Fixing a couple of bugs in RSA signing.

2 files changed, 4 insertions, 1 deletions

diff --git a/oauthlib/oauth.py b/oauthlib/oauth.py
index 847ec0a..11850db 100644
--- a/oauthlib/oauth.py
+++ b/oauthlib/oauth.py
@@ -37,6 +37,9 @@ class OAuthClient(object):
         self.rsa_key = rsa_key
         self.verifier = verifier
 
+        if self.signature_method == SIGNATURE_RSA and self.rsa_key is None:
+            raise ValueError('rsa_key is required when using RSA signature method.')
+
     def get_oauth_signature(self, uri, http_method=u'GET', body=None,
             authorization_header=None):
         """Get an OAuth signature to be used in signing a request"""
diff --git a/oauthlib/signature.py b/oauthlib/signature.py
index b1c5223..1499dfa 100644
--- a/oauthlib/signature.py
+++ b/oauthlib/signature.py
@@ -137,7 +137,7 @@ def sign_rsa_sha1(base_string, rsa_private_key):
     from Crypto.Signature import PKCS1_v1_5
     from Crypto.Hash import SHA
 
-    key = RSA.importKey(private_rsa)
+    key = RSA.importKey(rsa_private_key)
     h = SHA.new(base_string)
     p = PKCS1_v1_5.new(key)
     return binascii.b2a_base64(p.sign(h))[:-1].decode('utf-8')