[crypto] Outstanding test failures in ECDSA and RSA

[RyanTorok]

Description

Several outstanding test failures exist for RSA and ECDSA in the cryptotest framework.

RSA:

• [ ] wycheproof RSA-2048 pss verify sha-384 #64
• [ ] wycheproof RSA-3072 pss verify sha-256 #94
• [ ] wycheproof RSA-4096 pss verify sha-256 #31
• [ ] wycheproof RSA-4096 pss verify sha-384 #9
• [ ] wycheproof RSA-4096 pss verify sha-384 #33
• [ ] wycheproof RSA-4096 pss verify sha-512 #164
• [ ] NIST CAVP RSA-3072 Verify PSS SHA-{256, 384, 512} unconditionally returns "fail"

ECDSA:

• [x] wycheproof p256 verify sha-256 #350
• [x] wycheproof p256 verify sha-512 #420
• [x] wycheproof p256 verify sha3-256 #358
• [x] wycheproof p256 verify sha3-512 #424

[vsukhoml]

I requested NIST ACVP tests for many of the combinations and got sample test vectors. I can add those in addition to wycheproof if this helps.

[RyanTorok]

ECDSA test failures resolved by #22393

[moidx]

Removing the ROM label as we are no longer using RSA for secure boot.

[johannheyszl]

@andrea-caforio to PTAL

[nasahlpa]

Closing as the ECDSA tests are passing and the remaining failing RSA verify tests are documented in https://github.com/lowRISC/opentitan/issues/28656.