lokey

One brittle, brute force method to do this (RSA-style) a decade ago was LD_PRELOAD vs. the RNG: Phidelius: Constructing Asymmetric Keypairs From Mere Passwords For Fun and PAKE https://dankaminsky.com/2012/01/03/phidelius/ Non-Persistent PGP Keys (2011) https://ritter.vg/blog-non_persistent_pgp.html -- Also related: https://github.com/jpf/lokey, "a tool for converting between cryptographic key formats". Unfortunately it needs maintenance.

I wrote a tool to convert between all of the RSA key formats that I could find: http://github.com/jpf/lokey If you're still curious if the key material is different (I'm very curious), try the following and compare the results: pkcs15-tool --read-ssh-key 1 | lokey to jwk pkcs15-tool --read-ssh-key 1 --rfc4716 | lokey to jwk (You can also replace "jwk" with any of the other supported RSA types. It might be easier to compare the "ssh" type)