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How Go's crypto Package Uses AES-NI and SHA-NI

Oct 21, 2026 17 min read Jay Hubbert

crypto/aes and crypto/sha256 are now thin shims over crypto/internal/fips140, where CPUID feature bits pick between AES-NI, SHA-NI, AVX2 and generic Go implementations at build and …

GoInternalsCryptoAssemblyPerformance

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