The slh-dsa-py from mjosaarinen

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Simple Python implementation of SLH-DSA ("Stateless Hash-Based Digital Signature Standard") as described in FIPS 205.

License: MIT License

Makefile 0.01% Roff 95.79% Python 4.20%

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slh-dsa.py key generation issue

Hi,

I was looking at the kat directory, and I'm not sure if key generation is being done correctly?

I have the sphincsplus consistent-based branch installed and I've run PQCgenKAT_sign for sphincs-sha2-128f. I then hashed the resulting PQCsignKAT_64.rsp and verified its value against the value listed for sphincs-sha2-128f-robust at https://github.com/sphincs/sphincsplus/blob/consistent-basew/SHA256SUMS#L13C1-L13C90 and the values match.

Looking closer at PQCsignKAT_64.rsp for sphincs-sha2-128f, the values for count = 0 are (I omitted sm as it was so large):

seed = 061550234D158C5EC95595FE04EF7A25767F2E24CC2BC479D09D86DC9ABCFDE7056A8C266F9EF97ED08541DBD2E1FFA1
mlen = 33
msg = D81C4D8D734FCBFBEADE3D3F8A039FAA2A2C9957E835AD55B22E75BF57BB556AC8
pk = B505D7CFAD1B497499323C8686325E473985E5A31E5B9A0457916C84320C2EA8
sk = 7C9935A0B07694AA0C6D10E4DB6B1ADD2FD81A25CCB148032DCD739936737F2DB505D7CFAD1B497499323C8686325E473985E5A31E5B9A0457916C84320C2EA8
smlen = 17121

The values calculated by your py implementation from https://github.com/mjosaarinen/slh-dsa-py/blob/main/kat/sphincs-sha2-128f-simple.rsp.1 are:

seed = 061550234D158C5EC95595FE04EF7A25767F2E24CC2BC479D09D86DC9ABCFDE7056A8C266F9EF97ED08541DBD2E1FFA1
mlen = 33
msg = D81C4D8D734FCBFBEADE3D3F8A039FAA2A2C9957E835AD55B22E75BF57BB556AC8
pk = B505D7CFAD1B497499323C8686325E47FDF7400AB7A5D8C7ABA7350AC4092ADD
sk = 7C9935A0B07694AA0C6D10E4DB6B1ADD2FD81A25CCB148032DCD739936737F2DB505D7CFAD1B497499323C8686325E47FDF7400AB7A5D8C7ABA7350AC4092ADD
smlen = 17121

Notice that the last 32 characters of pk and sk differ.

Thanks,

Ben

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