crypto_primitives_bench

Cryptographic primitives used by client/wallet code. Measures the per-call cost of key derivation, sender-side DH for note encryption, and Account note symmetric encrypt/decrypt. Standalone host binary, no live stack required.

Machine

Field	Value
Chip	Apple M2 Pro (8P+4E)
RAM	16 GB
OS	macOS 15.5
Rust	1.94.0
Profile	release

Results

Criterion sample_size = 50, warm_up_time = 2 s, measurement_time = 10 s. Slope-regression point estimate in the middle column; 95% confidence interval bounds in the outer columns.

Operation	low	point	high	outliers (mild + severe)
keychain/new_os_random	3.11 ms	3.21 ms	3.34 ms	3 + 5
keychain/new_mnemonic	3.05 ms	3.11 ms	3.23 ms	0 + 2
shared_secret_key/sender_dh	76.7 µs	78.4 µs	80.6 µs	3 + 4
encryption/encrypt	1.11 µs	1.17 µs	1.25 µs	1 + 5
encryption/decrypt	907 ns	928 ns	954 ns	0 + 3

Numbers from a single M2 Pro dev box. For full estimates (slope, mean, median, MAD, std-dev) and the noise model, see target/criterion/<group>/<bench>/estimates.json after running locally.

Findings

Keychain creation is dominated by the 2048-round HMAC-SHA512 PBKDF in the mnemonic-to-SSK path. ≈ 3 ms.
Per-recipient DH (secp256k1) is ≈ 80 µs. Outbound shielded transfers to N recipients cost ≈ 80·N µs of crypto on top of proving.
Symmetric encrypt/decrypt over a 49-byte Account note is sub-µs. Bulk encryption is not the bottleneck.

Reproduce

cargo bench -p crypto_primitives_bench --bench primitives

JSON estimates: target/criterion/<group>/<bench>/estimates.json. HTML report: target/criterion/report/index.html.

Baseline comparison

# On main:
cargo bench -p crypto_primitives_bench --bench primitives -- --save-baseline main
# On your branch:
cargo bench -p crypto_primitives_bench --bench primitives -- --baseline main

Criterion reports per-bench change as a percentage with a 95% confidence interval; deltas within the CI are reported as "no significant change" rather than red.

Caveats

Single-thread, no SIMD acceleration. Bench dev box uses the pure-Rust secp256k1 backend.

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