diff options
Diffstat (limited to 'Lib/hmac.py')
| -rw-r--r-- | Lib/hmac.py | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/Lib/hmac.py b/Lib/hmac.py index 0f59fd4847..e878e1a809 100644 --- a/Lib/hmac.py +++ b/Lib/hmac.py @@ -12,10 +12,6 @@ trans_36 = bytes((x ^ 0x36) for x in range(256)) # hashing module used. Use digest_size from the instance of HMAC instead. digest_size = None -# A unique object passed by HMAC.copy() to the HMAC constructor, in order -# that the latter return very quickly. HMAC("") in contrast is quite -# expensive. -_secret_backdoor_key = [] class HMAC: """RFC 2104 HMAC class. Also complies with RFC 4231. @@ -36,9 +32,6 @@ class HMAC: Note: key and msg must be bytes objects. """ - if key is _secret_backdoor_key: # cheap - return - if not isinstance(key, bytes): raise TypeError("expected bytes, but got %r" % type(key).__name__) @@ -58,8 +51,6 @@ class HMAC: if hasattr(self.inner, 'block_size'): blocksize = self.inner.block_size if blocksize < 16: - # Very low blocksize, most likely a legacy value like - # Lib/sha.py and Lib/md5.py have. _warnings.warn('block_size of %d seems too small; using our ' 'default of %d.' % (blocksize, self.blocksize), RuntimeWarning, 2) @@ -79,9 +70,6 @@ class HMAC: if msg is not None: self.update(msg) -## def clear(self): -## raise NotImplementedError, "clear() method not available in HMAC." - def update(self, msg): """Update this hashing object with the string msg. """ @@ -94,7 +82,8 @@ class HMAC: An update to this copy won't affect the original object. """ - other = self.__class__(_secret_backdoor_key) + # Call __new__ directly to avoid the expensive __init__. + other = self.__class__.__new__(self.__class__) other.digest_cons = self.digest_cons other.digest_size = self.digest_size other.inner = self.inner.copy() |