no-alloc

[pinkforest]

For no-alloc RSA use-case would need gating for alloc here which can be default-on.

I see some Vec that could be generalized around heapless::Vec with N max.

I can take a stab at it.

[fjarri]

Yes, the only thing using allocations seems to be the vector of residues in Sieve, which has a known maximum length, if you can spare 64kb of stack.