Elliptic Curve Integrated Encryption Scheme for secp256k1/curve25519 in TypeScript.
This is the JavaScript/TypeScript version of eciespy with a built-in class-like secp256k1/curve25519 API, you may go there for detailed documentation and learn the mechanism under the hood.
npm install eciesjsWe recommend using the latest Node runtime although it's still possible to install on old versions (but at least node 16).
import { PrivateKey, decrypt, encrypt } from "eciesjs";
const sk = new PrivateKey()
const data = Buffer.from("hello world🌍")
const decrypted = decrypt(sk.secret, encrypt(sk.publicKey.toHex(), data))
console.log(Buffer.from(decrypted).toString())Run the example code above:
$ pnpm build && cd example && pnpm install && node index.js
hello world🌍See Configuration to control with more granularity.
This library is browser-friendly, check the example/browser directory for details. Currently it's necessary to polyfill some node modules (like node:crypto, Buffer). From v0.5.0, it can run in browsers without polyfill.
If you want a WASM version to run directly in modern browsers or on some blockchains, check ecies-wasm.
Parameters:
- receiverRawPK - Receiver's public key, hex string or Uint8Array
- msg - Data to encrypt
Returns: Buffer
Parameters:
- receiverRawSK - Receiver's private key, hex string or Uint8Array
- msg - Data to decrypt
Returns: Buffer
- Methods
static fromHex(hex: string): PrivateKey;
constructor(secret?: Uint8Array);
toHex(): string;
encapsulate(pk: PublicKey): Uint8Array;
multiply(pk: PublicKey, compressed?: boolean): Uint8Array;
equals(other: PrivateKey): boolean;- Properties
get secret(): Buffer;
readonly publicKey: PublicKey;
private readonly data;- Methods
static fromHex(hex: string): PublicKey;
constructor(data: Uint8Array);
toHex(compressed?: boolean): string;
decapsulate(sk: PrivateKey): Uint8Array;
equals(other: PublicKey): boolean;- Properties
get uncompressed(): Buffer;
get compressed(): Buffer;
private readonly data;Following configurations are available.
- Elliptic curve: secp256k1 or curve25519 (x25519/ed25519)
- Ephemeral key format in the payload: compressed or uncompressed (only for secp256k1)
- Shared elliptic curve key format in the key derivation: compressed or uncompressed (only for secp256k1)
- Symmetric cipher algorithm: AES-256-GCM or XChaCha20-Poly1305
- Symmetric nonce length: 12 or 16 bytes (only for AES-256-GCM)
For compatibility, make sure different applications share the same configuration.
export type EllipticCurve = "secp256k1" | "x25519" | "ed25519";
export type SymmetricAlgorithm = "aes-256-gcm" | "xchacha20";
export type NonceLength = 12 | 16;
class Config {
ellipticCurve: EllipticCurve = "secp256k1";
isEphemeralKeyCompressed: boolean = false;
isHkdfKeyCompressed: boolean = false;
symmetricAlgorithm: SymmetricAlgorithm = "aes-256-gcm";
symmetricNonceLength: NonceLength = 16;
}
export const ECIES_CONFIG = new Config();On ellipticCurve = "x25519" or ellipticCurve = "ed25519", x25519 (key exchange function on curve25519) or ed25519 (signature algorithm on curve25519) will be used for key exchange instead of secp256k1.
In this case, the payload would always be: 32 Bytes + Ciphered regardless of isEphemeralKeyCompressed.
If you don't know how to choose between x25519 and ed25519, just use the dedicated key exchange function x25519 for efficiency.
On isEphemeralKeyCompressed = true, the payload would be: 33 Bytes + Ciphered instead of 65 Bytes + Ciphered.
On isHkdfKeyCompressed = true, the hkdf key would be derived from ephemeral public key (compressed) + shared public key (compressed) instead of ephemeral public key (uncompressed) + shared public key (uncompressed).
On symmetricAlgorithm = "xchacha20", plaintext data would be encrypted with XChaCha20-Poly1305.
On symmetricNonceLength = 12, the nonce of AES-256-GCM would be 12 bytes. XChaCha20-Poly1305's nonce is always 24 bytes regardless of symmetricNonceLength.
Following dependencies are audited:
See CHANGELOG.md.