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hkdf: Remove duplicate check if the salt is None
The second if isn't needed since we initialize the salt with zeroes earlier. If instead we meant to pass an empty bytes class to the HMAC implementation, the end result would be the same, since it's gonna get padded with zeroes in the HMAC code.
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@ -39,9 +39,6 @@ def hkdf(length=None, derive_from=None, salt=None, context=None):
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if salt == None or len(salt) == 0:
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salt = bytes([0] * hash_len)
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if salt == None:
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salt = b""
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if context == None:
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context = b""
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