mirror of
https://github.com/rclone/rclone.git
synced 2024-11-30 04:15:26 +01:00
193c30d570
- factor password generation into lib/random.Password - call from appropriate places - choose appropriate use of random.String vs random.Password
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
// Package random holds a few functions for working with random numbers
|
|
package random
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"math/rand"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
// String create a random string for test purposes.
|
|
//
|
|
// Do not use these for passwords.
|
|
func String(n int) string {
|
|
const (
|
|
vowel = "aeiou"
|
|
consonant = "bcdfghjklmnpqrstvwxyz"
|
|
digit = "0123456789"
|
|
)
|
|
pattern := []string{consonant, vowel, consonant, vowel, consonant, vowel, consonant, digit}
|
|
out := make([]byte, n)
|
|
p := 0
|
|
for i := range out {
|
|
source := pattern[p]
|
|
p = (p + 1) % len(pattern)
|
|
out[i] = source[rand.Intn(len(source))]
|
|
}
|
|
return string(out)
|
|
}
|
|
|
|
// Password creates a crypto strong password which is just about
|
|
// memorable. The password is composed of printable ASCII characters
|
|
// from the base64 alphabet.
|
|
//
|
|
// Requres password strength in bits.
|
|
// 64 is just about memorable
|
|
// 128 is secure
|
|
func Password(bits int) (password string, err error) {
|
|
bytes := bits / 8
|
|
if bits%8 != 0 {
|
|
bytes++
|
|
}
|
|
var pw = make([]byte, bytes)
|
|
n, err := rand.Read(pw)
|
|
if err != nil {
|
|
return "", errors.Wrap(err, "password read failed")
|
|
}
|
|
if n != bytes {
|
|
return "", errors.Errorf("password short read: %d", n)
|
|
}
|
|
password = base64.RawURLEncoding.EncodeToString(pw)
|
|
return password, nil
|
|
}
|