GoPass/main.go

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// GoPass
// Author: Maximilian Patterson
// Version: 1.2.0
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package main
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import (
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cryptorand "crypto/rand"
"encoding/binary"
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"fmt"
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mathrand "math/rand"
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"os"
"strconv"
)
var allowedCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
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func main() {
// Take in all OS arg
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args := os.Args[1:]
if len(args) < 1 {
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panic("No password length specified! (ex: ./gopass 16)")
}
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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 {
panic("First argument supplied must be an integer! (ex: 16)")
}
// Grab second argument (if it exists) and use it as a disallowed character(s)
var disallowed []rune
if len(args) == 2 {
// Break apart the string into a slice of runes
disallowed = []rune(args[1])
// Remove all disallowed characters from the allowedCharacters slice
for _, r := range disallowed {
for i, v := range allowedCharacters {
if v == r {
allowedCharacters = append(allowedCharacters[:i], allowedCharacters[i+1:]...)
}
}
}
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}
// Make empty array of runes with size of size
pass := make([]rune, size)
// Seed rand with time
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var b [8]byte
_, err = cryptorand.Read(b[:])
if err != nil {
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panic("Error securely seeding crypto/rand!")
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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 {
// Generate a random int greater than 0 and not to exceed the length of allowedCharacters
pass[i] = allowedCharacters[mathrand.Intn(len(allowedCharacters))]
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}
// Print the password
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fmt.Println(string(pass))
}