wklken · September 22, 2016 07:00 · Sep 22, 2016
diff --git a/deencrypt_3des.go b/deencrypt_3des.go
@@ -0,0 +1,47 @@
+package main
+
+// reference: https://golang.org/pkg/crypto/des/
+// reference: http://blog.studygolang.com/2013/01/go%E5%8A%A0%E5%AF%86%E8%A7%A3%E5%AF%86%E4%B9%8Bdes/
+
+import (
+	"crypto/cipher"
+	"crypto/des"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+)
+
+// 3DES解密
+func TripleDesDecrypt(crypted, key []byte) ([]byte, error) {
+	block, err := des.NewTripleDESCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	// note: IV = key[:8]
+	blockMode := cipher.NewCBCDecrypter(block, key[:8])
+	origData := make([]byte, len(crypted))
+	// origData := crypted
+	blockMode.CryptBlocks(origData, crypted)
+	return origData, nil
+}
+
+func main() {
+	data := "a6rzP8ogj4bD2woh7tDBk0gBYtyhgzJhxOrvse0f8hyQUem+V9skOnOp4q+81R5Cs+gPDdUxtGFdITLVUaTjVUOQiGD8scBTWVL71F9BQUNjug28kD7RCV1kDHwJWU5ReiaKPnT0EzaYpzeppvWbPPUxXD30iFwLN0y0DMnQYo0PR8XkyMbgEg=="
+	raw_data, _ := base64.StdEncoding.DecodeString(data)
+
+	fmt.Println(string(raw_data))
+	// encrypted_data := string(raw_data)
+
+	key := []byte("aaaaaaaaaaaaaaaaaaaaaaaa")
+
+	result, _ := TripleDesDecrypt(raw_data, key)
+	fmt.Println("result:")
+	fmt.Println(string(result))
+
+	var f interface{}
+	err := json.Unmarshal(result, &f)
+	if err != nil {
+		fmt.Println("decode json fail")
+	}
+
+}
diff --git a/encrypt_3des.py b/encrypt_3des.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+# pip install pycrypto
+# 3des, cbc mode
+
+import json
+import base64
+from Crypto.Cipher import DES3
+
+def pad(text):
+    """
+    补齐为8的倍数
+    """
+    ext_byte_count = len(text) % 8
+    if ext_byte_count == 0:
+        return text
+
+    add_byte_count = 8 - ext_byte_count
+    return text + ' ' * add_byte_count
+
+def tobase64(encrypt_data):
+    """
+    base64
+    """
+    return base64.b64encode(encrypt_data)
+
+# 1. must be 16/24 bytes, 约定好
+secret_key = 'a' * 24
+
+
+# 2. 表单数据获取拼json, 或者其他格式, 需要和engine约定好
+data = {
+    'app_code': 'test',
+    'auth_token': 'xxxxxxxxxx',
+    'mac': '10:dd:b1:ff:fe:37:cd:90,10:dd:b1:ff:fe:37:cd:90,10:dd:b1:ff:fe:37:cd:90'
+}
+
+data_string = json.dumps(data)
+data_string = pad(data_string)
+
+print 'before encrypt: ', data_string
+
+# 3. 加密
+# use triple des
+des3 = DES3.new(secret_key, mode=DES3.MODE_CBC, IV=secret_key[:8])
+#  des3 = DES3.new(secret_key)
+encrypt_data = des3.encrypt(data_string)
+
+print "after encrypt:", encrypt_data
+
+# 4. 给用户的, 再base64, 因为加密后存在很多特殊的字符
+
+raw_base64 = tobase64(encrypt_data)
+print "tobase64: ", raw_base64
+
+
+# 5. 示例, 解密
+# note: 反向解开不能用同一个对象
+raw_data = base64.b64decode(raw_base64)
+des32 = DES3.new(secret_key, mode=DES3.MODE_CBC, IV=secret_key[:8])
+#  des32 = DES3.new(secret_key)
+raw_base64 = des32.decrypt(raw_data)
+print "after deencrypt: ", json.loads(raw_base64)