Ensure the openssl and cryptography work under python3. (#438)

lemur/plugins/lemur_cryptography/plugin.py

@@ -51,7 +51,7 @@ def build_root_certificate(options):
 
     cert_pem = cert.public_bytes(
         encoding=serialization.Encoding.PEM
-    )
+    ).decode('utf-8')
 
     private_key_pem = private_key.private_bytes(
         encoding=serialization.Encoding.PEM,
@@ -82,7 +82,7 @@ def issue_certificate(csr, options):
     builder = builder.serial_number(int(uuid.uuid4()))
 
     private_key = serialization.load_pem_private_key(
-        options['authority'].authority_certificate.private_key,
+        bytes(options['authority'].authority_certificate.private_key, 'utf-8'),
         password=None,
         backend=default_backend()
     )
@@ -91,7 +91,7 @@ def issue_certificate(csr, options):
 
     return cert.public_bytes(
         encoding=serialization.Encoding.PEM
-    )
+    ).decode('utf-8')
 
 
 class CryptographyIssuerPlugin(IssuerPlugin):

lemur/plugins/lemur_openssl/plugin.py

@@ -60,7 +60,10 @@ def create_pkcs12(cert, chain, p12_tmp, key, alias, passphrase):
         # Create PKCS12 keystore from private key and public certificate
         with mktempfile() as cert_tmp:
             with open(cert_tmp, 'w') as f:
-                f.writelines([cert.strip() + "\n", chain.strip() + "\n"])
+                if chain:
+                    f.writelines([cert.strip() + "\n", chain.strip() + "\n"])
+                else:
+                    f.writelines([cert.strip() + "\n"])
 
             run_process([
                 "openssl",