Add shared code for entropy tests
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@magnumripper is already working on this.
Since Oct 26, 2018.
enhancement
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Description
See https://github.com/hashcat/hashcat/issues/1729#issuecomment-433291076
As mentioned in that comment, a cold (really proper test) version could be used for detecting bogus input data. It could be used to verify quality of any input data blobs that are supposedly encrypted and/or compressed. At some threshold we could warn and at obvious cases (like that hashcat OP) it's a no-brainer and the input data can be rejected with a notice.
We might also want a shared hot (as fast as possible) one for post-crypt evaluation (for formats where correct data should have low entropy, ie. not compressed).
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