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Fixed invalid check for None
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@ -33,7 +33,7 @@ def hkdf(length=None, derive_from=None, salt=None, context=None):
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if length == None or length < 1:
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raise ValueError("Invalid output key length")
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if derive_from == "None" or derive_from == "":
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if derive_from == None or derive_from == "":
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raise ValueError("Cannot derive key from empty input material")
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if salt == None or len(salt) == 0:
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@ -54,4 +54,4 @@ def hkdf(length=None, derive_from=None, salt=None, context=None):
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block = hmac_sha256(pseudorandom_key, block + context + bytes([i + 1]))
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derived += block
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return derived[:length]
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return derived[:length]
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