feat: generate random keypair with constructor (#17448)

web3.js/src/keypair.ts

@@ -1,5 +1,4 @@
 import * as nacl from 'tweetnacl';
-import type {SignKeyPair} from 'tweetnacl';
 
 import {PublicKey} from './publickey';
 
@@ -11,18 +10,33 @@ export interface Signer {
   secretKey: Uint8Array;
 }
 
+/**
+ * Ed25519 Keypair
+ */
+export interface Ed25519Keypair {
+  publicKey: Uint8Array;
+  secretKey: Uint8Array;
+}
+
 /**
  * An account keypair used for signing transactions.
  */
 export class Keypair {
+  private _keypair: Ed25519Keypair;
+
   /**
-   * @internal
-   *
-   * Create a new keypair instance from a {@link SignKeyPair}.
+   * Create a new keypair instance.
+   * Generate random keypair if no {@link Ed25519Keypair} is provided.
    *
    * @param keypair ed25519 keypair
    */
-  constructor(private keypair: SignKeyPair) {}
+  constructor(keypair?: Ed25519Keypair) {
+    if (keypair) {
+      this._keypair = keypair;
+    } else {
+      this._keypair = nacl.sign.keyPair();
+    }
+  }
 
   /**
    * Generate a new random keypair
@@ -72,13 +86,13 @@ export class Keypair {
    * The public key for this keypair
    */
   get publicKey(): PublicKey {
-    return new PublicKey(this.keypair.publicKey);
+    return new PublicKey(this._keypair.publicKey);
   }
 
   /**
    * The raw secret key for this keypair
    */
   get secretKey(): Uint8Array {
-    return this.keypair.secretKey;
+    return this._keypair.secretKey;
   }
 }

web3.js/test/keypair.test.ts

@@ -4,6 +4,12 @@ import {Buffer} from 'buffer';
 import {Keypair} from '../src';
 
 describe('Keypair', () => {
+  it('new keypair', () => {
+    const keypair = new Keypair();
+    expect(keypair.secretKey).to.have.length(64);
+    expect(keypair.publicKey.toBytes()).to.have.length(32);
+  });
+
   it('generate new keypair', () => {
     const keypair = Keypair.generate();
     expect(keypair.secretKey).to.have.length(64);