#crypto #ecies #cryptocurrency #secp256k1 #ecc


Elliptic Curve Integrated Encryption Scheme for secp256k1 in Rust

1 unstable release

0.2.1 Aug 25, 2021

#1886 in Cryptography

21 downloads per month

MIT license

378 lines


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Elliptic Curve Integrated Encryption Scheme for secp256k1 in Rust, based on pure Rust implementation of secp256k1.

ECIES functionalities are built upon AES-GCM-256 and HKDF-SHA256.

This is the Rust version of eciespy.

This library can be compiled to the WASM target at your option, see WASM compatibility.

Quick Start

use ecies::{decrypt, encrypt, utils::generate_keypair};

const MSG: &str = "helloworld";
let (sk, pk) = generate_keypair();
let (sk, pk) = (&sk.serialize(), &pk.serialize());

let msg = MSG.as_bytes();
    decrypt(sk, &encrypt(pk, msg).unwrap()).unwrap().as_slice()

Optional pure Rust AES backend

You can choose to use OpenSSL implementation or pure Rust implementation of AES-256-GCM:

ecies = {version = "0.2", default-features = false, features = ["pure"]}

Due to some performance problem, OpenSSL is the default backend.

Pure Rust implementation is sometimes useful, such as building on WASM:

cargo build --no-default-features --features pure --target=wasm32-unknown-unknown

If you select the pure Rust backend on modern CPUs, consider building with

RUSTFLAGS="-Ctarget-cpu=sandybridge -Ctarget-feature=+aes,+sse2,+sse4.1,+ssse3"

to speed up AES encryption/decryption. This would be no longer necessary when aes-gcm supports automatic CPU detection.

WASM compatibility

It's also possible to build to the wasm32-unknown-unknown target with the pure Rust backend. Check out this repo for more details.


Why AES-GCM-256 and HKDF-SHA256

AEAD scheme like AES-GCM-256 should be your first option for symmetric ciphers, with unique IVs in each encryption.

For key derivation functions on shared points between two asymmetric keys, HKDFs are proven to be more secure than simple hash functions like SHA256.

Cross-language compatibility

All functionalities are mutually checked among different languages: Python, Rust, JavaScript and Golang.

Security audit

Following dependencies are audited:

Release Notes


  • Revamp error handling


  • Revamp documentation
  • Optional pure Rust AES backend
  • WASM compatibility

0.1.1 ~ 0.1.5

  • Bump dependencies
  • Update documentation
  • Fix error handling


  • First beta version release


~100K SLoC