1 files changed, 37 insertions, 4 deletions
diff --git a/openssl/src/asn1/mod.rs b/openssl/src/asn1/mod.rs
index 7d209775..1eab9f04 100644
--- a/openssl/src/asn1/mod.rs
+++ b/openssl/src/asn1/mod.rs
@@ -1,15 +1,19 @@
 use libc::c_long;
-use std::ptr;
+use std::{ptr, fmt};
+use std::marker::PhantomData;
+use std::ops::Deref;
 
+use bio::MemBio;
 use ffi;
 use error::ErrorStack;
 
-pub struct Asn1Time(*mut ffi::ASN1_TIME);
+/// Corresponds to the ASN.1 structure Time defined in RFC5280
+pub struct Asn1Time(Asn1TimeRef<'static>);
 
 impl Asn1Time {
     /// Wraps existing ASN1_TIME and takes ownership
     pub unsafe fn from_ptr(handle: *mut ffi::ASN1_TIME) -> Asn1Time {
-        Asn1Time(handle)
+        Asn1Time(Asn1TimeRef::from_ptr(handle))
     }
 
     fn from_period(period: c_long) -> Result<Asn1Time, ErrorStack> {
@@ -25,6 +29,24 @@ impl Asn1Time {
     pub fn days_from_now(days: u32) -> Result<Asn1Time, ErrorStack> {
         Asn1Time::from_period(days as c_long * 60 * 60 * 24)
     }
+}
+
+impl Deref for Asn1Time {
+    type Target = Asn1TimeRef<'static>;
+
+    fn deref(&self) -> &Asn1TimeRef<'static> {
+        &self.0
+    }
+}
+
+/// A borrowed Asn1Time
+pub struct Asn1TimeRef<'a>(*mut ffi::ASN1_TIME, PhantomData<&'a ()>);
+
+impl<'a> Asn1TimeRef<'a> {
+    /// Creates a new `Asn1TimeRef` wrapping the provided handle.
+    pub unsafe fn from_ptr(handle: *mut ffi::ASN1_TIME) -> Asn1TimeRef<'a> {
+        Asn1TimeRef(handle, PhantomData)
+    }
 
     /// Returns the raw handle
     pub fn as_ptr(&self) -> *mut ffi::ASN1_TIME {
@@ -32,8 +54,19 @@ impl Asn1Time {
     }
 }
 
+impl<'a> fmt::Display for Asn1TimeRef<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mem_bio = try!(MemBio::new());
+        let as_str = unsafe {
+            try_ssl!(ffi::ASN1_TIME_print(mem_bio.as_ptr(), self.0));
+            String::from_utf8_unchecked(mem_bio.get_buf().to_owned())
+        };
+        write!(f, "{}", as_str)
+    }
+}
+
 impl Drop for Asn1Time {
     fn drop(&mut self) {
-        unsafe { ffi::ASN1_TIME_free(self.0) };
+        unsafe { ffi::ASN1_TIME_free(self.as_ptr()) };
     }
 }