hash

var HashCmd = &cobra.Command{
	Use:   fmt.Sprintf("hash [%s]", strings.Join(supportedHashFunctions, "|")),
	Short: "Simple command line tools for common crypto hashing functions",
	Long: `Hash Functions

This is a simple command line tool to run common hash functions. If
the --file argument is provided, we'll attempt to read the file and
hash it. If additionall data is provided on the command line, that
will be hashed. Otherwise, we'll attempted to read the standard input.
`,
	Run: func(cmd *cobra.Command, args []string) {
		data, err := getInputData(cmd, args)
		if err != nil {
			cmd.PrintErrf("There was a nerror 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, ","))
	},
}