how get key from algorithm AES?

[anhhungan]

I have soft ask key to open, after decompile i see it use algorithm AES (below).

Input data includes the following two strings

string 1: AEJ4J16nY7VAZ42xQl84pw==
String 2: PJwyQs1x2aZL0Xck/Ixre+IOSe+W21JtCgKGDm5IHhE=

Key generation algorithm

public static string smethod_0(string string_0, string string_1)
{
    RijndaelManaged managed = Delegate2049.smethod_0();
    MD5CryptoServiceProvider provider = Delegate2039.smethod_0();
    string str2 = "";
    try
    {
        byte[] buffer2 = new byte[0x20];
        byte[] buffer3 = Delegate2058.smethod_0(provider, Delegate2045.smethod_0(Delegate2048.smethod_0(), string_1));
        Delegate2053.smethod_0(buffer3, 0, buffer2, 0, 0x10);
        Delegate2053.smethod_0(buffer3, 0, buffer2, 15, 0x10);
        Delegate2046.smethod_0(managed, buffer2);
        Delegate2036.smethod_0(managed, CipherMode.ECB);
        ICryptoTransform transform = Delegate2610.smethod_0(managed);
        byte[] buffer = Delegate2045.smethod_0(Delegate2048.smethod_0(), string_0);
        str2 = Delegate1837.smethod_0(Delegate2043.smethod_0(transform, buffer, 0, buffer.Length));
    }
    catch (Exception exception1)
    {
        Delegate2071.smethod_0(exception1);
        Exception exception = exception1;
        GClass20.smethod_2(Delegate53.smethod_0("Ch\x00fa \x00fd AES Encrypt bị lỗi : ", Delegate68.smethod_0(exception)), "Th\x00f4ng b\x00e1o");
        Delegate119.smethod_0();
    }
    return str2;
}

Who can help me crack this key ?

TKs so much!