Add Debug trait for X509 and other types.

This currently leaves out at least two useful things:
 - The detailed SubjectPublicKeyInfo, e.g. the modulus of RSA keys.
 - Extensions.

1 files changed, 22 insertions, 0 deletions

diff --git a/openssl/src/pkey.rs b/openssl/src/pkey.rs
index 2dfa95c6..7af13c09 100644
--- a/openssl/src/pkey.rs
+++ b/openssl/src/pkey.rs
@@ -49,6 +49,7 @@ use ffi;
 use foreign_types::{ForeignType, ForeignTypeRef};
 use libc::{c_int, c_long};
 use std::ffi::CString;
+use std::fmt;
 use std::mem;
 use std::ptr;
 
@@ -286,6 +287,27 @@ where
     }
 }
 
+impl<T> fmt::Debug for PKey<T> {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let alg = match self.id() {
+            Id::RSA => "RSA",
+            Id::HMAC => "HMAC",
+            Id::DSA => "DSA",
+            Id::DH => "DH",
+            Id::EC => "EC",
+            #[cfg(ossl111)]
+            Id::ED25519 => "Ed25519",
+            #[cfg(ossl111)]
+            Id::ED448 => "Ed448",
+            _ => "unknown",
+        };
+        fmt.debug_struct("public_key")
+            .field("algorithm", &alg)
+            .finish()
+        // TODO: Print details for each specific type of key
+    }
+}
+
 impl<T> Clone for PKey<T> {
     fn clone(&self) -> PKey<T> {
         PKeyRef::to_owned(self)