feat: allow to generate a random secp256k1 private key

packages/core/package.json

@@ -43,12 +43,14 @@
     "@desmoslabs/desmjs-types": "workspace:packages/types",
     "cosmjs-types": "0.8.0",
     "cosmos-wallet": "^1.2.0",
+    "elliptic": "^6.5.4",
     "long": "^4.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.23.9",
     "@babel/preset-env": "^7.23.9",
     "@babel/preset-typescript": "^7.23.3",
+    "@types/elliptic": "^6.4.18",
     "@types/jest": "^29.5.10",
     "@types/long": "^4.0.1",
     "@types/node": "^20.8.8",

packages/core/src/signers/privatekey.ts

@@ -11,9 +11,13 @@ import {
   DirectSignResponse,
 } from "@cosmjs/proto-signing";
 import { fromHex } from "@cosmjs/encoding";
+import elliptic from "elliptic";
 import { Observer, ObserverManager } from "../utils";
 import { Signer, SignerStatus, SigningMode } from "./signer";
 
+// eslint-disable-next-line new-cap
+const secp256k1 = new elliptic.ec("secp256k1");
+
 /**
  * Enum that represents the connection status of a PrivateKeyProvider.
  */
@@ -202,6 +206,17 @@ export class PrivateKeySigner extends Signer {
     );
   }
 
+  /**
+   * Build the signer with a randomly generated secp256k1 private key.
+   * @param signingMode - Hex encoded private key, or raw private key bytes.
+   * @param options - Signer options.
+   */
+  static generate(signMode: SigningMode, options?: PrivateKeySignerOptions) {
+    const keyPair = secp256k1.genKeyPair();
+    const privateKey = keyPair.getPrivate("hex");
+    return PrivateKeySigner.fromSecp256k1(privateKey, signMode, options);
+  }
+
   constructor(
     provider: PrivateKeyProvider,
     signingMode: SigningMode,

packages/core/src/signers/privatekey.unit.spec.ts

@@ -104,6 +104,11 @@ describe("PrivateKeySigner", () => {
     expect(signer.status).toBe(SignerStatus.NotConnected);
   });
 
+  it("Generate random private key", async () => {
+    const signer = PrivateKeySigner.generate(SigningMode.DIRECT);
+    await signer.connect();
+  });
+
   it("connect successfully", async () => {
     const signer = new PrivateKeySigner(
       mockSecp256k1KeyProvider(),

yarn.lock

@@ -4928,13 +4928,15 @@ __metadata:
     "@cosmjs/tendermint-rpc": 0.31.3
     "@cosmjs/utils": 0.31.3
     "@desmoslabs/desmjs-types": "workspace:packages/types"
+    "@types/elliptic": ^6.4.18
     "@types/jest": ^29.5.10
     "@types/long": ^4.0.1
     "@types/node": ^20.8.8
     "@types/pino": ^7.0.5
     babel-jest: ^29.7.0
     cosmjs-types: 0.8.0
     cosmos-wallet: ^1.2.0
+    elliptic: ^6.5.4
     jest: ^29.7.0
     long: ^4.0.0
     ts-jest: ^29.1.1
@@ -8833,6 +8835,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/bn.js@npm:*":
+  version: 5.1.5
+  resolution: "@types/bn.js@npm:5.1.5"
+  dependencies:
+    "@types/node": "*"
+  checksum: c87b28c4af74545624f8a3dae5294b16aa190c222626e8d4b2e327b33b1a3f1eeb43e7a24d914a9774bca43d8cd6e1cb0325c1f4b3a244af6693a024e1d918e6
+  languageName: node
+  linkType: hard
+
 "@types/body-parser@npm:*":
   version: 1.19.2
   resolution: "@types/body-parser@npm:1.19.2"
@@ -8880,6 +8891,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/elliptic@npm:^6.4.18":
+  version: 6.4.18
+  resolution: "@types/elliptic@npm:6.4.18"
+  dependencies:
+    "@types/bn.js": "*"
+  checksum: c27613c530fb95441e5e6b456c8c9bc26568ca14c546aae6d7c1d8d46869f79a2272feaef266ac00bdb68b2671e6351ed01b91b82266eac30ca9092720825d16
+  languageName: node
+  linkType: hard
+
 "@types/eslint-scope@npm:^3.7.3":
   version: 3.7.4
   resolution: "@types/eslint-scope@npm:3.7.4"