md5加密

/// <summary>
??? /// MD5加密
??? /// </summary>
??? /// <param name="toCryString">要加密的字符串</param>
??? /// <returns></returns>
??? public static string GetMD5Str(string toCryString)
??? {
??????? MD5CryptoServiceProvider hashmd5;
??????? hashmd5 = new MD5CryptoServiceProvider();
??????? return BitConverter.ToString(hashmd5.ComputeHash(Encoding.Default.GetBytes(toCryString))).Replace("-", "").ToLower();//asp是小寫(xiě),把所有字符變小寫(xiě)
??? }

?

DES加密解密

///
/// DEC 加密過(guò)程
///
public static string Encrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProviderdes = new DESCryptoServiceProvider();　//把字符串放到byte數(shù)組中

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//byte[]　inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密對(duì)象的密鑰和偏移量
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
MemoryStream ms = new MemoryStream();　　 //使得輸入密碼必須輸入英文文本
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}

///
/// DEC 解密過(guò)程
///
public static string Decrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProviderdes = new DESCryptoServiceProvider();

byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密對(duì)象的密鑰和偏移量，此值重要，不能修改
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();　//建立StringBuild對(duì)象，CreateDecrypt使用的是流對(duì)象，必須把解密后的文本變成流對(duì)象

return System.Text.Encoding.Default.GetString(ms.ToArray());
}

其中的sKey非常重要,定義的時(shí)候定義成string然后賦值等于八個(gè)字母或數(shù)字,注意,必須8個(gè)
這個(gè)也很實(shí)用,譬如你想進(jìn)入文章頁(yè)面,傳入的參數(shù)的aid=10000
這時(shí)把10000給加密
然后接受的時(shí)候解密.這樣能有效的防止sql注入攻擊!

轉(zhuǎn)載于:https://www.cnblogs.com/taiyonghai/p/5604022.html

總結(jié)

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