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C# 实现MD5withRSA签名算法的加密

admin2年前 (2024-01-05)C#与C++5050 修订时间：2024-01-05 13:38:45

规则

签名算法：MD5withRSA

1.参数名ASCII码从小到大排序

2.如果参数的值为空（null 或者空字符串）不参与签名

3.参数名区分大小写

4.sign参数不参与签名

实现

1、引入BouncyCastle.Crypto类库

2、参数名ASCII码从小到大排序

使用Newtonsoft.Json序列化的JSON，除非人为指定排序规则，则默认为AsciiAsc排序方式。C# 使用Newtonsoft.Json进行对象序列化、JSON反序列化的方法

我们可以这么实现，示例代码:

2.1 json代码：

{
  "nonceStr": "z0o66TGb08u10i8pwk5Rr",
  "authAppKey": "Pny5BAdcrZH1KDSU2VbhAF",
  "timestamp": "1668783983693"
}

2.2 json转Dictionary<string, string>

string json = JSON串
var Attributes = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);

使用Newtonsoft.Json的反序列化JsonConvert.DeserializeObject<Dictionary<string, string>>(json)转换为Dictionary<string, string>格式；

2.3 转换Dictionary<string, string>为特定格式

示例格式（AsciiAsc）：

authAppKey=Pny5BAdcrZH1KDSU2VbhAF&nonceStr=z0o66TGb08u10i8pwk5Rr&timestamp=1668783983693

转换方法（该方法可Ascii排序）

        private static String AsciiAsc(Dictionary<String, String> dic)
        {
            //Ascii升序排序
            var sortResult3 = from pair in dic orderby pair.Key ascending select pair;
            StringBuilder sb = new StringBuilder();
            foreach (KeyValuePair<String, String> p in sortResult3)
            {
                //格式化输出生成串
                sb.Append(p.Key).Append("=").Append(p.Value).Append('&');
            }
            //去除末尾多余字符
            string ls_str = sb.ToString();
            ls_str = ls_str.Substring(0, ls_str.Length - 1);
            return ls_str;
        }

        private static String AsciiDesc(Dictionary<String, String> dic)
        {
            //Ascii降序排序
            var sortResult3 = from pair in dic orderby pair.Key descending select pair;
            StringBuilder sb = new StringBuilder();
            foreach (KeyValuePair<String, String> p in sortResult3)
            {
                //格式化输出生成串
                sb.Append(p.Key).Append("=").Append(p.Value).Append('&');
            }
            //去除末尾多余字符
            string ls_str = sb.ToString();
            ls_str = ls_str.Substring(0, ls_str.Length - 1);
            return ls_str;
        }

4、MD5withRSA.cs 类库文件

using System;
using System.Text;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;

namespace UnifyPayPlatAPI.MD5withRSA
{
    public class md5withRsa
    {
        public Encoding encoding = Encoding.GetEncoding("GBK");
        public string SignerSymbol = "MD5withRSA";
        public md5withRsa() { }
        public md5withRsa(Encoding e, string s)
        {
            encoding = e;
            SignerSymbol = s;
        }
        private AsymmetricKeyParameter CreateKEY(bool isPrivate, string key)
        {
            byte[] keyInfoByte = Convert.FromBase64String(key);
            if (isPrivate)
                return PrivateKeyFactory.CreateKey(keyInfoByte);
            else
                return PublicKeyFactory.CreateKey(keyInfoByte);
        }
        /// <summary>
        /// 数据签名
        /// </summary>
        /// <param name="content">待加密字符串</param>
        /// <param name="privatekey">私钥</param>
        /// <returns>加密后字符串</returns>
        public string SignMD5withRsa(string content, string privatekey)
        {
            ISigner sig = SignerUtilities.GetSigner(SignerSymbol);
            sig.Init(true, CreateKEY(true, privatekey));
            var bytes = encoding.GetBytes(content);
            sig.BlockUpdate(bytes, 0, bytes.Length);
            byte[] signature = sig.GenerateSignature();
            //使用Base64转换sig，8-bit
            var signedString = Convert.ToBase64String(signature);
            return signedString;
        }
        /// <summary>
        /// 验证签名
        /// </summary>
        /// <param name="content">待签名的字符串</param>
        /// <param name="signData">加密后的文本</param>
        /// <param name="publickey">公钥文本</param>
        /// <returns>是否一致</returns>
        public bool VerifyMD5withRsa(string content, string signData, string publickey)
        {
            ISigner signer = SignerUtilities.GetSigner(SignerSymbol);
            signer.Init(false, CreateKEY(false, publickey));
            var expectedSig = Convert.FromBase64String(signData);
            var msgBytes = encoding.GetBytes(content);
            signer.BlockUpdate(msgBytes, 0, msgBytes.Length);
            return signer.VerifySignature(expectedSig);
        }
    }

}

5、加密方式

using System;
using System.Text;
using System.Windows.Forms;
using UnifyPayPlatAPI.APIModels;
using UnifyPayPlatAPI.MD5withRSA;

namespace UnifyPayPlatAPI
{
    public partial class ASCIIasc : Form
    {
        public ASCIIasc()
        {
            InitializeComponent();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            md5withRsa withRsa = new md5withRsa();
            richTextBox4.Text = withRsa.SignMD5withRsa(richTextBox2.Text, richTextBox3.Text);
        }
    }
}

5.1 加密密钥

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

5.2 加密结果

YUZrkpRSuQgUvg4NTG6nzby2RRvaPoOw1D3rl8Co53+nMcYgQWsExHAWLUuSqqBzvtAIS3LolFJxQUAiEWve6syDNo1KAtT6veMRrD0Fjn9gMnrECanKF9otLJuPzsdhVPLDIkMLQxunAlbI2SWaB9H+0q+Rfo9bWS4VbHWJ1A8=