c#加密

转自：https://blog.csdn.net/u011127019/article/details/51384246

一、SHA加密

/// <summary>  
/// SHA1 加密，返回大写字符串  
/// </summary>  
/// <param name="content">需要加密字符串</param>  
/// <returns>返回40位UTF8 大写</returns>  
public static string SHA1(string content)  
{  
    return SHA1(content, Encoding.UTF8);  
}  
/// <summary>  
/// SHA1 加密，返回大写字符串  
/// </summary>  
/// <param name="content">需要加密字符串</param>  
/// <param name="encode">指定加密编码</param>  
/// <returns>返回40位大写字符串</returns>  
public static string SHA1(string content, Encoding encode)  
{  
    try  
    {  
        SHA1 sha1 = new SHA1CryptoServiceProvider();  
        byte[] bytes_in = encode.GetBytes(content);  
        byte[] bytes_out = sha1.ComputeHash(bytes_in);  
        sha1.Dispose();  
        string result = BitConverter.ToString(bytes_out);  
        result = result.Replace("-", "");  
        return result;  
    }  
    catch (Exception ex)  
    {  
        throw new Exception("SHA1加密出错：" + ex.Message);  
    }  
}  

二、md5加密

2.使用标准MD5CryptoServiceProvider 方法1

//方法1  
//默认小写 32位加密  
public static string GetMd532(string str)  
{  
    MD5CryptoServiceProvider crypto = new MD5CryptoServiceProvider();  
    byte[] bytes = Encoding.UTF8.GetBytes(str);  
    bytes = crypto.ComputeHash(bytes);  
    StringBuilder builder = new StringBuilder();  
    foreach (var item in bytes)  
    {  
        builder.AppendFormat("{0:x2}", item);  
    }  
    return builder.ToString();  
}  
//默认小写 16位加密  
public static string GetMd516(string str)  
{  
    return GetMd532(str).Substring(8, 16);  
}  

　3.使用标准MD5CryptoServiceProvider 方法2（推荐）

//方法2  
//默认大写 32位加密  
public static string GetMd5_32(string str)  
{  
    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();  
    byte[] bytes = Encoding.UTF8.GetBytes(str);  
    string result = BitConverter.ToString(md5.ComputeHash(bytes));  
    return result.Replace("-", "");  
}  
//默认大写 16位加密  
public static string GetMd5_16(string str)  
{  
    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();  
    byte[] bytes = Encoding.UTF8.GetBytes(str);  
    string result = BitConverter.ToString(md5.ComputeHash(bytes),4,8);  
    return result.Replace("-", "");  
}  

　　4.测试

string str = "张三";  
Console.WriteLine("FormsAuthentication:" + Md5Operate.HashMD5_String(str));  
Console.WriteLine();  
Console.WriteLine("md532:" + Md5Operate.GetMd532(str));  
Console.WriteLine();  
Console.WriteLine("md516:" + Md5Operate.GetMd516(str));  
Console.WriteLine();  
Console.WriteLine("md5_32:" + Md5Operate.GetMd5_32(str));  
Console.WriteLine();  
Console.WriteLine("md5_16:" + Md5Operate.GetMd5_16(str));