session-desktop/ts/receiver/keypairs.ts

import { KeyPair } from '../../libtextsecure/libsignal-protocol';
import { fromHexToArray, toHex } from '../session/utils/String';

export type HexKeyPair = {
  publicHex: string;
  privateHex: string;
};

export class ECKeyPair {
  public readonly publicKeyData: Uint8Array;
  public readonly privateKeyData: Uint8Array;

  constructor(publicKeyData: Uint8Array, privateKeyData: Uint8Array) {
    this.publicKeyData = publicKeyData;
    this.privateKeyData = privateKeyData;
  }

  public static fromArrayBuffer(pub: ArrayBuffer, priv: ArrayBuffer) {
    return new ECKeyPair(new Uint8Array(pub), new Uint8Array(priv));
  }

  public static fromKeyPair(pair: KeyPair) {
    return new ECKeyPair(
      new Uint8Array(pair.pubKey),
      new Uint8Array(pair.privKey)
    );
  }

  public static fromHexKeyPair(pair: HexKeyPair) {
    return new ECKeyPair(
      fromHexToArray(pair.publicHex),
      fromHexToArray(pair.privateHex)
    );
  }

  public toString() {
    const hexKeypair = this.toHexKeyPair();
    return `ECKeyPair: ${hexKeypair.publicHex} ${hexKeypair.privateHex}`;
  }

  public toHexKeyPair(): HexKeyPair {
    const publicHex = toHex(this.publicKeyData);
    const privateHex = toHex(this.privateKeyData);
    return {
      publicHex,
      privateHex,
    };
  }
}