带IV向量的AES加密解密方法

//加密

public static string Encrypt(string str, string key,string IV)
        {
            Byte[] keyArray = System.Text.Encoding.UTF8.GetBytes(key);
            Byte[] toEncryptArray = System.Text.Encoding.UTF8.GetBytes(str);
            var rijndael = new System.Security.Cryptography.RijndaelManaged();
            rijndael.Key = keyArray;
            rijndael.Mode = System.Security.Cryptography.CipherMode.CBC;
            rijndael.Padding = System.Security.Cryptography.PaddingMode.Zeros;
            rijndael.IV = System.Text.Encoding.UTF8.GetBytes(IV);
            System.Security.Cryptography.ICryptoTransform cTransform = rijndael.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
//解密

public static string Decrypt(string str, string key,string IV)
        {
            Byte[] keyArray = System.Text.Encoding.UTF8.GetBytes(key);
            Byte[] toEncryptArray = Convert.FromBase64String(str);
            var rijndael = new System.Security.Cryptography.RijndaelManaged();
            rijndael.Key = keyArray;
            rijndael.Mode = System.Security.Cryptography.CipherMode.CBC;
            rijndael.Padding = System.Security.Cryptography.PaddingMode.Zeros;
            rijndael.IV = System.Text.Encoding.UTF8.GetBytes(IV);
            System.Security.Cryptography.ICryptoTransform cTransform = rijndael.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return System.Text.Encoding.UTF8.GetString(resultArray);
        }

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