Skip to content

Instantly share code, notes, and snippets.

@osiloke osiloke/doveadmpw.go
Last active Sep 4, 2017

Embed
What would you like to do?
This generate a dovecot password in golang, inspired by https://gist.github.com/garrettreid/8329796
package main
import (
"crypto/sha512"
"encoding/base64"
"fmt"
"math/rand"
"time"
)
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
var src = rand.NewSource(time.Now().UnixNano())
//http://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang
func RandStringBytesMaskImprSrc(n int) string {
b := make([]byte, n)
// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return string(b)
}
func main() {
salt := RandStringBytesMaskImprSrc(5)
password := "randompass"
hasher := sha512.New()
hasher.Write([]byte(password))
hasher.Write([]byte(salt))
fmt.Printf("{SSHA512}%s\n", base64.StdEncoding.EncodeToString([]byte(string(hasher.Sum(nil))+salt)))
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.