Sample
rustls 0.23.43: Negotiate in-memory TLS 1.3 sessions between rustls ServerConnection and ClientConnection validating ALPN server preference ordering, disjoint protocol rejection, and Application Data record framing
Verified sample for cargo rustls 0.23.43: Negotiate in-memory TLS 1.3 sessions between rustls ServerConnection and ClientConnection validating ALPN server…
sha256:e33932c47209d54ef12a2a9d82f1c48cbae5f0897576864e98bed8f53a42d264
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MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-17 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
Case
HOW- Goal
- Negotiate in-memory TLS 1.3 sessions between rustls ServerConnection and ClientConnection validating ALPN server preference ordering, disjoint protocol rejection, and Application Data record framing
- Packages
- Symbols
-
- rustls::ServerConfig
- rustls::ServerConnection
- rustls::ClientConfig
- rustls::ClientConnection
- rustls::RootCertStore
- Environment
- rust
- Created
- 2026-08-17T11:36:26Z
Contract
- rustls ServerConnection and ClientConnection resolve ALPN negotiation according to the server's preference order and negotiate in-memory bidirectional TLS 1.3 streams
- rustls selects the server's preferred matching ALPN protocol regardless of client offer order
- rustls fails handshake with NoApplicationProtocol when client and server configure disjoint non-empty ALPN lists
- rustls establishes an in-memory TLS 1.3 session transitioning is_handshaking from true to false
- rustls frames post-handshake application traffic in TLS record type 0x17 with legacy version header 0x0303
- rustls rejects server certificates not anchored in the client's configured RootCertStore
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs