Method checkPrime() is too slow

[zhulduz]

Hi.

I use ssh2 library https://github.com/mscdex/ssh2 in a browser. I have faced up with next problem.

Method checkPrime() at this code

defineError(this, checkPrime(this.__prime, generator));

works very very slowly, so I can't connect to my server. I try to connect by key with a passphrase, 'ctr' ciphers is used.
As I discovered method Red.prototype.pow make such delays.

Thanks a lot.

[calvinmetcalf]

so diffie-hellman arithmetic is pretty slow in general, so if you are able to use elliptical curve diffie hellman to authenticate then that is probably preferable for you.

checkPrime is simply the very first bit of big number math being done, if it can't get through that it probably won't get there the latter stuff.

[zhulduz]

Can you please get additional information about this method?
As I understood, this method checks is number prime or not?

Commented code is always usefull)

[calvinmetcalf]

In previous versions of node it would throw an error if you used an unsafe
prime but in more recent versions it just sets a property so we could
switch that to a lazily calculated getter so we only do the work if we need
to.

On Mon, Oct 26, 2015, 2:14 AM zhulduz notifications@github.com wrote:

I can't understand a meaning of this method. If I set another value (8, 4,
2, "any_string") instead of calling checkPrime(this.__prime, generator)),
the connection to the server is work correctly.

Can you please get additional information about this method?

When code is commented, it is also useful.

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[zhulduz]

Thanks a lot)