支付相关-算法知识1

//加密字符串
    public string Encryption(string toE)
    {
        //加密和解密必须采用相同的key，具体自己填写，但是必须为32位
        byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678123456781234567812345678");
        RijndaelManaged rijndaelManaged = new RijndaelManaged();
        rijndaelManaged.Key = keyArray;
        rijndaelManaged.Mode = CipherMode.ECB;
        rijndaelManaged.Padding = PaddingMode.PKCS7;
        ICryptoTransform icryptoTransform = rijndaelManaged.CreateEncryptor();

        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toE);
        byte[] resultArray = icryptoTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        return Convert.ToBase64String( resultArray, 0, resultArray.Length);
    }

    //解密字符串
    public string Decryption(string toD)
    { 
        //加密和解密必须采用相同的key，具体值自己填，但是必须为32位
        byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678123456781234567812345678");
        RijndaelManaged rijndaelManaged = new RijndaelManaged();
        rijndaelManaged.Key = keyArray;
        rijndaelManaged.Mode = CipherMode.ECB;
        rijndaelManaged.Padding = PaddingMode.PKCS7;
        ICryptoTransform cTransform = rijndaelManaged.CreateDecryptor();

        byte[] toEncryptArray = Convert.FromBase64String(toD);
        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        return UTF8Encoding.UTF8.GetString(resultArray);
    }

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参考资料：C# And Java 3DES加解密 ECB模式/PKCS7

还需要仔细看，不太符合想找的资料

参考资料：如何在C#里面实现Java中的PKCS7加密的功能？

资料地址：https://bbs.csdn.net/topics/340147880

一

/// <summary>
        /// 创建签名
        /// </summary>
        /// <param name="data">标签数据</param>
        /// <returns></returns>
        private static byte [] CreateSign(byte[] data)
        {
            if (data == null)
                throw new ArgumentNullException("数据不能为空");

            X509Certificate2 userCert = CreateCertificate(ConfigInfo.certFileName,ConfigInfo.Password);
            if (userCert == null)
                throw new ArgumentNullException("证书不能为空");

            ContentInfo content = new ContentInfo(data);//设置要签名的数据
            SignedCms signedCms = new SignedCms(content);
            CmsSigner signer = new CmsSigner(userCert);
            try
            {
                signedCms.ComputeSignature(signer);//创建签名
                return signedCms.Encode();
            }
            catch (CryptographicException ex)
            {
                throw ex;
            }

        }

二

/// <summary>
        /// 创建证书
        /// </summary>
        /// <param name="fileName">文件名称</param>
        /// <param name="password">密码</param>
        /// <returns></returns>
        public static X509Certificate2 CreateCertificate(string fileName, string password)
        {
            if (string.IsNullOrEmpty(fileName) || string.IsNullOrEmpty(password))
            {
                return null;
            }
            try
            {
                return new X509Certificate2(fileName, password, X509KeyStorageFlags.Exportable);
            }
            catch (CryptographicException ex)
            {
                throw ex;
            }
        }

三

/// <summary>
        /// 校验签名
        /// </summary>
        /// <param name="signature">标签数据</param>
        /// <param name="certificate">证书</param>
        /// <returns></returns>
        public static bool Verify(byte[] signature, byte[] data)
        {
            ContentInfo contentInfo = new ContentInfo(data);
            SignedCms verifyCms = new SignedCms(contentInfo,true);
            try
            {
                verifyCms.Decode(signature);
                verifyCms.CheckSignature(true);
                return true;
            }
            catch (CryptographicException ex)
            {
                ServiceHub.AddLog(RuntimeLogType.Exception, null, "签名解码失败:" + ex.Message, ex.StackTrace);
                throw ex;
            }
        }