Switched hash functions from PyCrypto to hashlib.

There's a few advantages to this:

1) It's probably fast, OpenSSL, which typically backs hashlib, receives far
   more attention for optimizaitons than PyCrypto.
2) It's the first step to supporting PyPy, where PyCrypto doesn't run.

1 files changed, 4 insertions, 5 deletions

diff --git a/paramiko/util.py b/paramiko/util.py
index dbcbbae4..f4ee3adc 100644
--- a/paramiko/util.py
+++ b/paramiko/util.py
@@ -143,15 +143,14 @@ def tb_strings():
     return ''.join(traceback.format_exception(*sys.exc_info())).split('\n')
 
 
-def generate_key_bytes(hashclass, salt, key, nbytes):
+def generate_key_bytes(hash_alg, salt, key, nbytes):
     """
     Given a password, passphrase, or other human-source key, scramble it
     through a secure hash into some keyworthy bytes.  This specific algorithm
     is used for encrypting/decrypting private key files.
 
-    :param class hashclass:
-        class from `Crypto.Hash` that can be used as a secure hashing function
-        (like ``MD5`` or ``SHA``).
+    :param function hash_alg: A function which creates a new hash object, such
+        as ``hashlib.sha256``.
     :param salt: data to salt the hash with.
     :type salt: byte string
     :param str key: human-entered password or passphrase.
@@ -163,7 +162,7 @@ def generate_key_bytes(hashclass, salt, key, nbytes):
     if len(salt) > 8:
         salt = salt[:8]
     while nbytes > 0:
-        hash_obj = hashclass.new()
+        hash_obj = hash_alg()
         if len(digest) > 0:
             hash_obj.update(digest)
         hash_obj.update(b(key))