C# MD5,SHA1,SHA256,SHA384,SHA512加密,DES自定义加密

C# MD5,SHA1,SHA256,SHA384,SHA512加密,DES自定义加密

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

/// <summary>
/// 传入明文，返回用MD5加密后的字符串
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>MD5加密后的字符串</returns>
public static string ToMD5_32(string str)
{
    string passwordFormat = System.Web.Configuration.FormsAuthPasswordFormat.MD5.ToString();
    return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, passwordFormat);
}

/// <summary>
/// 传入明文，返回用SHA1密后的字符串
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>SHA1加密后的字符串</returns>
public static string ToSHA1(string str)
{
    string passwordFormat = System.Web.Configuration.FormsAuthPasswordFormat.SHA1.ToString();
    return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, passwordFormat);
}

/// <summary>
/// 传入明文，返回用SHA256密后的字符串
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>SHA256加密后的字符串</returns>
public static string ToSHA256(string str)
{
    byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
    SHA256Managed Sha256 = new SHA256Managed();
    byte[] by = Sha256.ComputeHash(SHA256Data);
    Sha256.Dispose();
    return BitConverter.ToString(by).Replace("-", "");
}
/// <summary>
/// 传入明文，返回用SHA384密后的字符串
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>SHA384加密后的字符串</returns>
public static string ToSHA384(string str)
{
    byte[] SHA384Data = Encoding.UTF8.GetBytes(str);
    SHA384Managed Sha384 = new SHA384Managed();
    byte[] by = Sha384.ComputeHash(SHA384Data);
    Sha384.Dispose();
    return BitConverter.ToString(by).Replace("-", "");
}
/// <summary>
/// 传入明文，返回用SHA512密后的字符串
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>SHA512加密后的字符串</returns>
public static string ToSHA512(string str)
{
    byte[] SHA512Data = Encoding.UTF8.GetBytes(str);
    SHA512Managed Sha512 = new SHA512Managed();
    byte[] by = Sha512.ComputeHash(SHA512Data);
    Sha512.Dispose();
    return BitConverter.ToString(by).Replace("-", "");
}
/// <summary>
/// DES加密,私有方法
/// </summary>
/// <param name="str">要加密字符串</param>
/// <param name="salt">盐值</param>
/// <returns></returns>
public static string DESEncrypt(string str,string salt)
{
    try
    {
        byte[] key = Encoding.Unicode.GetBytes(salt);
        byte[] data = Encoding.Unicode.GetBytes(str);
        DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();
        MemoryStream MStream = new MemoryStream();
        CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);
        CStream.Write(data, 0, data.Length);
        CStream.FlushFinalBlock();
        byte[] temp = MStream.ToArray();
        CStream.Close();
        MStream.Close();
        descsp.Dispose();
        return Convert.ToBase64String(temp);
    }
    catch
    {
        return "";
    }
}
/// <summary>
/// DES解密,私有方法
/// </summary>
/// <param name="str">要解密的字符串</param>
/// <param name="salt">盐值</param>
/// <returns></returns>
public static string DESDecrypt(string str,string salt)
{
    try
    {
        byte[] key = Encoding.Unicode.GetBytes(salt);
        byte[] data = Convert.FromBase64String(str);
        DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();
        MemoryStream MStream = new MemoryStream();
        CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);
        CStream.Write(data, 0, data.Length);
        CStream.FlushFinalBlock();
        byte[] temp = MStream.ToArray();
        CStream.Close();
        MStream.Close();
        descsp.Dispose();
        return Encoding.Unicode.GetString(temp);
    }
    catch
    {
        return "";
    }
}