ impl X509Ref {
     }
 
     /// Returns certificate Not After validity period.
-    pub fn not_after<'a>(&'a self) -> &'a Asn1TimeRef {
+    pub fn not_after<'a>(&'a self) -> &'a Ref<Asn1Time> {
         unsafe {
             let date = compat::X509_get_notAfter(self.as_ptr());
             assert!(!date.is_null());
-            Asn1TimeRef::from_ptr(date)
+            Ref::from_ptr(date)
         }
     }
 
     /// Returns certificate Not Before validity period.
-    pub fn not_before<'a>(&'a self) -> &'a Asn1TimeRef {
+    pub fn not_before<'a>(&'a self) -> &'a Ref<Asn1Time> {
         unsafe {
             let date = compat::X509_get_notBefore(self.as_ptr());
             assert!(!date.is_null());
-            Asn1TimeRef::from_ptr(date)
+            Ref::from_ptr(date)
         }
     }