NIST Post-Quantum Cryptography Standards (FIPS 203, 204, 205)
FIPS 205 SLH-DSA

NIST Post-Quantum Cryptography Standards (FIPS 203, 204, 205) PQC-4: FIPS 205 SLH-DSA Implementation - Stateless Hash-Based Digital Signature

Implement FIPS 205 SLH-DSA (Stateless Hash-Based Digital Signature Algorithm) based on SPHINCS+ for long-term signatures + use cases requiring cryptographic agility independent of lattice assumptions. Use approved parameter sets covering SLH-DSA-SHA2 + SLH-DSA-SHAKE with small (128s/192s/256s) and fast (128f/192f/256f) variants providing trade-off between signature size and signing speed. Implement key generation + signature generation + signature verification per FIPS 205 Sections 5.1 + 5.2 + 5.3. Apply hash function instantiations per Section 6 (SHA2 + SHAKE). Use SLH-DSA for code signing + firmware signing + long-archived documents requiring 50+ year signature longevity.

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