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refactor: add comments and format code style

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This commit is contained in:
ᴍᴏᴏɴD4ʀᴋ
2022-08-14 01:18:28 +08:00
parent 77991605b2
commit 147d57e8f4
4 changed files with 100 additions and 75 deletions
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internal/decrypter/decrypter.go
+61 -43
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@@ -44,13 +44,13 @@ func NewASN1PBE(b []byte) (pbe ASN1PBE, err error) {
}
// nssPBE Struct
// SEQUENCE (2 elem)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// SEQUENCE (2 elem)
// OCTET STRING (20 byte)
// INTEGER 1
// OCTET STRING (16 byte)
//
// 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
@@ -62,10 +62,6 @@ type nssPBE struct {
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)
@@ -82,26 +78,34 @@ func (n nssPBE) Decrypt(globalSalt, masterPwd []byte) (key []byte, err error) {
k2.Write(tkPlus)
k := append(k1.Sum(nil), k2.Sum(nil)...)
iv := k[len(k)-8:]
return des3Decrypt(k[:24], iv, n.Encrypted)
return des3Decrypt(k[:24], iv, n.encrypted())
}
func (n nssPBE) entrySalt() []byte {
return n.AlgoAttr.SaltAttr.EntrySalt
}
func (n nssPBE) encrypted() []byte {
return 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)
//
// 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
@@ -135,8 +139,8 @@ type slatAttr struct {
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)
iv := append([]byte{4, 14}, m.iv()...)
return aes128CBCDecrypt(key, iv, m.encrypted())
}
func (m metaPBE) entrySalt() []byte {
@@ -151,13 +155,21 @@ func (m metaPBE) keySize() int {
return m.AlgoAttr.Data.Data.SlatAttr.KeySize
}
func (m metaPBE) iv() []byte {
return m.AlgoAttr.Data.IVData.IV
}
func (m metaPBE) encrypted() []byte {
return m.Encrypted
}
// loginPBE Struct
// SEQUENCE (3 elem)
// OCTET STRING (16 byte)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// OCTET STRING (8 byte)
// OCTET STRING (16 byte)
//
// OCTET STRING (16 byte)
// SEQUENCE (2 elem)
// OBJECT IDENTIFIER
// OCTET STRING (8 byte)
// OCTET STRING (16 byte)
type loginPBE struct {
CipherText []byte
Data struct {
@@ -168,7 +180,14 @@ type loginPBE struct {
}
func (l loginPBE) Decrypt(globalSalt, masterPwd []byte) (key []byte, err error) {
return des3Decrypt(globalSalt, l.Data.IV, l.Encrypted)
return des3Decrypt(globalSalt, l.iv(), l.encrypted())
}
func (l loginPBE) iv() []byte {
return l.Data.IV
}
func (l loginPBE) encrypted() []byte {
return l.Encrypted
}
func aes128CBCDecrypt(key, iv, encryptPass []byte) ([]byte, error) {
@@ -197,7 +216,7 @@ func pkcs5UnPadding(src []byte, blockSize int) []byte {
return src[:n-paddingNum]
}
// des3Decrypt use for decrypter firefox PBE
// des3Decrypt use for decrypt firefox PBE
func des3Decrypt(key, iv []byte, src []byte) ([]byte, error) {
block, err := des.NewTripleDESCipher(key)
if err != nil {
@@ -213,10 +232,9 @@ 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
}
for i := len(s); i < l; i++ {
s = append(s, 0)
}
return s
}