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chacha20: Allow reinitialisation of existing chacha20 structure #178

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chacha20: Allow reinitialisation of existing chacha20 structure #178

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Commits on Feb 20, 2021

  1. chacha20: Allow reinitialisation of existing chacha20 structure 

    Rather than requiring a new memory allocation for every use of the
chacha20 primitive allow an existing chacha20.Cipher to be reinitialised
with a new key + nonce. This can help avoid allocations in hot paths.

Fixes golang/go#44449
    @u1f35c
    u1f35c committed Feb 20, 2021
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