Re: [OpenCoin-devel] Fwd: [GSoC-2015] OpenCoin Digital Cash App

[Tom S. <to...@op...>]

Hey Nils,

Firefox, Chrome and IE11+ all have in browser random number generators.

https://developer.mozilla.org/en-US/docs/Web/API/Window/crypto

https://developer.mozilla.org/en-US/docs/Web/API/Crypto

No support in less than IE11, though you could seed a pseudo-random
number generator with a random seed from a server request - I think -
but feels riskier.

Give me a call if you are ever in London

Tom x



On 01/04/15 14:41, Nils Toedtmann wrote:
> Re-reading http://sourceforge.net/p/opencoin/mailman/message/31090382/
> it looks like the issue was not lack of BigInt support (that was an
> issue with WebCrypto, not ASM), but crypto-grade randomness.
>
> That was almost 2 years ago. Has that improved? Or is there some other
> source for quality randomness in modern browsers?
>
> /n
>
>
> On 01.04.2015 14:31, Nils Toedtmann wrote:
>> On 01.04.2015 14:28, Nils Toedtmann wrote:
>>> Hi Tom!
>>>
>>> I vaguely remember - but i might be wrong - that there is an important
>>> crypto primitive missing, and that is blinding/unblinding. And
>>> unfortunatly the API is only exposing crypto primitives, but not the
>>> underlying BigInt library, so you have to do it outside JS - which is
>>                                                  ^^^^^^^^^^^^^
>> Typo. I meant outside ASM
>>
>>> pretty slow.
>>>
>>> I think i even had conversations with the webcrypto gang about this.
>>> Will try to find it when i have more time.
>>>
>>> /n
>>>
>>>
>>> On 01.04.2015 13:15, Tom Salfield wrote:
>>>> Hi Stefan,
>>>>
>>>> On 15/03/15 21:41, Stefan Xenon wrote:
>>>>> A while ago we did some tests and found that native JS may be
>>>>> problematic because it is very slow for some of our crypto operations.
>>>>> We concluded that a native "module" would be a good choice when using
>>>>> Phonegap. This module would be native platform code (e.g. Java for
>>>>> Android) and perform the crypto calculation. Do you have experience in
>>>>> using such?
>>>> Out of interest what were the performance problems in doing this using
>>>> browser crypto? I'd have thought that with faster browsers, and built in
>>>> random number generation this should perform quite well by now. In
>>>> firefox and chrome and probably IE12 there is asm.js support - making
>>>> implementations potentially significantly faster:
>>>>
>>>> https://github.com/vibornoff/asmcrypto.js/tree/master/src
>>>>
>>>> Anyway, just interested to know where the bottleneck would be?
>>>>
>>>> Thanks,
>>>>
>>>> Tom
>>>>
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