AES128的加密解密学习总结

string strcode="我是若见";
byte[] buffer=Encoding.UTF8.GetBytes(strcode);
string msg= Encoding.UTF8.GetString(buffer,0,buffer.Length); //我是若见

Convert.FromBase64String 是 Convert.ToBase64String 的逆过程，
Convert.ToBase64String把byte[]转成base 64字符串，Convert.FromBase64String能把base 64字符串恢复为byte[]

//json 加密的数据，key 密钥，EncryptIV  Iv值
protected  string AESEncrypt(string json, string key,string EncryptIV )
{
byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
byte[] ivArray = UTF8Encoding.UTF8.GetBytes(EncryptIV);
byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(json);
RijndaelManaged rDel = new RijndaelManaged();
rDel.Key = keyArray;
rDel.IV = ivArray;
rDel.Mode = CipherMode.CBC;
rDel.Padding = PaddingMode.Zeros;
//基本的加密转换运算ICryptoTransform 接口 CreateEncryptor,用当前的 Key 属性和初始化向量(IV) 创建对称加密器对象TransformFinalBlock转换指定字节数组的指定区域
//ICryptoTransform 是一个接口。需要此接口才能在任何服务提供程序上调用 CreateEncryptor 方法，服务提供程序将返回定义该接口的实际 encryptor 对象。
ICryptoTransform cTransform = rDel.**CreateEncrypto**r();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
return **Convert.ToBase64String**(resultArray, 0, resultArray.Length);
}
public static string AESDecrypt(string toDecrypt, string key string EncryptIV)
{
byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
byte[] ivArray = UTF8Encoding.UTF8.GetBytes(EncryptIV);
byte[] toEncryptArray = **Convert.FromBase64String**(toDecrypt);
RijndaelManaged rDel = new RijndaelManaged();
rDel.Key = keyArray;
rDel.IV = ivArray;
rDel.Mode = CipherMode.CBC;
rDel.Padding = PaddingMode.Zeros;
CreateDecryptor() //用当前的 Key 属性和初始化向量 (IV) 创建对称解密器对象**
ICryptoTransform cTransform = rDel.**CreateDecryptor**();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
return **UTF8Encoding.UTF8.GetString**(resultArray);
}