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password.go
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password.go
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package enscrypt
import (
"bytes"
"crypto/rand"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/base64"
"fmt"
"io"
"strconv"
"strings"
"golang.org/x/crypto/pbkdf2"
)
const (
prfSha1 uint = 0
prfSha256 uint = 1
prfSha512 uint = 2
)
const (
kdfVersion3 byte = 3
)
// HashPassword ...
func HashPassword(password string, v byte, prf uint, count uint) string {
switch v {
case 1:
return hashPasswordV1(password, prf, count)
case 3:
return hashPasswordV3(password, prf, count)
default:
return ""
}
}
// VerifyPassword ..
func VerifyPassword(password string, paaswordHash string) bool {
if strings.Contains(paaswordHash, "$MYHASH$V1") {
return verifyPasswordV1(password, paaswordHash)
}
pwd, err := base64.StdEncoding.DecodeString(paaswordHash)
if err != nil {
return false
}
if pwd[0] == 0x01 {
return verifyPasswordV3(password, pwd)
} else {
return false
}
}
// VerifyPasswordV3 ..
func verifyPasswordV1(password string, passswordHash string) bool {
tempStr := strings.ReplaceAll(passswordHash, "$MYHASH$V1$", "")
splitStr := strings.Split(tempStr, "$")
count, err := strconv.ParseInt(splitStr[0], 10, 64)
if err != nil {
return false
}
hashBytes, err := base64.StdEncoding.DecodeString(splitStr[1])
if err != nil {
return false
}
if len(hashBytes) < 16 {
return false
}
salt := hashBytes[:16]
hashSize := len(hashBytes) - 16
var prf int
switch hashSize {
case 20:
prf = 0
case 32:
prf = 1
case 64:
prf = 2
default:
return false
}
var subkey []byte
if prf == 0 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 20, sha1.New)
} else if prf == 1 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha256.New)
} else {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 64, sha512.New)
}
if bytes.Equal(subkey, hashBytes[16:]) {
return true
} else {
return false
}
}
// VerifyPasswordV3 ..
func verifyPasswordV3(password string, pwd []byte) bool {
prf := ReadNetworkOrder(pwd, 1)
count := ReadNetworkOrder(pwd, 5)
sl := ReadNetworkOrder(pwd, 9)
salt := pwd[13:(13 + sl)]
var subkey []byte
if prf == 0 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha1.New)
} else if prf == 1 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha256.New)
} else {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha512.New)
}
if bytes.Compare(subkey, pwd[(13+sl):]) == 0 {
return true
} else {
return false
}
}
// hashPasswordV1 ..
func hashPasswordV1(password string, prf uint, count uint) string {
salt := make([]byte, 16)
io.ReadFull(rand.Reader, salt[:])
var subkey []byte
if prf == 0 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 20, sha1.New)
} else if prf == 1 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha256.New)
} else {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 64, sha512.New)
}
result := make([]byte, len(salt)+len(subkey))
copy(result[0:], salt)
copy(result[(len(salt)):], subkey)
hashStr := fmt.Sprintf("$MYHASH$V1$%d$%s", count, base64.StdEncoding.EncodeToString(result))
return hashStr
}
// hashPasswordV3 ..
func hashPasswordV3(password string, prf uint, count uint) string {
salt := make([]byte, 16)
io.ReadFull(rand.Reader, salt[:])
var subkey []byte
if prf == 0 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha1.New)
} else if prf == 1 {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha256.New)
} else {
subkey = pbkdf2.Key([]byte(password), salt, int(count), 32, sha512.New)
}
fmt.Println(salt)
result := make([]byte, 13+len(salt)+len(subkey))
result[0] = 0x01
WriteNetworkOrder(result, 1, prf)
WriteNetworkOrder(result, 5, count)
WriteNetworkOrder(result, 9, uint(len(salt)))
copy(result[13:], salt)
copy(result[(13+len(salt)):], subkey)
return base64.StdEncoding.EncodeToString(result)
}
// ReadNetworkOrder ..
func ReadNetworkOrder(data []byte, offset int) uint {
return uint(data[offset])<<24 | uint(data[offset+1])<<16 | uint(data[offset+2])<<8 | uint(data[offset+3])
}
// WriteNetworkOrder ..
func WriteNetworkOrder(data []byte, offset int, value uint) {
data[offset] = byte(value >> 24)
data[offset+1] = byte(value >> 16)
data[offset+2] = byte(value >> 8)
data[offset+3] = byte(value)
}