Simple XOR EncDec

using Posix;

//valac --pkg=posix xor.vala

static uint key = 123;


char[] string_to_char_array(string str) {
    char[] char_array = new char[str.length];

    for (int i = 0; i < str.length; i++){
        char_array[i] = (char)str.get_char(str.index_of_nth_char(i));
    }

    return char_array;
}


public static string XOR_EncryptDecrypt(string str)
{
char[] f = string_to_char_array(str);
for (int i = 0; i < f.length; i++)
{
f[i] = (char)((uint)f[i] ^ key);
}
string result = (string)f;
return result;
}

void main()
{

string to_enc = "a";

string enc = XOR_EncryptDecrypt(to_enc);

print("%s", enc);
system("echo "+enc+" > aaa.txt"); //just to throw it into an archive

}