From b6e53aea9e988949a35ec13617561030b61d24fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=82=B9=E5=AE=97=E6=A5=A0?= <zouzongnan1995@icloud.com>
Date: Fri, 10 Jun 2022 18:02:40 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=8A=96=E9=9F=B3=E7=94=A8?=
 =?UTF-8?q?=E6=88=B7=E4=BF=A1=E6=81=AF=E8=A7=A3=E5=AF=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 utils/utils_crypt.go      | 14 ++++++++++++++
 utils/utils_crypt_test.go | 30 ++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/utils/utils_crypt.go b/utils/utils_crypt.go
index 084eb680..c2da0500 100644
--- a/utils/utils_crypt.go
+++ b/utils/utils_crypt.go
@@ -45,3 +45,17 @@ func PKCSPadding(ciphertext []byte, blockSize int) []byte {
 	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
 	return append(ciphertext, padtext...)
 }
+
+// AESCBC16Decrypt 抖音十六位解密
+func AESCBC16Decrypt(key, iv, src []byte) ([]byte, error) {
+	decrypted := make([]byte, len(src))
+	var aesBlockDecrypt cipher.Block
+	aesBlockDecrypt, err := aes.NewCipher(key)
+	if err != nil {
+		println(err.Error())
+		return nil, err
+	}
+	aesDecrypt := cipher.NewCBCDecrypter(aesBlockDecrypt, iv)
+	aesDecrypt.CryptBlocks(decrypted, src)
+	return decrypted[:len(decrypted)-int(decrypted[len(decrypted)-1])], err
+}
diff --git a/utils/utils_crypt_test.go b/utils/utils_crypt_test.go
index abe0ac62..b9d15921 100644
--- a/utils/utils_crypt_test.go
+++ b/utils/utils_crypt_test.go
@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"encoding/base64"
 	"testing"
 )
 
@@ -19,3 +20,32 @@ func TestCrypt(t *testing.T) {
 		t.Fatal("result is wrong")
 	}
 }
+
+func TestCrypt2(t *testing.T) {
+	//aesKey := []byte("123456789012345678901234567890ab")
+	//msg := "hellasfsafsdsads"
+	//encryptedMsg, err := AESCBCEncpryt([]byte(msg), aesKey, aesKey[:16])
+	//if err != nil {
+	//	t.Fatal(err)
+	//}
+	encryptedMsg := "f6T3xoXOusWl0CPnNbJdl/5nYbiNDADGhiUdaLtZoU8sb5iKUifnr89PvQRMVIwtjOeJHpXc0kDRrw+z4zrNlOH2N/LcAjg0WOKT19B1s+LBypnfY24zXgaTEOxzPhqooZMDgIM8KvSqoV+iwFtgo7+PBnry7j/GzFSg91CNTWK6JKB6yk+dqg04SrN+Tw/X/Lmhh6fshWkVKTuZovxp/g=="
+	sessionKey := "nClNe9ciHfYQZIa5CWtnkg=="
+	Base64_DecodeIv := "okoPcc0wFtQUn4E8+ksWZA=="
+
+	bytesPassMsg, _ := base64.StdEncoding.DecodeString(encryptedMsg)
+	Base64_DecodeIv1, _ := base64.StdEncoding.DecodeString(Base64_DecodeIv)
+	sessionKey1, _ := base64.StdEncoding.DecodeString(sessionKey)
+
+	decryptedMsg, err := AESCBC16Decrypt(sessionKey1, Base64_DecodeIv1, bytesPassMsg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Fatal(string(decryptedMsg))
+
+	//data, err := AESCBCDecpryt(bytesPass, []byte(sessionKey), []byte(Base64_Decode))
+	//if err != nil {
+	//	t.Fatal(err)
+	//}
+	//t.Fatal(data)
+
+}