refactor code Closes #13

core/decrypt/decrypt.go

@@ -0,0 +1,85 @@
+package decrypt
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/des"
+	"encoding/asn1"
+	"errors"
+	"hack-browser-data/log"
+)
+
+var (
+	errKeyIsEmpty      = errors.New("input [security find-generic-password -wa 'Chrome'] in terminal")
+	errPasswordIsEmpty = errors.New("password is empty")
+	errDecryptFailed   = errors.New("decrypt failed, password is empty")
+)
+
+func aes128CBCDecrypt(key, iv, encryptPass []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return []byte{}, err
+	}
+	dst := make([]byte, len(encryptPass))
+	mode := cipher.NewCBCDecrypter(block, iv)
+	mode.CryptBlocks(dst, encryptPass)
+	dst = PKCS5UnPadding(dst)
+	return dst, nil
+}
+
+func PKCS5UnPadding(src []byte) []byte {
+	length := len(src)
+	unpad := int(src[length-1])
+	return src[:(length - unpad)]
+}
+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
+}
+
+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
+	}
+}
+
+/*
+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
+}