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package main
import (
"errors"
"strings"
"bytes"
"crypto/rand"
"crypto/sha1"
"encoding/base64"
"fmt"
log "github.com/sirupsen/logrus"
//"github.com/jsimonetti/pwscheme/ssha"
"github.com/jsimonetti/pwscheme/ssha256"
"github.com/jsimonetti/pwscheme/ssha512"
)
const (
SSHA = "{SSHA}"
SSHA256 = "{SSHA256}"
SSHA512 = "{SSHA512}"
)
// Encode encodes the string to ssha512
func SSHAEncode(rawPassPhrase string) (string, error) {
return ssha512.Generate(rawPassPhrase, 16)
}
// Matches matches the encoded password and the raw password
func SSHAMatches(encodedPassPhrase string, rawPassPhrase string) (bool, error) {
hashType, err := determineHashType(encodedPassPhrase)
if err != nil {
return false, errors.New("invalid password hash stored")
}
var is_ok bool
switch hashType {
case SSHA:
is_ok = LegacySSHAMatches(encodedPassPhrase, []byte(rawPassPhrase))
return is_ok, nil
//return ssha.Validate(rawPassPhrase, encodedPassPhrase)
case SSHA256:
return ssha256.Validate(rawPassPhrase, encodedPassPhrase)
case SSHA512:
return ssha512.Validate(rawPassPhrase, encodedPassPhrase)
}
return false, errors.New("no matching hash type found")
}
func determineHashType(hash string) (string, error) {
if len(hash) >= 7 && strings.ToUpper(string(hash[0:6])) == SSHA {
return SSHA, nil
}
if len(hash) >= 10 && strings.ToUpper(string(hash[0:9])) == SSHA256 {
return SSHA256, nil
}
if len(hash) >= 10 && strings.ToUpper(string(hash[0:9])) == SSHA512 {
return SSHA512, nil
}
return "", errors.New("no valid hash found")
}
// --- legacy
// Encode encodes the []byte of raw password
func LegacySSHAEncode(rawPassPhrase []byte) string {
hash := legacyMakeSSHAHash(rawPassPhrase, legacyMakeSalt())
b64 := base64.StdEncoding.EncodeToString(hash)
return fmt.Sprintf("{ssha}%s", b64)
}
// Matches matches the encoded password and the raw password
func LegacySSHAMatches(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 := legacyMakeSSHAHash(rawPassPhrase, salt)
if bytes.Compare(newssha, bhash) != 0 {
return false
}
return true
}
// makeSalt make a 32 byte array containing random bytes.
func legacyMakeSalt() []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 legacyMakeSSHAHash(passphrase, salt []byte) []byte {
sha := sha1.New()
sha.Write(passphrase)
sha.Write(salt)
h := sha.Sum(nil)
return append(h, salt...)
}
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