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Add CASE session initiator (Sigma1/Sigma2/Sigma3) #408

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jonlil wants to merge 5 commits into from
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Add CASE session initiator (Sigma1/Sigma2/Sigma3) #408

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3ba3d56
Add CASE session initiator behind case-initiator feature
jonlil Apr 7, 2026
354383c
ci: retrigger
jonlil Apr 11, 2026
cdb75da
Fix CASE initiator: derive IPK operational key from epoch key
jonlil Apr 12, 2026
c7947bb
Make compute_compressed_fabric_id public for CASE initiator use
jonlil Apr 12, 2026
e735fad
Fix import formatting (cargo fmt)
jonlil Apr 12, 2026
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3 changes: 3 additions & 0 deletions rs-matter/Cargo.toml
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Expand Up @@ -14,6 +14,9 @@ rust-version = "1.87"
[features]
default = ["os", "rustcrypto", "log"]

# Optional protocol features
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@ivmarkov ivmarkov Apr 13, 2026

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Are you positive that the LLM is not hallucinating the code/flash size increase? The equivalent PR #410 shows 0% code-size increase even though its code is not hidden behind a feature.

case-initiator = [] # CASE session initiator (client-side Sigma1/Sigma2/Sigma3)

# Sizing

# Number of fabrics
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2 changes: 1 addition & 1 deletion rs-matter/src/fabric.rs
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Expand Up @@ -660,7 +660,7 @@ impl Fabric {
}

/// Compute the compressed fabric ID
pub(crate) fn compute_compressed_fabric_id<C: Crypto>(
pub fn compute_compressed_fabric_id<C: Crypto>(
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@ivmarkov ivmarkov Apr 13, 2026

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Unnecessary if the Fabric type is also used by the initiator.

crypto: C,
root_pubkey: CanonPkcPublicKeyRef<'_>,
fabric_id: u64,
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4 changes: 3 additions & 1 deletion rs-matter/src/sc/case.rs
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Expand Up @@ -30,7 +30,9 @@ use crate::transport::exchange::Exchange;
use crate::transport::session::{NocCatIds, ReservedSession, SessionMode};
use crate::utils::init::{init, Init, InitMaybeUninit};

mod casep;
pub(crate) mod casep;
#[cfg(feature = "case-initiator")]
pub mod initiator;

// Two certificates (NOC and ICAC), plus ECDSA etc -> approx 950b, doing 1024 to be safe
const CASE_LARGE_BUF_SIZE: usize = MAX_CERT_TLV_LEN * 2 + 224;
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