46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
# ristretto255-dh [](https://crates.io/crates/ristretto255-dh) [](https://docs.rs/ristretto255-dh) [](https://github.com/ZcashFoundation/ristretto255-dh/actions?query=workflow%3ACI+branch%3Amain)
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Diffie-Hellman key exchange using the [Ristretto255][ristretto] group,
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in pure Rust.
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This crate provides a high-level API for static and ephemeral
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Diffie-Hellman in the Ristretto255 prime order group, as specified the
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[IETF draft][ietf-draft], implemented internally over Curve25519 using
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[curve25519-dalek].
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## Example
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```rust
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use rand_core::OsRng;
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use ristretto255_dh::EphemeralSecret;
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use ristretto255_dh::PublicKey;
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// Alice's side
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let alice_secret = EphemeralSecret::new(&mut OsRng);
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let alice_public = PublicKey::from(&alice_secret);
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// Bob's side
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let bob_secret = EphemeralSecret::new(&mut OsRng);
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let bob_public = PublicKey::from(&bob_secret);
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// Alice again
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let alice_shared_secret = alice_secret.diffie_hellman(&bob_public);
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// Bob again
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let bob_shared_secret = bob_secret.diffie_hellman(&alice_public);
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// Each peer's computed shared secret should be the same.
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assert_eq!(<[u8; 32]>::from(alice_shared_secret), <[u8; 32]>::from(bob_shared_secret));
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```
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## About
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The high-level Diffie-Hellman API is inspired by [x25519-dalek].
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[curve25519-dalek]: https://github.com/dalek-cryptography/curve25519-dalek
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[ietf-draft]: https://ietf.org/id/draft-irtf-cfrg-ristretto255-00.html
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[ristretto]: https://ristretto.group
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[x25519-dalek]: https://github.com/dalek-cryptography/x25519-dalek
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