crypto/internal/fips/rsa: support all SHA hashes in PKCS#1 v1.5
The byte sequences match those in
https://github.com/randombit/botan/blob/
e5ec40828/src/lib/pk_pad/hash_id/hash_id.cpp
For #69536
Fixes #43923
Change-Id: I8b4daea71c2f696ad67ddc13affefd1563c51266
Reviewed-on: https://go-review.googlesource.com/c/go/+/630095
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>