fix deprecation warnings

Author: sfackler

src/imp/openssl.rs

@@ -159,14 +159,14 @@ pub struct Identity {
 impl Identity {
     pub fn from_pkcs12(buf: &[u8], pass: &str) -> Result<Identity, Error> {
         let pkcs12 = Pkcs12::from_der(buf)?;
-        let parsed = pkcs12.parse(pass)?;
+        let parsed = pkcs12.parse2(pass)?;
         Ok(Identity {
-            pkey: parsed.pkey,
-            cert: parsed.cert,
+            pkey: parsed.pkey.ok_or_else(|| Error::EmptyChain)?,
+            cert: parsed.cert.ok_or_else(|| Error::EmptyChain)?,
             // > The stack is the reverse of what you might expect due to the way
             // > PKCS12_parse is implemented, so we need to load it backwards.
             // > https://github.com/sfackler/rust-native-tls/commit/05fb5e583be589ab63d9f83d986d095639f8ec44
-            chain: parsed.chain.into_iter().flatten().rev().collect(),
+            chain: parsed.ca.into_iter().flatten().rev().collect(),
         })
     }