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一、MD5加密解密
1、加密
public static string ToMd5(string clearString)
{
Byte[] clearBytes = System.Text.Encoding.Unicode.GetBytes(clearString);
string hashedPwd = BitConverter.ToString(((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes));
return hashedPwd;
}
2、32位MD5加密
public static string GetMd5Base32(string sInput)
{
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
System.Security.Cryptography.MD5 md5;
byte[] bytesSrc;
byte[] result;
StringBuilder sb = new StringBuilder();
bytesSrc = encoding.GetBytes(sInput);
md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
result = md5.ComputeHash(bytesSrc);
for (int i = 0; i < result.Length; i++)
{
sb.AppendFormat("{0:x2}", result[i]);
}
return sb.ToString();
}
二、base64算法加密解密
/// <summary>
/// 有关base64编码算法的相关操作
/// </summary>
public class Base64
{
public Base64()
{
}
/// <summary>
/// 将字符串使用base64算法加密
/// </summary>
/// <param name="sourceString">待加密的字符串</param>
/// <param name="ens">System.Text.Encoding 对象，如创建中文编码集对象：System.Text.Encoding.GetEncoding(54936)</param>
/// <returns>加码后的文本字符串</returns>
public static string EncodingForString(string sourceString, System.Text.Encoding ens)
{
return Convert.ToBase64String(ens.GetBytes(sourceString));
}
/// <summary>
/// 将字符串使用base64算法加密
/// </summary>
/// <param name="sourceString">待加密的字符串</param>
/// <returns>加码后的文本字符串</returns>
public static string EncodingForString(string sourceString)
{
return EncodingForString(sourceString, System.Text.Encoding.GetEncoding(54936));
}
/// <summary>
/// 从base64编码的字符串中还原字符串，支持中文
/// </summary>
/// <param name="base64String">base64加密后的字符串</param>
/// <param name="ens">System.Text.Encoding 对象，如创建中文编码集对象：System.Text.Encoding.GetEncoding(54936)</param>
/// <returns>还原后的文本字符串</returns>
public static string DecodingForString(string base64String, System.Text.Encoding ens)
{
/**
* ***********************************************************
*
* 从base64String中取得的字节值为字符的机内码（ansi字符编码）
* 一般的，用机内码转换为汉字是公式：
* (char)(第一字节的二进制值*256+第二字节值)
* 而在c#中的char或string由于采用了unicode编码，就不能按照上面的公式计算了
* ansi的字节编和unicode编码不兼容
* 故利用.net类库提供的编码类实现从ansi编码到unicode代码的转换
*
* GetEncoding 方法依赖于基础平台支持大部分代码页。但是，对于下列情况提供系统支持：默认编码，即在执行此方法的计算机的区域设置中指定的编码；Little- Endian Unicode (UTF-16LE)；Big-Endian Unicode (UTF-16BE)；Windows 操作系统 (windows-1252)；UTF-7；UTF-8；ASCII 以及 GB18030（简体中文）。
*
*指定下表 中列出的其中一个名称以获取具有对应代码页的系统支持的编码。
*
* 代码页 名称
* 1200 “UTF-16LE”、“utf-16”、“ucs-2”、“unicode”或“ISO-10646-UCS-2”
* 1201 “UTF-16BE”或“unicodeFFFE”
* 1252 “windows-1252”
* 65000 “utf-7”、“csUnicode11UTF7”、“unicode-1-1-utf-7”、“unicode-2-0-utf-7”、“x- unicode-1-1-utf-7”或“x-unicode-2-0-utf-7”
* 65001 “utf-8”、“unicode-1-1-utf-8”、“unicode-2-0-utf-8”、“x-unicode-1-1-utf-8”或 “x-unicode-2-0-utf-8”
* 20127 “us-ascii”、“us”、“ascii”、“ANSI_X3.4-1968”、“ANSI_X3.4-1986”、“cp367”、 “csASCII”、“IBM367”、“iso-ir-6”、“ISO646-US”或“ISO_646.irv:1991”
* 54936 “GB18030”
*
* 某些平台可能不支持特定的代码页。例如，Windows 98 的美国版本可能不支持日语 Shift-jis 代码页（代码页 932）。这种情况下，GetEncoding 方法将在执行下面的 C# 代码时引发 NotSupportedException：
*
* Encoding enc = Encoding.GetEncoding("shift-jis");
**************************************************************/
// 从base64String中得到原始字符
return ens.GetString(Convert.FromBase64String(base64String));
}
/// <summary>
/// 从base64编码的字符串中还原字符串，支持中文
/// </summary>
/// <param name="base64String">base64加密后的字符串</param>
/// <returns>还原后的文本字符串</returns>
public static string DecodingForString(string base64String)
{
return DecodingForString(base64String, System.Text.Encoding.GetEncoding(54936));
}
//--------------------------------------------------------------------------------------
/// <summary>
/// 对任意类型的文件进行base64加码
/// </summary>
/// <param name="fileName">文件的路径和文件名</param>
/// <returns>对文件进行base64编码后的字符串</returns>
public static string EncodingForFile(string fileName)
{
System.IO.FileStream fs = System.IO.File.OpenRead(fileName);
System.IO.BinaryReader br = new System.IO.BinaryReader(fs);
/*System.Byte[] b=new System.Byte[fs.Length];
fs.Read(b,0,Convert.ToInt32(fs.Length));*/
string base64String = Convert.ToBase64String(br.ReadBytes((int)fs.Length));
br.Close();
fs.Close();
return base64String;
}
/// <summary>
/// 把经过base64编码的字符串保存为文件
/// </summary>
/// <param name="base64String">经base64加码后的字符串</param>
/// <param name="fileName">保存文件的路径和文件名</param>
/// <returns>保存文件是否成功</returns>
public static bool SaveDecodingToFile(string base64String, string fileName)
{
System.IO.FileStream fs = new System.IO.FileStream(fileName, System.IO.FileMode.Create);
System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);
bw.Write(Convert.FromBase64String(base64String));
bw.Close();
fs.Close();
return true;
}
//-------------------------------------------------------------------------------
/// <summary>
/// 从网络地址一取得文件并转化为base64编码
/// </summary>
/// <param name="url">文件的url地址,一个绝对的url地址</param>
/// <param name="objWebClient">System.Net.WebClient 对象</param>
/// <returns></returns>
public static string EncodingFileFromUrl(string url, System.Net.WebClient objWebClient)
{
return Convert.ToBase64String(objWebClient.DownloadData(url));
}
/// <summary>
/// 从网络地址一取得文件并转化为base64编码
/// </summary>
/// <param name="url">文件的url地址,一个绝对的url地址</param>
/// <returns>将文件转化后的base64字符串</returns>
public static string EncodingFileFromUrl(string url)
{
//System.Net.WebClient myWebClient = new System.Net.WebClient();
return EncodingFileFromUrl(url, new System.Net.WebClient());
}
}
三、SHA1加密
private string getSHA(string code)
{
if (!String.IsNullOrEmpty(code))
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(code, "SHA1").ToLower();
}
else
{
return string.Empty;
}
}
四、AES加密解密
/// <summary>
/// AES加密解密
/// </summary>
public class AES
{
/// <summary>
/// 获取密钥
/// </summary>
private static string Key
{
get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z‘e9M"; }
}
/// <summary>
/// 获取向量
/// </summary>
private static string IV
{
get { return @"L+/~f4,Ir)b$=pkf"; }
}
/// <summary>
/// AES加密
/// </summary>
/// <param name="plainStr">明文字符串</param>
/// <returns>密文</returns>
public static string AESEncrypt(string plainStr)
{
byte[] bKey = Encoding.UTF8.GetBytes(Key);
byte[] bIV = Encoding.UTF8.GetBytes(IV);
byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);
string encrypt = null;
Rijndael aes = Rijndael.Create();
try
{
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
encrypt = Convert.ToBase64String(mStream.ToArray());
}
}
}
catch { }
aes.Clear();
return encrypt;
}
/// <summary>
/// AES加密
/// </summary>
/// <param name="plainStr">明文字符串</param>
/// <param name="returnNull">加密失败时是否返回 null，false 返回 String.Empty</param>
/// <returns>密文</returns>
public static string AESEncrypt(string plainStr, bool returnNull)
{
string encrypt = AESEncrypt(plainStr);
return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt);
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="encryptStr">密文字符串</param>
/// <returns>明文</returns>
public static string AESDecrypt(string encryptStr)
{
byte[] bKey = Encoding.UTF8.GetBytes(Key);
byte[] bIV = Encoding.UTF8.GetBytes(IV);
byte[] byteArray = Convert.FromBase64String(encryptStr);
string decrypt = null;
Rijndael aes = Rijndael.Create();
try
{
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
decrypt = Encoding.UTF8.GetString(mStream.ToArray());
}
}
}
catch { }
aes.Clear();
return decrypt;
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="encryptStr">密文字符串</param>
/// <param name="returnNull">解密失败时是否返回 null，false 返回 String.Empty</param>
/// <returns>明文</returns>
public static string AESDecrypt(string encryptStr, bool returnNull)
{
string decrypt = AESDecrypt(encryptStr);
return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt);
}
}
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原文地址：http://www.cnblogs.com/ingstyle/p/4076526.html
