/// <summary>
/// 使用UTF-8进行MD5签名
/// 忽略参数中存的_queue_sign和value为空的键值对
/// 最后&key={key}
/// </summary>
/// <param name="parameters"></param>
/// <param name="key">签名密钥</param>
/// <returns></returns>
public static string Sign(IDictionary parameters, string key, MD5_Format format = MD5_Format.UPPER)
{
string str_sign = string.Empty;
if (parameters != null && parameters.Count > 0)
{
Dictionary <string, string> parameters_temp = new Dictionary <string, string>();
foreach (DictionaryEntry item in parameters)
{
string val = (item.Value == null)
? string.Empty
: item.Value.ToString();
parameters_temp.Add((string)item.Key, val);
}
str_sign = _Sign(parameters_temp, key, format);
}
return(str_sign);
}
/// <summary>
/// 给请求参数签名
/// </summary>
/// <param name="parameters">所有字符型的请求参数，忽略参数中存的_queue_sign</param>
/// <param name="key">签名密钥</param>
/// <param name="qhs">是否前后都加密钥进行签名</param>
/// <returns>签名</returns>
private static string _Sign(IDictionary <string, string> parameters, string key, MD5_Format format)
{
// 第一步：把字典按Key的字母顺序排序
IDictionary <string, string> sortedParams = new SortedDictionary <string, string>(parameters);
IEnumerator <KeyValuePair <string, string> > dem = sortedParams.GetEnumerator();
// 第二步：把所有参数名和参数值串在一起
StringBuilder query = new StringBuilder();
while (dem.MoveNext())
{
string _key = dem.Current.Key;
string value = dem.Current.Value;
if (!string.IsNullOrWhiteSpace(_key) && !string.IsNullOrWhiteSpace(value))
{
//忽略_queue_sign参数
if (_key.Equals("_queue_sign", StringComparison.OrdinalIgnoreCase))
{
continue;
}
query.Append("&").Append(_key).Append("=").Append(value);
}
}
query.Append("&key=").Append(key ?? string.Empty);
StringBuilder result = new StringBuilder();
// 第三步：使用MD5加密
using (System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider())
//using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
{
byte[] bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(query.ToString().Trim('&')));
// 第四步：把二进制转化为大写的十六进制
for (int i = 0; i < bytes.Length; i++)
{
string hex = string.Empty;
if (format == MD5_Format.UPPER)
{
hex = bytes[i].ToString("X2"); //大写
}
else
{
hex = bytes[i].ToString("x2"); //小写
}
result.Append(hex);
}
}
return(result.ToString());
}
