NXT :: descendant of Bitcoin - Updated Information

[wesleyh]

First one (left) is total crap:

/* v = x - h k  mod q
 * returns v != 0  */
int sign25519(k25519 v, const k25519 h, const priv25519 x, const priv25519 k) {
   uint8_t tmp[65];
   unsigned w, i;
   for (i = 0; i < 32; i++)
      tmp = x;
   for (i = 32; i < 64; i++)
      tmp = 0;
   mula32(tmp, h, k, 32, -1);
   divmod(tmp+32, tmp, 64, order25519, 32);
   for (w = 0, i = 0; i < 32; i++)
      w |= v = tmp;
   return w != 0;
}

Second one is the one we use in Nxt.

/* v = (x - h) s  mod q  */
int sign25519(k25519 v, const k25519 h, const priv25519 x, const spriv25519 s) {
   uint8_t tmp[65];
   unsigned w;
   int i;
   for (i = 0; i < 32; i++)
      v = 0;
   i = mula_small(v, x, 0, h, 32, -1);
   mula_small(v, v, 0, order25519, 32, (15-(int8_t) v[31])/16);
   for (i = 0; i < 64; i++)
      tmp = 0;
   mula32(tmp, v, s, 32, 1);
   divmod(tmp+32, tmp, 64, order25519, 32);
   for (w = 0, i = 0; i < 32; i++)
      w |= v = tmp;
   return w != 0;
}

That's bad.

What about comparing outputs of NRS, ur and some other implementation, like NaCl? If ur and NaCl return the same values and NRS returns different ones then we could assume that ur implementation is correct.

There is also this c# version

https://github.com/hanswolff/curve25519

Can't this ported to java?

That one IS ported from java, and now you want to port it back? ;-)

[BloodyRookie]

That's bad.

What about comparing outputs of NRS, ur and some other implementation, like NaCl? If ur and NaCl return the same values and NRS returns different ones then we could assume that ur implementation is correct.

I don't have linux OS. Someone else must test that.
But I am not sure that NaCl has that kind of signature/verify procedure for curve 25519.

[Eadeqa]

There is also this c# version

https://github.com/hanswolff/curve25519

Can't this ported to java?

R u sure it's bug free?

No, but we can compare the results

[BloodyRookie]

There is also this c# version

https://github.com/hanswolff/curve25519

Can't this ported to java?

That one IS ported from java, and now you want to port it back? ;-)

No sign/verify in that version.

[tman10]

By giving me all your nxt,  I can send you one doge.
Just do you a favor.

The catch is that I own 0 NXT atm. An exchange owns them.

Yea...NxtChg owns some of mine...Anybody seen him?

[bitcoinpaul]

There is also this c# version

https://github.com/hanswolff/curve25519

Can't this ported to java?

R u sure it's bug free?

No, but we can compare the results

We don't search for any version. In fact, we need to know if our (well, dmitry's) java version is working 100% correct.

We have the original c implementation by djb - let some cryptographers (dmitry was no crypto guy!) port it for us!

[klee]

Guys I need asap a plugin (or however it is called) for a site to accept donations in NXT!
If it can't be linked to an actual NXT account, at least some graphics, buttons etc.

Thanks in advance.

[Eadeqa]

We have the original c implementation by djb - let some cryptographers (dmitry was no crypto guy!) port it for us!

The bug was in original c version. The port by dimitry is just fine.

[wesleyh]

Guys I need asap a plugin (or however it is called) for a site to accept donations in NXT!
If it can't be linked to an actual NXT account, at least some graphics, buttons etc.

Thanks in advance.

You can use this as a base: http://nxtra.org/pay-button/

Unfinished since I'm working on a client, which is more important.

Note that you'll have to finish it to either send nxt to a different address every time, or ask the user for their account ID so that you can confirm payment is received. Or if you don't care, you can use it as is...

The QR code is bogus too.

[opticalcarrier]

Sometimes I feel a bit frustrated about the fee-system of Nxt, when I see these kind of blocks passing by:


Fee = 0,0016%


Fee = 33,33%

It's not really fair and the rich are getting even richer this way. I love Nxt, but there are small flaws which needs to be addressed. The critics will talk negative about Nxt because of these kind of issues. 

Maybe a percentage instead of a fixed fee? Curious to hear about the options.

I dont think approaching anything from the "rich getting richer" is a good idea in a 100% POS system.  IMO though fee should be based on transaction byte size.  And even if it were based on scale of larger transactions = larger fee, the 'rich' are more apt to mine those higher fee blocks anyways.  There just doesnt seem to be a way to prevent the 'problem', as it were.  Regardless, 'the critics' wont matter the more and more NXT features are released.

The real concern here is people just giving up forging, or centralizing their forging power into central pools.

[Daedelus]

Am I right in seeing that the fees for the asset exchange get sent to the Genesis account (destroyed)?

[gimre]

That's bad.

What about comparing outputs of NRS, ur and some other implementation, like NaCl? If ur and NaCl return the same values and NRS returns different ones then we could assume that ur implementation is correct.

I don't have linux OS. Someone else must test that.
But I am not sure that NaCl has that kind of signature/verify procedure for curve 25519.

I don't remember seeing sign/verify in nacl.

OT: having short break till Mon, in the meantime you guys can dump nxt price a bit

[Passion_ltc]

Guys I need asap a plugin (or however it is called) for a site to accept donations in NXT!
If it can't be linked to an actual NXT account, at least some graphics, buttons etc.

Thanks in advance.

http://tipNXT.com/

[Coinonaer]

What a heck is going on with BTER and Vircurex? I got 2 NXT deposits sitting in both exchanges since yesterday..
Emailed them but nobody responds..
Anyone else?

At my side its just a Vircurex Problem. They received the Nxt from Bter (Blockchain Explorer I see it) but didn´t deliver it further to my trading account.

[opticalcarrier]

Am I right in seeing that the fees for the asset exchange get sent to the Genesis account (destroyed)?

wow I hope thats not the case....  was hoping for some mega craziness for asset issuing, like there was for around block 22000 for alias release

or it could just be that someone is forging on holms with the genesis acct. LOL

[bitcoinpaul]

We have the original c implementation by djb - let some cryptographers (dmitry was no crypto guy!) port it for us!

The bug was in original c version. The port by dimitry is just fine.

I know one thing: we still need a cryptographer for auditing!

[pinarello]

By giving me all your nxt,  I can send you one doge.
Just do you a favor.

The catch is that I own 0 NXT atm. An exchange owns them.

Yea...NxtChg owns some of mine...Anybody seen him?

better read his posts he warned to get your NXT out of the exchange.

[Come-from-Beyond]

Am I right in seeing that the fees for the asset exchange get sent to the Genesis account (destroyed)?

No

[tman10]

By giving me all your nxt,  I can send you one doge.
Just do you a favor.

The catch is that I own 0 NXT atm. An exchange owns them.

Yea...NxtChg owns some of mine...Anybody seen him?

better read his posts he warned to get your NXT out of the exchange.

Oh I got it out but only half....The other went "poof"

[Eadeqa]

We have the original c implementation by djb - let some cryptographers (dmitry was no crypto guy!) port it for us!

The bug was in original c version. The port by dimitry is just fine.

I know one thing: we still need a cryptographer for auditing!

Yes, after implementing the fix from BloodyRookie.

I think BloodyRookie patch should be implemented