Arcanum Asymmetric Cryptography

Asymmetric (public-key) cryptography algorithms for encryption, key exchange, and key agreement.

RSA

RSA encryption and signatures with modern padding schemes:

• RSA-OAEP: Optimal Asymmetric Encryption Padding
• RSA-PSS: Probabilistic Signature Scheme
• RSA-PKCS#1: Legacy padding (use OAEP/PSS for new applications)

ECIES

Elliptic Curve Integrated Encryption Scheme:

• ECIES-P256: Using NIST P-256 curve
• ECIES-P384: Using NIST P-384 curve
• ECIES-secp256k1: Using Bitcoin's curve

Key Exchange

• X25519: Curve25519 Diffie-Hellman (recommended)
• X448: Curve448 Diffie-Hellman (higher security)
• ECDH: Elliptic Curve Diffie-Hellman (P-256, P-384, secp256k1)

Example

use arcanum_asymmetric::prelude::*;

// X25519 key exchange
let alice_secret = X25519SecretKey::generate();
let alice_public = alice_secret.public_key();

let bob_secret = X25519SecretKey::generate();
let bob_public = bob_secret.public_key();

let alice_shared = alice_secret.diffie_hellman(&bob_public);
let bob_shared = bob_secret.diffie_hellman(&alice_public);
assert_eq!(alice_shared.as_bytes(), bob_shared.as_bytes());

// RSA encryption
let (private_key, public_key) = RsaKeyPair::generate(2048)?;
let ciphertext = public_key.encrypt_oaep(b"secret message")?;
let plaintext = private_key.decrypt_oaep(&ciphertext)?;