verifiablecredentials-crypto-sdk-typescript-keys/lib/ec/EcPrivateKey.ts

Package for managing keys in the DID space.

/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import EcPublicKey from './EcPublicKey';
import PrivateKey from '../PrivateKey';
import PublicKey from '../PublicKey';
import base64url from 'base64url';
const clone = require('clone');

/**
 * Represents an Elliptic Curve private key
 * @class
 * @extends PrivateKey
 */
export default class EcPrivateKey extends EcPublicKey implements PrivateKey {
  /**
   * ECDSA w/ secp256k1 Curve
   */
  readonly alg: string = 'ES256K';

  /**
   * Private exponent
   */
  public d: string;

  /**
   * Create instance of @class EcPrivateKey
   */
  constructor (key: any) {
    super(key);
    this.d = typeof key.d === 'string' ?  key.d : base64url.encode(key.d);
  }

  /**
   * Gets the corresponding public key
   * @returns The corresponding {@link PublicKey}
   */
  public getPublicKey (): PublicKey {
    const publicKey = clone(this);
    delete publicKey.d;
    return publicKey;
  }
}