hash

var HashCmd = &cobra.Command{
	Use:   fmt.Sprintf("hash [%s]", strings.Join(supportedHashFunctions, "|")),
	Short: "Provide common crypto hashing functions.",
	Long:  usage,
	Run: func(cmd *cobra.Command, args []string) {
		data, err := getInputData(cmd, args)
		if err != nil {
			cmd.PrintErrf("There was an error reading input for hashing: %s", err.Error())
			return
		}
		h, err := getHash(args[0])
		if err != nil {
			cmd.PrintErrf("There was an error creating the hash function: %s", err.Error())
			return
		}
		h.Write(data)
		hashOut := h.Sum(nil)
		cmd.Println(hex.EncodeToString(hashOut))

	},
	Args: func(cmd *cobra.Command, args []string) error {
		if len(args) < 1 {
			return fmt.Errorf("expected 1 argument to specify hash function. got %d", len(args))
		}
		for _, v := range supportedHashFunctions {
			if v == args[0] {
				return nil
			}
		}

		return fmt.Errorf("the name %s is not recognized. Please use one of the following: %s", args[0], strings.Join(supportedHashFunctions, ","))
	},
}