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decrypter.go
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decrypter.go
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package decrypter
import (
"crypto/aes"
"crypto/cipher"
"crypto/des"
"crypto/hmac"
"crypto/sha1"
"crypto/sha256"
"encoding/asn1"
"errors"
"golang.org/x/crypto/pbkdf2"
)
var (
errSecurityKeyIsEmpty = errors.New("input [security find-generic-password -wa 'Chrome'] in terminal")
errPasswordIsEmpty = errors.New("password is empty")
errDecryptFailed = errors.New("decrypt encrypted value failed")
errDecodeASN1Failed = errors.New("decode ASN1 data failed")
errEncryptedLength = errors.New("length of encrypted password less than block size")
)
type ASN1PBE interface {
Decrypt(globalSalt, masterPwd []byte) (key []byte, err error)
}
func NewASN1PBE(b []byte) (pbe ASN1PBE, err error) {
var (
n nssPBE
m metaPBE
l loginPBE
)
if _, err := asn1.Unmarshal(b, &n); err == nil {
return n, nil
}
if _, err := asn1.Unmarshal(b, &m); err == nil {
return m, nil
}
if _, err := asn1.Unmarshal(b, &l); err == nil {
return l, nil
}
return nil, errDecodeASN1Failed
}
// nssPBE Struct
// SEQUENCE (2 elem)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// SEQUENCE (2 elem)
// OCTET STRING (20 byte)
// INTEGER 1
// OCTET STRING (16 byte)
type nssPBE struct {
AlgoAttr struct {
asn1.ObjectIdentifier
SaltAttr struct {
EntrySalt []byte
Len int
}
}
Encrypted []byte
}
func (n nssPBE) entrySalt() []byte {
return n.AlgoAttr.SaltAttr.EntrySalt
}
func (n nssPBE) Decrypt(globalSalt, masterPwd []byte) (key []byte, err error) {
glmp := append(globalSalt, masterPwd...)
hp := sha1.Sum(glmp)
s := append(hp[:], n.entrySalt()...)
chp := sha1.Sum(s)
pes := paddingZero(n.entrySalt(), 20)
tk := hmac.New(sha1.New, chp[:])
tk.Write(pes)
pes = append(pes, n.entrySalt()...)
k1 := hmac.New(sha1.New, chp[:])
k1.Write(pes)
tkPlus := append(tk.Sum(nil), n.entrySalt()...)
k2 := hmac.New(sha1.New, chp[:])
k2.Write(tkPlus)
k := append(k1.Sum(nil), k2.Sum(nil)...)
iv := k[len(k)-8:]
return des3Decrypt(k[:24], iv, n.Encrypted)
}
// MetaPBE Struct
// SEQUENCE (2 elem)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// SEQUENCE (2 elem)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// SEQUENCE (4 elem)
// OCTET STRING (32 byte)
// INTEGER 1
// INTEGER 32
// SEQUENCE (1 elem)
// OBJECT IDENTIFIER
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// OCTET STRING (14 byte)
// OCTET STRING (16 byte)
type metaPBE struct {
AlgoAttr algoAttr
Encrypted []byte
}
type algoAttr struct {
asn1.ObjectIdentifier
Data struct {
Data struct {
asn1.ObjectIdentifier
SlatAttr slatAttr
}
IVData ivAttr
}
}
type ivAttr struct {
asn1.ObjectIdentifier
IV []byte
}
type slatAttr struct {
EntrySalt []byte
IterationCount int
KeySize int
Algorithm struct {
asn1.ObjectIdentifier
}
}
func (m metaPBE) Decrypt(globalSalt, masterPwd []byte) (key2 []byte, err error) {
k := sha1.Sum(globalSalt)
key := pbkdf2.Key(k[:], m.entrySalt(), m.iterationCount(), m.keySize(), sha256.New)
iv := append([]byte{4, 14}, m.AlgoAttr.Data.IVData.IV...)
return aes128CBCDecrypt(key, iv, m.Encrypted)
}
func (m metaPBE) entrySalt() []byte {
return m.AlgoAttr.Data.Data.SlatAttr.EntrySalt
}
func (m metaPBE) iterationCount() int {
return m.AlgoAttr.Data.Data.SlatAttr.IterationCount
}
func (m metaPBE) keySize() int {
return m.AlgoAttr.Data.Data.SlatAttr.KeySize
}
// loginPBE Struct
// SEQUENCE (3 elem)
// OCTET STRING (16 byte)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// OCTET STRING (8 byte)
// OCTET STRING (16 byte)
type loginPBE struct {
CipherText []byte
Data struct {
asn1.ObjectIdentifier
IV []byte
}
Encrypted []byte
}
func (l loginPBE) Decrypt(globalSalt, masterPwd []byte) (key []byte, err error) {
return des3Decrypt(globalSalt, l.Data.IV, l.Encrypted)
}
func aes128CBCDecrypt(key, iv, encryptPass []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
encryptLen := len(encryptPass)
if encryptLen < block.BlockSize() {
return nil, errEncryptedLength
}
dst := make([]byte, encryptLen)
mode := cipher.NewCBCDecrypter(block, iv)
mode.CryptBlocks(dst, encryptPass)
dst = pkcs5UnPadding(dst, block.BlockSize())
return dst, nil
}
func pkcs5UnPadding(src []byte, blockSize int) []byte {
n := len(src)
paddingNum := int(src[n-1])
if n < paddingNum || paddingNum > blockSize {
return src
}
return src[:n-paddingNum]
}
// des3Decrypt use for decrypter firefox PBE
func des3Decrypt(key, iv []byte, src []byte) ([]byte, error) {
block, err := des.NewTripleDESCipher(key)
if err != nil {
return nil, err
}
blockMode := cipher.NewCBCDecrypter(block, iv)
sq := make([]byte, len(src))
blockMode.CryptBlocks(sq, src)
return pkcs5UnPadding(sq, block.BlockSize()), nil
}
func paddingZero(s []byte, l int) []byte {
h := l - len(s)
if h <= 0 {
return s
} else {
for i := len(s); i < l; i++ {
s = append(s, 0)
}
return s
}
}