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This generate a dovecot password in golang, inspired by https://gist.github.com/garrettreid/8329796
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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))) | |
} |
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