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proposal: crypto/internal/fips140/aes: asm implementation of AES-XTS #74758

@jclab-joseph

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@jclab-joseph

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Currently, AES CTR has an asm implementation for multi-blocks, which allows fast operation, but AES-XTS is processed as a single block, which does not perform well.

So I propose a multi-block XTS implementation.

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    LibraryProposalIssues describing a requested change to the Go standard library or x/ libraries, but not to a toolProposalProposal-CryptoProposal related to crypto packages or other security issues

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