C#与 微信小程序 互为加解密方案

    <script type="text/javascript" src="/content/plugin/CryptoJSv3.1.2/components/core-min.js"></script>
    <script type="text/javascript" src="/content/plugin/CryptoJSv3.1.2/rollups/aes.js"></script>

 1     com.str = {
 2         _KEY: "12345678900000001234567890000000",//32位
 3         _IV: "1234567890000000",//16位
 4         /**************************************************************
 5         *字符串加密
 6         *   str：需要加密的字符串
 7         ****************************************************************/
 8         Encrypt: function (str) {
 9             var key = CryptoJS.enc.Utf8.parse(this._KEY); 
10             var iv = CryptoJS.enc.Utf8.parse(this._IV);
11 
12             var encrypted = ‘‘;
13 
14             var srcs = CryptoJS.enc.Utf8.parse(str);
15             encrypted = CryptoJS.AES.encrypt(srcs, key, {
16                 iv: iv,
17                 mode: CryptoJS.mode.CBC,
18                 padding: CryptoJS.pad.Pkcs7
19             });
20 
21             return encrypted.ciphertext.toString();
22         },
23 
24         /**************************************************************
25         *字符串解密
26         *   str：需要解密的字符串
27         ****************************************************************/
28         Decrypt: function (str) {
29             var key = CryptoJS.enc.Utf8.parse(this._KEY);
30             var iv = CryptoJS.enc.Utf8.parse(this._IV);
31             var encryptedHexStr = CryptoJS.enc.Hex.parse(str);
32             var srcs = CryptoJS.enc.Base64.stringify(encryptedHexStr);
33             var decrypt = CryptoJS.AES.decrypt(srcs, key, {
34                 iv: iv,
35                 mode: CryptoJS.mode.CBC,
36                 padding: CryptoJS.pad.Pkcs7
37             });
38             var decryptedStr = decrypt.toString(CryptoJS.enc.Utf8);
39             return decryptedStr.toString();
40         }
41     }

const string AES_IV = "1234567890000000";//16位    

const string key   ="12345678900000001234567890000000" //测试密钥

    /// <summary>  
    /// AES加密算法  
    /// </summary>  
    /// <param name="input">明文字符串</param>  
    /// <param name="key">密钥（32位）</param>  
    /// <returns>字符串</returns>  
    public static string EncryptByAES(string input, string key)
    {
        byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 32));
        using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
        {
            aesAlg.Key = keyBytes;
            aesAlg.IV = Encoding.UTF8.GetBytes(AES_IV.Substring(0, 16));

            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        swEncrypt.Write(input);
                    }
                    byte[] bytes = msEncrypt.ToArray();
                    return ByteArrayToHexString(bytes);
                }
            }
        }
    }

    /// <summary>  
    /// AES解密  
    /// </summary>  
    /// <param name="input">密文字节数组</param>  
    /// <param name="key">密钥（32位）</param>  
    /// <returns>返回解密后的字符串</returns>  
    public static string DecryptByAES(string input, string key)
    {
        byte[] inputBytes = HexStringToByteArray(input); 
        byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 32));
        using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
        {
            aesAlg.Key = keyBytes;
            aesAlg.IV = Encoding.UTF8.GetBytes(AES_IV.Substring(0, 16));

            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
            using (MemoryStream msEncrypt = new MemoryStream(inputBytes))
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srEncrypt = new StreamReader(csEncrypt))
                    {
                        return srEncrypt.ReadToEnd();
                    }
                }
            }
        }
    }

    /// <summary>
    /// 将指定的16进制字符串转换为byte数组
    /// </summary>
    /// <param name="s">16进制字符串(如：“7F 2C 4A”或“7F2C4A”都可以)</param>
    /// <returns>16进制字符串对应的byte数组</returns>
    public static byte[] HexStringToByteArray(string s)
    {
        s = s.Replace(" ", "");
        byte[] buffer = new byte[s.Length / 2];
        for (int i = 0; i < s.Length; i += 2)
            buffer[i / 2] = (byte)Convert.ToByte(s.Substring(i, 2), 16);
        return buffer;
    }

    /// <summary>
    /// 将一个byte数组转换成一个格式化的16进制字符串
    /// </summary>
    /// <param name="data">byte数组</param>
    /// <returns>格式化的16进制字符串</returns>
    public static string ByteArrayToHexString(byte[] data)
    {
        StringBuilder sb = new StringBuilder(data.Length * 3);
        foreach (byte b in data)
        {
            //16进制数字
            sb.Append(Convert.ToString(b, 16).PadLeft(2, ‘0‘));
            //16进制数字之间以空格隔开
            //sb.Append(Convert.ToString(b, 16).PadLeft(2, ‘0‘).PadRight(3, ‘ ‘));
        }
        return sb.ToString().ToUpper();
    }

com.str.Encrypt("2017-05")//结果：68f4a7903a9fe6085d2301ac68cc039c
com.str.Decrypt("68f4a7903a9fe6085d2301ac68cc039c")//结果：2017-05

//加密
string str1 = Encrypt.EncryptByAES("2017-05", "12345678900000001234567890000000");
//解密
string str2 = Encrypt.DecryptByAES("68f4a7903a9fe6085d2301ac68cc039c", "12345678900000001234567890000000");