C#和javascript可以通用的教加密解密函数
用C＃实现的DES加密与解密：
protected void Page_Load(object sender, EventArgs e)
{
string data = "testdes"; //要加密的数据
byte[] _data = System.Text.Encoding.Unicode.GetBytes(data);
string keyStr = "1234"; //密钥
string ivStr = "abcd"; //初始化向量
byte[] key = System.Text.Encoding.Unicode.GetBytes(keyStr);
byte[] iv = System.Text.Encoding.Unicode.GetBytes(ivStr);
string encData = Encrypt(data, key, iv);
string decData = Decrypt(encData, key, iv);
Response.Write("原数据：" + data + "<br />";
Response.Write("加密后的数据：" + encData + "<br />";
Response.Write("解密后的数据：" + decData + "<br />";
}
//加密算法
private static string Encrypt(string data, byte[] key, byte[] iv)
{
//if (null == key || null == iv)
// InitKeyAndIV();
byte[] _data = System.Text.Encoding.Unicode.GetBytes(data);
MemoryStream ms = new MemoryStream();
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.Key = key;
des.IV = iv;
//生成加密器实例
ICryptoTransform trans = des.CreateEncryptor();
CryptoStream cs = new CryptoStream(ms, trans, CryptoStreamMode.Write);
//加密数据，并将数据写入流
cs.Write(_data, 0, _data.Length);
cs.FlushFinalBlock();
string result = Convert.ToBase64String(ms.ToArray());
ms.Close();
cs.Close();
return result;
}
//解密
private static string Decrypt(string data, byte[] key, byte[] iv)
{
byte[] _data = Convert.FromBase64String(data);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Write);
cs.Write(_data, 0, _data.Length);
cs.FlushFinalBlock();
string result = System.Text.Encoding.Unicode.GetString(ms.ToArray());
ms.Close();
cs.Close();
return result;
}