testKeys.go

package main

import(
  "fmt"
	"encoding/hex"
  "golang.org/x/crypto/curve25519"
)

func main(){
	// decode given private key
	privkey, _ := hex.DecodeString("803fcdab44e9958d2f8e4d47b5f0d481d6ddb79dd462a18ee65cabe94a9e455c")
	var privkeyArray [32]byte
	copy(privkeyArray[:], privkey)
	// decode expected public key
	expectedPubKey, _ := hex.DecodeString("26100e941bdd2103038d8dec9a1884694736f591ee814e66ae6e2e2284757136")
	// create public key out of given private key
	var pubkey [32]byte
	curve25519.ScalarBaseMult(&pubkey, &privkeyArray)
	// print
  fmt.Println("calculated public key:", hex.EncodeToString(pubkey[:]))
	fmt.Println("     given public key:", hex.EncodeToString(expectedPubKey))
}