package main import ( "bytes" "crypto/rand" "crypto/sha1" "encoding/base64" "fmt" "strings" log "github.com/sirupsen/logrus" ) // Encode encodes the []byte of raw password func SSHAEncode(rawPassPhrase []byte) string { hash := makeSSHAHash(rawPassPhrase, makeSalt()) b64 := base64.StdEncoding.EncodeToString(hash) return fmt.Sprintf("{ssha}%s", b64) } // Matches matches the encoded password and the raw password func SSHAMatches(encodedPassPhrase string, rawPassPhrase []byte) bool { if !strings.EqualFold(encodedPassPhrase[:6], "{ssha}") { return false } bhash, err := base64.StdEncoding.DecodeString(encodedPassPhrase[6:]) if err != nil { return false } salt := bhash[20:] newssha := makeSSHAHash(rawPassPhrase, salt) if bytes.Compare(newssha, bhash) != 0 { return false } return true } // makeSalt make a 32 byte array containing random bytes. func makeSalt() []byte { sbytes := make([]byte, 32) _, err := rand.Read(sbytes) if err != nil { log.Panicf("Could not read random bytes: %s", err) } return sbytes } // makeSSHAHash make hasing using SHA-1 with salt. This is not the final output though. You need to append {SSHA} string with base64 of this hash. func makeSSHAHash(passphrase, salt []byte) []byte { sha := sha1.New() sha.Write(passphrase) sha.Write(salt) h := sha.Sum(nil) return append(h, salt...) }