code: func IsSha256Valid(s string) bool {
  	if len(s) != 64 {
  		return false
  	}
  	b, err := hex.DecodeString(s)
  	if err != nil {
  		return false
  	}
  	if len(b) != 32 {
  		return false
  	}
  	return true
  }
docs: // Simple function that allows verification that a string is in fact a valid
  // SHA256 formated string.