75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// GoPass
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// Author: Maximilian Patterson
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// Version: 1.2.2
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package main
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import (
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cryptorand "crypto/rand"
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"encoding/binary"
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"fmt"
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"math/big"
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mathrand "math/rand"
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"os"
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"strconv"
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)
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var allowedCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
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func main() {
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// Take in all OS arg
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args := os.Args[1:]
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if len(args) < 1 {
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println("No password length specified! (ex: ./gopass 16)")
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return
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}
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// Convert String arg to int
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size, err := strconv.Atoi(args[0])
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if err != nil {
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println("First argument supplied must be an integer! (ex: 16)")
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return
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}
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// Grab second argument (if it exists) and use it as a disallowed character(s)
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var disallowed []rune
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if len(args) == 2 {
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// Break apart the string into a slice of runes
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disallowed = []rune(args[1])
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// Remove all disallowed characters from the allowedCharacters slice
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for _, r := range disallowed {
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for i, v := range allowedCharacters {
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if v == r {
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allowedCharacters = append(allowedCharacters[:i], allowedCharacters[i+1:]...)
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}
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}
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}
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}
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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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// Seed rand with time
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var b [8]byte
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_, err = cryptorand.Read(b[:])
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if err != nil {
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println("Error securely seeding crypto/rand!")
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return
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}
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mathrand.Seed(int64(binary.LittleEndian.Uint64(b[:])))
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// Assign every slot of pass to a random allowedCharacter
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for i := range pass {
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// Generate a random int greater than 0 and not to exceed the length of allowedCharacters
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index, err := cryptorand.Int(cryptorand.Reader, big.NewInt(int64(len(allowedCharacters))))
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if err != nil {
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println("Error securely generating random character!")
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return
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}
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pass[i] = allowedCharacters[index.Int64()]
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}
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// Print the password
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fmt.Println(string(pass))
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}
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