[release-branch.go1.20] crypto/rsa: use BoringCrypto for 4096 bit keys
Updates #58803
Fixes #58927
Change-Id: I097938ff61dae2b65214f8d0126d68de63525f5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/474515
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
(cherry picked from commit
7bc3281747030877e13d218ba12c6e95fcf4e7d4)
Reviewed-on: https://go-review.googlesource.com/c/go/+/495735
Reviewed-by: Heschi Kreinick <heschi@google.com>