天瑞融通 API接口使用到的C#加密方法

Aes.cs

private static string AesEncrypt(string cleartext, string password)
{
    var aes = Aes.Create();
    var sha1 = SHA1.Create();
    byte[] hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(password));
    var rd = sha1.ComputeHash(hash);
    var keyArray = rd.Take(16).ToArray();
    aes.Key = keyArray;
    aes.Mode = CipherMode.ECB;
    var byteBuff = Encoding.UTF8.GetBytes(cleartext);
    var result = aes.CreateEncryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length);
    return ParseByte2HexStr(result);
}
private static string ParseByte2HexStr(byte[] buf)
{

   var sb = new StringBuilder();

	for (int i = 0; i < buf.Length; i++)
	{
		sb.Append(buf[i].ToString("X2").ToLower());
	}

	return sb.ToString();
}

Signature.cs

 static string GenerateSignatureUrl(string method, string path, int expires, Dictionary<string, string> queryStrings)
  {
      var Expires = expires.ToString();
      var Timestamp = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssZ");
      var sortedDic = new SortedDictionary<string, string>(queryStrings ?? new Dictionary<string, string>());
      var urlParam = new StringBuilder();
      urlParam.Append($"{path}?");
      var @params = new List<string>()
      {
          $"{nameof(_config.AccessKeyId)}={UrlEncode(_config.AccessKeyId)}",
          $"{nameof(Expires)}={UrlEncode(Expires)}",
          $"{nameof(Timestamp)}={UrlEncode(Timestamp)}"
      };
      foreach (var k in sortedDic)
      {
          @params.Add($"{k.Key}={UrlEncode(k.Value)}");
      }
      urlParam.Append(string.Join("&", @params));
      var p = $"{method.ToUpper()}{_domain}" + urlParam.ToString();
      var Signature = UrlEncode(Convert.ToBase64String(HmacSha1(Encoding.UTF8.GetBytes(p), Encoding.UTF8.GetBytes(_config.AccessKeySecret))));
      urlParam.Append($"&{nameof(Signature)}={Signature}");
      return urlParam.ToString();
  }
  static string UrlEncode(string str) => WebUtility.UrlEncode(str);
  static byte[] HmacSha1(byte[] byteArray, byte[] key)
  {
      using var myhmacsha1 = new HMACSHA1(key);
      var hashArray = myhmacsha1.ComputeHash(byteArray);
      return hashArray;
  }