- abstracted symmetric decryption so the actual cipher object construction and ciphertext decryption happens in one place to make the code easier to maintain

- moved asymmetric decryption into PKESessionKey as it makes more sense to have it in the one place where asymmetric decryption is even used

pgpy/errors.py

@@ -7,7 +7,7 @@ class PGPError(Exception):
     pass
 
 
-class PGPKeyDecryptionError(Exception):
+class PGPDecryptionError(Exception):
     """Raised when decryption fails"""
     pass