Add ToPem() to public keys

This was missing before from all public keys.

1 files changed, 1 insertions, 0 deletions

diff --git a/types.go b/types.go
index 53db1a9..f2c6902 100644
--- a/types.go
+++ b/types.go
@@ -45,6 +45,7 @@ type (
 	// same functionality like verifying a message against a signature.
 	PublicKey interface {
 		Pemmer
+		PemOutput
 		// This function can be used to verify a message against a provided signature
 		// using the given hash function.
 		Verify(message []byte, signature []byte, hash crypto.Hash) (bool, error)