subtle.XORBytes(buf, src, buf) copy(dst, buf) } func add128(lo, hi uint64, x uint64) (uint64, uint64) { lo, c := bits.Add64(lo, x, 0) hi, _ = bits.Add64(hi, 0, c) return lo, hi } golang.org/fips140@v1.0.0/fips140/v1.0.0/aes/ctr_amd64.s // Code generated by command: go run ctr_amd64_asm.go -out ../../ctr_amd64.s. DO NOT EDIT. //go:build !purego #include "textflag.h" // func ctrBlocks1Asm(nr int, xk *[60]uint32, dst *[16]byte, src *[16]byte, ivlo uint64, ivhi uint64) // Requires: AES, SSE, SSE2, SSE4.1, SSSE3 TEXT...