style: format code and update readme

utils/utils.go

@@ -1,6 +1,9 @@
 package utils
 
 import (
+	"crypto/cipher"
+	"crypto/des"
+	"encoding/asn1"
 	"errors"
 	"fmt"
 	"hack-browser-data/log"
@@ -84,11 +87,11 @@ func CopyDB(src, dst string) error {
 	}
 	sourceFile, err := ioutil.ReadFile(src)
 	if err != nil {
-		log.Println(err.Error())
+		log.Debug(err.Error())
 	}
 	err = ioutil.WriteFile(dst, sourceFile, 0777)
 	if err != nil {
-		log.Println(err.Error())
+		log.Debug(err.Error())
 	}
 	return err
 }
@@ -164,7 +167,7 @@ func MakeDir(dirName string) {
 	}
 }
 
-func paddingZero(s []byte, l int) []byte {
+func PaddingZero(s []byte, l int) []byte {
 	h := l - len(s)
 	if h <= 0 {
 		return s
@@ -180,4 +183,44 @@ func PKCS5UnPadding(src []byte) []byte {
 	length := len(src)
 	unpadding := int(src[length-1])
 	return src[:(length - unpadding)]
-}
+}
+
+func Des3Decrypt(key, iv []byte, src []byte) ([]byte, error) {
+	block, err := des.NewTripleDESCipher(key)
+	if err != nil {
+		log.Error(err)
+		return nil, err
+	}
+	blockMode := cipher.NewCBCDecrypter(block, iv)
+	sq := make([]byte, len(src))
+	blockMode.CryptBlocks(sq, src)
+	return sq, nil
+}
+
+/*
+SEQUENCE (3 elem)
+	OCTET STRING (16 byte)
+	SEQUENCE (2 elem)
+		OBJECT IDENTIFIER 1.2.840.113549.3.7 des-EDE3-CBC (RSADSI encryptionAlgorithm)
+		OCTET STRING (8 byte)
+	OCTET STRING (16 byte)
+*/
+type LoginPBE struct {
+	CipherText []byte
+	SequenceLogin
+	Encrypted []byte
+}
+
+type SequenceLogin struct {
+	asn1.ObjectIdentifier
+	Iv []byte
+}
+
+func DecodeLogin(decodeItem []byte) (pbe LoginPBE, err error) {
+	_, err = asn1.Unmarshal(decodeItem, &pbe)
+	if err != nil {
+		log.Error(err)
+		return
+	}
+	return pbe, nil
+}