Crypto libraries
OpenSSL
The widely embedded cryptographic library ships all three initial NIST PQC standards and hybrid TLS key exchange in its 3.5 LTS line.
ShippingVerified through 2026-09-06
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Crypto libraries
ShippingOpenSSL 3.5 LTS (April 2025)
- ML-KEM (FIPS 203)
- Implemented
- ML-DSA (FIPS 204)
- Implemented
- SLH-DSA (FIPS 205)
- Implemented
- TLS 1.3 hybrid keyshare
- Default group list includes X25519MLKEM768
COpenSSL 3.5 release announcement and CHANGESChecked 2026-09-06
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1 dated stepsPublished milestones
- 2025-04-08shippedC
OpenSSL 3.5 released
ML-KEM, ML-DSA and SLH-DSA became available in the LTS release; X25519MLKEM768 entered the default TLS group list.
OpenSSL 3.5 final release