Progress on asn1 expiry

- Use MemBio and implement `Display` for Asn1Time

- Tweak doc for asn1 `not_before`, `not_after`

1 files changed, 13 insertions, 0 deletions

diff --git a/openssl/src/asn1/mod.rs b/openssl/src/asn1/mod.rs
index 7d209775..40b6e0f7 100644
--- a/openssl/src/asn1/mod.rs
+++ b/openssl/src/asn1/mod.rs
@@ -1,10 +1,12 @@
 use libc::c_long;
 use std::ptr;
+use std::fmt;
 
 use ffi;
 use error::ErrorStack;
 
 pub struct Asn1Time(*mut ffi::ASN1_TIME);
+use bio::MemBio;
 
 impl Asn1Time {
     /// Wraps existing ASN1_TIME and takes ownership
@@ -32,6 +34,17 @@ impl Asn1Time {
     }
 }
 
+impl fmt::Display for Asn1Time {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mem_bio = try!(MemBio::new());
+        let as_str = unsafe {
+            ffi::ASN1_TIME_print(mem_bio.handle(), self.handle);
+            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) };