[Cryptography Team] Re: [squeak-dev]
DigitalSignatureAlgorithm>>#initRandomNonInteractively is not random
asqueaker at gmail.com
Thu Aug 26 23:02:13 UTC 2010
DigitalSignatureAlgorithm, SecureHashAlgorithm and
ThirtyTwoBitRegister have been part of Squeak for a long time, there
are legacy users, although I think they should migrate to using the
counterparts in Cryptography.
Folding Cryptography into Squeak would probably go against the
political momentum toward smaller, more modular images. We don't need
to do something that drastic just to solve this issue.
I suggest instead that we merely move two utility methods from Cryptography:
RandomGenerator class>>unpredictableStringsDo: aBlock
to Random class in Squeak, and then employ them in
DigitalSignatureAlgorithm for its #initRandomNonInteractively.
#generateKey should be patched up from its dependence on Cryptography
This allows Squeak to purge the insecure approach of grabbing bits
from a (silent or disconnected) SoundService, in favor of the robust
one in Cryptography (except now moved to Squeak).
On Mon, Aug 23, 2010 at 10:09 AM, Rob Withers <reefedjib at gmail.com> wrote:
> Hi Chris,
> It works really well. The only issue now is the DigitalSignatureAlgorithm
> is located in the core squeak image and the changes I made are in the
> Cryptography package. It would be nice to fold Cryptography into the core
> squeak image, or pull DigitalSignatureAlgorithm out into Cryptography.
> From: "Chris Muller" <asqueaker at gmail.com>
> Sent: Sunday, August 22, 2010 5:35 PM
> To: "The general-purpose Squeak developers list"
> <squeak-dev at lists.squeakfoundation.org>
> Cc: "Squeak Crypto" <cryptography at lists.squeakfoundation.org>
> Subject: [Cryptography Team] Re: [squeak-dev]
> DigitalSignatureAlgorithm>>#initRandomNonInteractively is not random
>> Good, SecureRandom employs its #generateKey method (on the class side)
>> to initialize its 'picker' (class-instance var). This was intended to
>> serve as a globally usable SecureRandom so that clients like
>> DigitalSignatureAlgorithm would not have to define their own.
>> On Sat, Aug 21, 2010 at 5:30 AM, Rob Withers <reefedjib at gmail.com> wrote:
>>> I found a problem with
>>> DigitalSignatureAlgorithm>>#initRandomNonInteractively. It is grabbing
>>> randomBits from the SoundSystem, but I may not have that installed. It
>>> me the same bits repeatedly. I modified
>>> DigitalSignatureAlgorithm>>#initRandomNonInteractively to not rely on the
>>> SoundSystem and instead use SecureRandom. This is published in the
>>> Cryptography repository.
>> Cryptography mailing list
>> Cryptography at lists.squeakfoundation.org
> Cryptography mailing list
> Cryptography at lists.squeakfoundation.org
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