ethereumChecksum.go

package checksum

import (
  "encoding/hex"
  "golang.org/x/crypto/sha3"
  "strconv"
  "strings"
)

func checksum(address string) string {
  address = strings.ToLower(address)
  address = strings.Replace(address, "0x", "", 1)
  sha := sha3.NewLegacyKeccak256()
  sha.Write([]byte(address))
  hash := sha.Sum(nil)
  hashstr := hex.EncodeToString(hash)
  result := []string{"0x"}
  for i, v := range address {
    res, _ := strconv.ParseInt(string(hashstr[i]), 16, 64)
    if res > 7 {
      result = append(result, strings.ToUpper(string(v)))
      continue
    }
    result = append(result, string(v))
  }
  return strings.Join(result, "")
}
func isChecksum(address string) bool {
  return checksum(address) == address
}