132 lines
3.2 KiB
Go
132 lines
3.2 KiB
Go
// GoPass
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// Author: Maximilian Patterson
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package main
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import (
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"crypto/rand"
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"fmt"
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"math/big"
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"os"
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"runtime"
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"strconv"
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"strings"
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)
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var allowedCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
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const (
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Version = "1.3.1"
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symbols = "`~!@#$%^&*()_+[]\\{}|;':,./<>?"
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chunkSize = 16 // The size of each chunk of the password to be generated by the worker goroutines
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)
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func matchArguments(args []string) string {
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// If there are no arguments
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if len(args) == 0 {
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return "No password length specified! (ex: gopass 16)"
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}
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// First argument is special, must be an integer, -v, or -h
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var size = 0 // Password length
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switch args[0] {
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case "-v":
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return "GoPass version " + Version
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case "-h":
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return "GoPass - A simple password generator written in Go\n" +
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"Usage: gopass [length] [disallowed characters] [optional remove symbols -s]\n" +
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" Example: gopass 16\n" +
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" Example: gopass 16 -r=abc123!@#\n" +
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" Example: gopass 16 -s\n" +
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"\nFor help (this output): gopass -h\n" +
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"For version: gopass -v\n"
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default:
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err := error(nil)
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size, err = strconv.Atoi(args[0])
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if err != nil {
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return "Invalid first argument (\"" + args[0] + "\") supplied! (Type gopass -h for help)"
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}
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}
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for i := 1; i < len(args); i++ {
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v := args[i]
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switch {
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case v == "-s":
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removeDisallowed([]rune(symbols))
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case strings.HasPrefix(v, "-r="):
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// Remove all characters after the = until next whitespace
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removeDisallowed([]rune(v[2:]))
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default:
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return "Invalid argument (\"" + v + "\") supplied! (Type gopass -h for help)"
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}
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}
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if size <= 0 {
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return "No/invalid password length specified! (ex: gopass 16)"
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} else {
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return generatePassword(size)
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}
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}
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// Remove all disallowed characters from the allowedCharacters slice
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func removeDisallowed(disallowed []rune) {
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disallowedMap := make(map[rune]bool, len(disallowed))
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for _, r := range disallowed {
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disallowedMap[r] = true
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}
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i := 0
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for _, v := range allowedCharacters {
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if !disallowedMap[v] {
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allowedCharacters[i] = v
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i++
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}
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}
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allowedCharacters = allowedCharacters[:i]
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}
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func generatePassword(size int) string {
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// Make empty array of runes with size of size
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pass := make([]rune, size)
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// Create a channel to receive chunks of the password
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passChan := make(chan []rune)
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// Determine the number of worker goroutines to use
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numWorkers := runtime.NumCPU()
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// Launch the worker goroutines
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for i := 0; i < numWorkers; i++ {
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go func() {
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allowedLen := len(allowedCharacters)
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for {
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// Generate a chunk of the password
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chunk := make([]rune, chunkSize)
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for i := range chunk {
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index, err := rand.Int(rand.Reader, big.NewInt(int64(allowedLen)))
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if err != nil {
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println("Error securely generating random character chunk!")
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return
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}
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chunk[i] = allowedCharacters[index.Int64()]
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}
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// Send the chunk of the password to the main goroutine
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passChan <- chunk
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}
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}()
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}
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// Collect the chunks of the password from the channel
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for i := 0; i < size; i += chunkSize {
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chunk := <-passChan
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copy(pass[i:], chunk)
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}
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return string(pass)
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}
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func main() {
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// Process arguments
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fmt.Println(matchArguments(os.Args[1:]))
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}
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