security: VerifyAuthFrame rejects wrong-length peer public keys (panic-DoS)#40
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…c-DoS) ed25519.Verify panics on a public key that is not exactly PublicKeySize bytes; VerifyAuthFrame received peerEdPubKey from a registry lookup or a caller-supplied HandshakeConfig and passed it straight to Verify. Adds a length guard plus fuzz coverage over the auth-frame and wire request decoders. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Companion to the
crypto.Verifylength guard (v0.5.9).VerifyAuthFramebypassedcrypto.Verifyand calleded25519.Verifydirectly onpeerEdPubKey, which panics on a key that is not exactlyPublicKeySizebytes. That key comes from a registry lookup or caller-suppliedHandshakeConfig, so a malformed record was a remote panic-DoS.Adds the length guard plus fuzz coverage over the auth-frame and wire request decoders.
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