(A part of) a MurmurHash3 murmur128 Go implementation whose result is compatible with C++ (original) and Python versions

murmur128_sumle.go

// This gist is distributed under {public domain, CC0, <some OSI-approved license> Copyright (c) 2023 Hajime Senuma}.
// Choose what you want to use.

// See
// https://github.com/hajimes/mmh3/issues/46
// https://stackoverflow.com/questions/75921577/murmur3-hash-compatibility-between-go-and-python

package main
import "fmt"

// Returns the C MurmurHash3_x64_128-compliant byte sequence (on little-endian machines)
// of the result of murmur3.Sum128 or murmur3.Sum128WithSeed
func SumLittleEndian(h1, h2 uint64) []byte {
	var b []byte

	return append(b,
		byte(h1), byte(h1>>8), byte(h1>>16), byte(h1>>24), byte(h1>>32),
		byte(h1>>40), byte(h1>>48), byte(h1>>56),

		byte(h2), byte(h2>>8), byte(h2>>16), byte(h2>>24), byte(h2>>32),
		byte(h2>>40), byte(h2>>48), byte(h2>>56),
	)
}

func main() {
	var byteArray []byte = SumLittleEndian(0x70b1d2a369c2071c, 0x8e7b3be22cce60c2)
	fmt.Println(base64.RawURLEncoding.EncodeToString(byteArray))

	// The above prints out HAfCaaPSsXDCYM4s4jt7jg
}