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AES-GCM No Hardware Acceleration Like AES-NI Enabled throw exception for ChaCha20Poly1305 #47

@WingZer0o

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@WingZer0o

I am confirming some details from the RustCrypto authors if constant time implementation of AES-GCM compensates for an added risk of cache collision timing attacks. I am not quite sure.

https://en.wikipedia.org/wiki/AES_instruction_set
https://www.iacr.org/archive/ches2006/16/16.pdf

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