Create entries for SLH-DSA public keys

[Wind4Greg]

This PR adds SLH-DSA public keys from FIPS 205.

I tried to do this in the same manner as the ML-DSA keys added in PR #392.

The keys are for the different SLH-DSA variants are enumerated in Table 2 section 11 of FIPS 205 . There are twelve variants:

SLH-DSA-SHA2-128s, SLH-DSA-SHAKE-128s, SLH-DSA-SHA2-128f, SLH-DSA-SHAKE-128f, SLH-DSA-SHA2-192s, SLH-DSA-SHAKE-192s, SLH-DSA-SHA2-192f, SLH-DSA-SHAKE-192f, SLH-DSA-SHA2-256s, SLH-DSA-SHAKE-256s, SLH-DSA-SHA2-256f, SLH-DSA-SHAKE-256f

I picked a contiguous block of what seem to be unassigned codes. BR Greg

[rvagg]

Thanks @Wind4Greg. You'll need to put these entries in order, where they belong in the 0x12xx section. Also note that the ML-DSA ones got added with -pub suffixes, which is the established pattern here—public keys get -pub. It looks like we also have ML-DSA private keys in 0x1313-0x1315, do we need to add them for SLH-DSA too?

[Wind4Greg]

Hi @rvagg thanks for the quick response. I added the "-pub" suffix to all entries, and put them in order based on the code value. Hmm, I see the ML-KEM private keys at 0x1313-0x1315, but not the ML-DSA private keys. I could add them for consistency maybe starting with 0x1240-0x124b.

[rvagg]

No need to add the private keys if you don't need them, they could be added later by someone that has a need for them, or perhaps nobody if they are never needed. There'll be space for them.

[rvagg]

(pushed a newline char at EOF)

[Wind4Greg]

Thanks @rvagg! I'll be back when FALCON gets turned into FIPS-206. These codes are going into the Verifiable Credential cryptosuite for PQC. Cheers Greg