[squeak-dev] DoubleWordArray broken in Pharo

Robert robert.withers at pm.me
Sat Mar 28 14:26:00 UTC 2020

On 3/28/20 10:16 AM, Levente Uzonyi wrote:
> Hi Robert,
> No, it's not a VM bug. My analysis I sent to you earlier is correct. It's
> that in Pharo DoubleWordArray is a variableWordSubclass instead of a
> variableDoubleWordSubclass. The latter is not available in Pharo.
> Here's the link to the issue they created based on my analysis you sent
> to them: https://github.com/pharo-project/pharo/issues/5956

Alright, I shared this analysis with Pharo's Discord channel. I must 
have missed the discussion of the #variableDoubleWordSubclass:.

> In theory, yes, it would be possible to rewrite SHA-512 and its related
> hash functions to avoid using DoubleWordArray, but I see no value in doing
> that.

The value would be Crypto operational in Pharo. And all that follows 
from that (ParrotTalk, SSL, SSH, Signal, Raven). Is it possible for you 
to make these changes, please? I see this as more likely than Pharo 
accommodating #variableDoubleWordSubclass:. And other Smalltalks...

k, r

> Pharo simply failed to properly integrate DoubleWordArray. It's there but
> it's disfunctional. Just wait until they fix it.
> Levente
> P.S.: This is pretty much off topic on squeak-dev.
> On Sat, 28 Mar 2020, Robert wrote:
>> Hey Levente,
>> I dug a little deeper into the Pharo issue with Cryptography and it IS a VM issue, I think. Primitive 61 is failing in DoubleWordArray>>#at:put:. Pharo seems totally uninterested in fixing this so I wanted to ask you, is there any way Cryptography can avoid reliance on DoubleWordArray?
>> Kindly,
>> Robert

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