FarmSystem/LSL/includes/Common.lsl

string PSK = "MTcxNjMxODQwNzo1ZTdiMzNjNS0zNmQ4LTQyNjItOGI4My00MDg5MDAxMWMzOGY=";

list g_lDevelopers = ["5556d037-3990-4204-a949-73e56cd3cb06","27a0ae67-30d9-4fbc-b9fb-fd388c98c202"];

integer getIngredientChannel(key kID) {
    integer MSB = (integer)("0x" + llGetSubString(kID,0,4));
    integer LSB = (integer)("0x" + llGetSubString(kID,llStringLength(kID)-4, llStringLength(kID)));

    integer ingredientOffset = 0x9F052124;
    return ingredientOffset + MSB - LSB;
}

list StrideOfList(list src, integer stride, integer start, integer end)
{
    list l = [];
    integer ll = llGetListLength(src);
    if(start < 0)start += ll;
    if(end < 0)end += ll;
    if(end < start) return llList2List(src, start, start);
    while(start <= end)
    {
        l += llList2List(src, start, start);
        start += stride;
    }
    return l;
}

// DON'T CHANGE THE FOLLOWING! (Unless you know what you are doing!)

integer XTEA_DELTA      = 0x9E3779B9; // (sqrt(5) - 1) * 2^31
integer xtea_num_rounds = 6;
list    xtea_key        = [0, 0, 0, 0];

integer hex2int(string hex) {
    if(llGetSubString(hex,0,1) == "0x")
        return (integer)hex;
    if(llGetSubString(hex,0,0) == "x")
        return (integer)("0"+hex);
    return(integer)("0x"+hex);
}

// Convers any string to a 32 char MD5 string and then to a list of
// 4 * 32 bit integers = 128 bit Key. MD5 ensures always a specific
// 128 bit key is generated for any string passed.
list xtea_key_from_string( string str )
{
    str = llMD5String(str,0); // Use Nonce = 0
    return [    hex2int(llGetSubString(  str,  0,  7)),
        hex2int(llGetSubString(  str,  8,  15)),
        hex2int(llGetSubString(  str,  16,  23)),
        hex2int(llGetSubString(  str,  24,  31))];
}

// Encipher two integers and return the result as a 12-byte string
// containing two base64-encoded integers.
string xtea_encipher( integer v0, integer v1 )
{
    integer num_rounds = xtea_num_rounds;
    integer sum = 0;
    do {
        // LSL does not have unsigned integers, so when shifting right we
        // have to mask out sign-extension bits.
        v0  += (((v1 << 4) ^ ((v1 >> 5) & 0x07FFFFFF)) + v1) ^ (sum + llList2Integer(xtea_key, sum & 3));
        sum +=  XTEA_DELTA;
        v1  += (((v0 << 4) ^ ((v0 >> 5) & 0x07FFFFFF)) + v0) ^ (sum + llList2Integer(xtea_key, (sum >> 11) & 3));

    } while( num_rounds = ~-num_rounds );
    //return only first 6 chars to remove "=="'s and compact encrypted text.
    return llGetSubString(llIntegerToBase64(v0),0,5) +
        llGetSubString(llIntegerToBase64(v1),0,5);
}

// Decipher two base64-encoded integers and return the FIRST 30 BITS of
// each as one 10-byte base64-encoded string.
string xtea_decipher( integer v0, integer v1 )
{
    integer num_rounds = xtea_num_rounds;
    integer sum = XTEA_DELTA*xtea_num_rounds;
    do {
        // LSL does not have unsigned integers, so when shifting right we
        // have to mask out sign-extension bits.
        v1  -= (((v0 << 4) ^ ((v0 >> 5) & 0x07FFFFFF)) + v0) ^ (sum + llList2Integer(xtea_key, (sum>>11) & 3));
        sum -= XTEA_DELTA;
        v0  -= (((v1 << 4) ^ ((v1 >> 5) & 0x07FFFFFF)) + v1) ^ (sum + llList2Integer(xtea_key, sum  & 3));
    } while ( num_rounds = ~-num_rounds );

    return llGetSubString(llIntegerToBase64(v0), 0, 4) +
        llGetSubString(llIntegerToBase64(v1), 0, 4);
}

// Encrypt a full string using XTEA.
string xtea_encrypt_string( string str )
{
    // encode string
    str = llStringToBase64(str);
    // remove trailing =s so we can do our own 0 padding
    integer i = llSubStringIndex( str, "=" );
    if ( i != -1 )
        str = llDeleteSubString( str, i, -1 );

    // we don't want to process padding, so get length before adding it
    integer len = llStringLength(str);

    // zero pad
    str += "AAAAAAAAAA=";

    string result;
    i = 0;

    do {
        // encipher 30 (5*6) bits at a time.
        result += xtea_encipher(llBase64ToInteger(llGetSubString(str,   i, i + 4) + "A="), llBase64ToInteger(llGetSubString(str, i+5, i + 9) + "A="));
        i+=10;
    } while ( i < len );

    return result;
}

// Decrypt a full string using XTEA
string xtea_decrypt_string( string str ) {
    integer len = llStringLength(str);
    integer i=0;
    string result;
    //llOwnerSay(str);
    do {
        integer v0;
        integer v1;

        v0 = llBase64ToInteger(llGetSubString(str,   i, i + 5) + "==");
        i+= 6;
        v1 = llBase64ToInteger(llGetSubString(str,   i, i + 5) + "==");
        i+= 6;

        result += xtea_decipher(v0, v1);
    } while ( i < len );

    // Replace multiple trailing zeroes with a single one

    i = llStringLength(result) - 1;
    while ( llGetSubString(result, i - 1, i) == "AA" ){
        result = llDeleteSubString(result, i, i);
        i--;
    }
    i = llStringLength(result) - 1;
    //    while (llGetSubString(result, i, i + 1) == "A" ) {
    //        i--;
    //    }
    result = llGetSubString(result, 0, i+1);
    i = llStringLength(result);
    integer mod = i%4; //Depending on encoded length diffrent appends are needed
    if(mod == 1) result += "A==";
    else if(mod == 2 ) result += "==";
    else if(mod == 3) result += "=";

    return llBase64ToString(result);

}

XteaKey(string pwd)
{
    xtea_key = [0,0,0,0];
    xtea_key = xtea_key_from_string(pwd);
}


PROTECT() {

    if(llListFindList(g_lDevelopers, [(string)llGetOwner()]) == -1) {
        llSay(0, "You were not meant to be able to reset this script. Goodbye");
        llDie();
    }else {
        llSay(0, "Developer detected, proceeding with FTS");
    }
}

string DecipherService(string payload, string ident)
{
    if(llJsonValueType(payload,[ident]) == JSON_INVALID)
    {
        return "";
    }

    return llJsonGetValue(payload, [ident,"protocol"]) + "://" + llJsonGetValue(payload,[ident,"host"]) + ":" + llJsonGetValue(payload,[ident,"port"]);
}
integer global_ingredients;
string SERVER_PSK = "8597f-f19f0eec-cc526aa87-152ac84-326";

string g_sServerID = "";

requestProductForDelivery(string sProduct, string sID) {
    llEmail(g_sServerID+"@lsl.secondlife.com", "RequestProductDelivery", "S;;" + xtea_encrypt_string(llList2Json(JSON_OBJECT, [
        "item", sProduct,
        "id", sID
    ])) + ";;X");
}