Decision Workspace
kem vs aws-lc-rs vs p256
Side-by-side comparison of Rust crates
62
kem
growingv0.2.0
Traits for Key Encapsulation Mechanisms (KEMs): public-key cryptosystems designed to enable a sender (a.k.a. encapsulator) to generate and encrypt a short secret key and transmit it to a receiver (a.k.a. decapsulator) confidentially
81
aws-lc-rs
stablev1.16.2
aws-lc-rs is a cryptographic library using AWS-LC for its cryptographic operations. This library strives to be API-compatible with the popular Rust library named ring.
77
p256
growingv0.13.2
Pure Rust implementation of the NIST P-256 (a.k.a. secp256r1, prime256v1) elliptic curve as defined in SP 800-186, with support for ECDH, ECDSA signing/verification, and general purpose curve arithmetic
Core Metrics
| kem | aws-lc-rs | p256 | |
|---|---|---|---|
| Health Score | 62 | 81 | 77 |
| Total Downloads | 860.8K | 92.9M | 98.9M |
| 30d Downloads | 166.6K | 14.3M | 10.2M |
| Dependents | 124 | 1.9K | 5.6K |
| Releases | 22 | 49 | 53 |
| Last Updated | 50d ago | 8d ago | 17d ago |
| Age | 5y 1m | 2y 11m | 7y 5m |
Health Breakdown
kem
Maintenance
15
Quality
9
Community
16
Popularity
7
Documentation
15
aws-lc-rs
Maintenance
21
Quality
20
Community
17
Popularity
8
Documentation
15
p256
Maintenance
18
Quality
16
Community
20
Popularity
8
Documentation
15
Technical Details
| kem | aws-lc-rs | p256 | |
|---|---|---|---|
| Version | 0.2.0 | 1.16.2 | 0.13.2 |
| Stable (≥1.0) | ✗ No | ✓ Yes | ✗ No |
| License | Apache-2.0 OR MIT | ISC AND (Apache-2.0 OR ISC) | Apache-2.0 OR MIT |
| Dependencies | 8 | 9 | 13 |
| Crate Size | 8KB | 225KB | 63KB |
| Features | 2 | 12 | 17 |
| Yanked % | 54.5% | 4.1% | 3.8% |
| Edition | 2021 | 2021 | 2021 |
| MSRV | 1.56 | 1.71.0 | 1.65 |
| Owners | 3 (team) | 4 (team) | 2 (team) |
Links
Quick Verdict
- •aws-lc-rs has the highest health score (81/100) — a strong overall choice.
- •p256 has the most downloads (98.9M), suggesting wider adoption.
- •p256 is depended on by 5.6K crates — strongest ecosystem trust.
- •kem, p256 are pre-1.0 — API may change.