This patch implements generate key operations of three RSA algorithms
(RSASSA-PKCS1-v1_5, RSA-OAEP, RSA-OAEP), with `rsa` crate.
The three operations are very similar to each other, so we can implement
them as a single function, located at the sub-module `rsa_common`,
shared among the three RSA algorithms. The enum `RsaAlgorithm` is used
differentiate the behavior of a few steps (Step 1, 5, 13 and 18) that
are slightly different among the three RSA algorithms.
Testing: Pass some WPT tests that were expected to fail.
Fixes: Part of #41113
---------
Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>
Co-authored-by: Josh Matthews <josh@joshmatthews.net>
84e8194434