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Post-quantum crypto algorithms - #342
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Extract BC's client-side SNTRUP implementation behind internal adapters and support both RFC 9941 algorithm names. Track published upstream sources with Renovate and verify original and extracted SHA-256 hashes in CI.
Implement RFC 10042 ML-KEM-768/P-256 and ML-KEM-1024/P-384 using the bundled Kotlin ML-KEM implementation and JCA ECDH. Validate fixed-width secrets and peer points, and erase ephemeral secret buffers.
Use installed JCA composite services for ssh-mldsa87-p384, with provider-gated defaults and PEM private-key support. Add Kaitai definitions for SSH point and scalar encodings and independently verify both signature components. Document draft encoding inconsistencies.
Implement mlkem768-sha256 and mlkem1024-sha384 with existing JVM and Android providers, keeping both disabled by default. Encode the 32-byte secret as an SSH string, matching the draft exchange-hash definition and CycloneSSH, and document the draft's conflicting mpint wording. Add independent BC interoperability, authentication and rekey conformance, malformed-ciphertext and cleanup checks.
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Add multiple post-quantum crypto algorithms:
Key Exchange
mlkem768nistp256-sha256(RFC 10042 section 2.3.1)mlkem1024nistp384-sha384(RFC 10042 section 2.3.2)mlkem768-sha256(pure ML-KEM draft) — opt-inmlkem1024-sha384(pure ML-KEM draft) — opt-insntrup761x25519-sha512(RFC 9941)sntrup761x25519-sha512@openssh.com(the interoperable OpenSSH alias from RFC 9941)Host keys
ssh-mldsa87-p384(SSH composite signatures draft) — requires platform support