[issue32569] Blake2 module, memory clearance update

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Thanks for your contribution. Any optimization must land in upstream first, https://github.com/BLAKE2/libb2.

See https://bugs.python.org/issue17405 for more discussion on the topic.

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nosy: +christian.heimes

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