Use VecDeque and pop from wrong when iterating

The order was reversed after parsing a cert.

Author: da-kami

rcgen/src/lib.rs

@@ -33,6 +33,7 @@ println!("{}", key_pair.serialize_pem());
 #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
 #![warn(unreachable_pub)]
 
+use std::collections::VecDeque;
 use std::fmt;
 use std::hash::Hash;
 use std::net::IpAddr;
@@ -298,7 +299,7 @@ See also the RFC 5280 sections on the [issuer](https://tools.ietf.org/html/rfc52
 and [subject](https://tools.ietf.org/html/rfc5280#section-4.1.2.6) fields.
 */
 pub struct DistinguishedName {
-	entries: Vec<(DnType, DnValue)>,
+	entries: VecDeque<(DnType, DnValue)>,
 }
 
 impl DistinguishedName {
@@ -345,7 +346,7 @@ impl DistinguishedName {
 	/// assert_eq!(dn.get(&DnType::CommonName).get(0), Some(&DnValue::PrintableString("Master Cert".try_into().unwrap())).as_ref());
 	/// ```
 	pub fn push(&mut self, ty: DnType, s: impl Into<DnValue>) {
-		self.entries.push((ty, s.into()));
+		self.entries.push_front((ty, s.into()));
 	}
 
 	#[cfg(feature = "x509-parser")]
@@ -397,7 +398,7 @@ impl Iterator for DistinguishedName {
 	type Item = (DnType, DnValue);
 
 	fn next(&mut self) -> Option<Self::Item> {
-		self.entries.pop()
+		self.entries.pop_back()
 	}
 
 	fn size_hint(&self) -> (usize, Option<usize>) {