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

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.
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
> 
>