Raise on default IV#57
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This disables the static default IV for CBC, CFB and OFB by raising when not IV gets passed. We make sure not to break the API contract this way, so that existing consumers who rely on the default IV get a useful exception message instead of an API break, which could be done in a future version. In CBC mode an IV cannot be predictable or it breaks IND-CPA, this is also described as CWE-329. In CFB and OFB mode an IV still requires to be unique, which does not really hold when initializing it statically.
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This disables the static default IV for CBC, CFB and OFB by raising when not IV gets passed. We make sure not to break the API contract this way, so that existing consumers who rely on the default IV get a useful exception message instead of an API break, which could be done in a future version.
In CBC mode an IV cannot be predictable or it breaks IND-CPA, this is also described as CWE-329.
In CFB and OFB mode an IV still requires to be unique, which does not really hold when initializing it statically.
Fixes: #56