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

OpenSSL 3.5 LTS (April 2025)

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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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Published milestones

1 dated steps
  1. 2025-04-08
    shippedC

    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
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