Gen3 pkm Checksum Help

[dani-bit]

I'm working in a save editor for gen3 games and i'm having trouble with the pkm checksums.

I'm using MILOTIC.bin as example/test, it's saved checksum is 0x3408 and the one i calculate is 0x3A02

This is the function I'm using to calculate the checksum:

public function calcDataChecksum():UInt
{
    var sum:UInt = 0x00;
    
    for (i in 0...24)
    {
        var pos = i * 2;
        
        sum += [this.data[pos], this.data[pos+1]].toUInt16();
    }
    
    // truncate to 16-bit
    sum = sum & 0xFFFF;
    
    return sum;
}

And this is how i'm unencrypting the data:

public function decryptData(key:UInt):Array<UInt>
{
    var newData:Array<UInt> = [];
        
    // data offset at 32
    var offset = 32;
        
    var ar = key.fromUInt32();
        
    for (i in 0...48)
    {
        newData.push(this.pkm[offset+i] ^ ar[i%4]);
    }
        
    return newData;
}

Can someone help me find what i'm doing wrong?

Thanks