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

100 timed iterations per operation, 2 warmup discarded.

Operation	best (µs)	mean (µs)	stdev (µs)
KeyChain::new_os_random	2,979.62 (2.98 ms)	3,138.18 (3.14 ms)	258.59 (0.26 ms)
KeyChain::new_mnemonic	2,979.12 (2.98 ms)	3,012.76 (3.01 ms)	46.09 (0.05 ms)
SharedSecretKey::new (sender DH)	74.17 (0.07 ms)	74.48 (0.07 ms)	0.22 (<0.01 ms)
EncryptionScheme::encrypt	0.88 (<0.01 ms)	0.92 (<0.01 ms)	0.03 (<0.01 ms)
EncryptionScheme::decrypt	0.75 (<0.01 ms)	0.78 (<0.01 ms)	0.04 (<0.01 ms)

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 run --release -p crypto_primitives_bench

JSON output: target/crypto_primitives_bench.json.

Caveats

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

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