public static string getMD5(string str)//该方法获取字符串的md5加密 通常用来验证数据
{
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] pwd = md5.ComputeHash(Encoding.ASCII.GetBytes(str));
string ret = "";
for (int i = 0; i < pwd.Length; i++)
{
ret += pwd[i].ToString("X");
}
return ret;
}
private static string GetMD5HashFromFile(string fileName)//该方法用来进行获取文件的md5加密 用来比对 客户端文件是否被篡改
{
try
{
FileStream file = new FileStream(fileName, FileMode.Open);
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] retVal = md5.ComputeHash(file);
file.Close();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < retVal.Length; i++)
{
// sb.Append(retVal[i].ToString("x2"));
sb.Append(retVal[i].ToString("X"));
}
return sb.ToString();
}
catch (Exception ex)
{
throw new Exception("GetMD5HashFromFile() fail,error:" + ex.Message);
}
}
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