這是很久以前的寫的一篇博客了,今天把他重新找出來整理一下發布到博客園
當時對接銀聯的時候搞了很久都沒搞出來,後來一個偶然的機會發現類似的一個代碼參考了一下終於弄好了
這段代碼主要是實現了C#服務端對接手機銀聯的java端的接口的簽名
希望可以幫到大家
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Security.Cryptography.X509Certificates;
6 using System.Security.Cryptography;
7
8 namespace MD5WithRSATest
9 {
10 public class MD5WithRSA
11 {
12 private static char[] bcdLookup = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
13
14 /// <summary>
15 /// 返回MD5WithRSA的簽名字符串
16 /// </summary>
17 /// <param name="fileName">pfx證書文件的路徑</param>
18 /// <param name="password">pfx證書密碼</param>
19 /// <param name="strdata">待簽名字符串</param>
20 /// <param name="encoding">字符集,默認為ISO-8859-1</param>
21 /// <returns>返回MD5WithRSA的簽名字符串</returns>
22 public static string SignData(string fileName, string password, string strdata, string encoding = "ISO-8859-1")
23 {
24 X509Certificate2 objx5092;
25 if (string.IsNullOrWhiteSpace(password))
26 {
27 objx5092 = new X509Certificate2(fileName);
28 }else
29 {
30 objx5092 = new X509Certificate2(fileName, password);
31 }
32 RSACryptoServiceProvider rsa = objx5092.PrivateKey as RSACryptoServiceProvider;
33 byte[] data = Encoding.GetEncoding(encoding).GetBytes(strdata);
34 byte[] hashvalue = rsa.SignData(data, "MD5");//為證書采用MD5withRSA 簽名
35 return bytesToHexStr(hashvalue);///將簽名結果轉化為16進制字符串
36 }
37 /// <summary>
38 /// 將簽名結果轉化為16進制字符串
39 /// </summary>
40 /// <param name="bcd">簽名結果的byte數字</param>
41 /// <returns>16進制字符串</returns>
42 private static string bytesToHexStr(byte[] bcd)
43 {
44 StringBuilder s = new StringBuilder(bcd.Length * 2);
45 for (int i = 0; i < bcd.Length; i++)
46 {
47 s.Append(bcdLookup[(bcd[i] >> 4) & 0x0f]);
48 s.Append(bcdLookup[bcd[i] & 0x0f]);
49 }
50 return s.ToString();
51 }
52 }
53 }
