Add Secp256k1Pen.address

packages/sdk/src/pen.spec.ts

@@ -28,7 +28,7 @@ describe("Sec256k1Pen", () => {
     });
   });
 
-  describe("createSignature", () => {
+  describe("sign", () => {
     it("creates correct signatures", async () => {
       const pen = await Secp256k1Pen.fromMnemonic(
         "special sign fit simple patrol salute grocery chicken wheat radar tonight ceiling",
@@ -44,4 +44,13 @@ describe("Sec256k1Pen", () => {
       expect(valid).toEqual(true);
     });
   });
+
+  describe("address", () => {
+    it("creates same address as Go imlementation", async () => {
+      const pen = await Secp256k1Pen.fromMnemonic(
+        "oyster design unusual machine spread century engine gravity focus cave carry slot",
+      );
+      expect(pen.address("cosmos")).toEqual("cosmos1cjsxept9rkggzxztslae9ndgpdyt2408lk850u");
+    });
+  });
 });

packages/sdk/src/pen.ts

@@ -9,6 +9,7 @@ import {
   Slip10RawIndex,
 } from "@iov/crypto";
 
+import { rawSecp256k1PubkeyToAddress } from "./address";
 import { encodeSecp256k1Signature } from "./signature";
 import { StdSignature } from "./types";
 
@@ -84,4 +85,8 @@ export class Secp256k1Pen implements Pen {
     const fixedLengthSignature = new Uint8Array([...signature.r(32), ...signature.s(32)]);
     return encodeSecp256k1Signature(this.pubkey, fixedLengthSignature);
   }
+
+  public address(prefix: string): string {
+    return rawSecp256k1PubkeyToAddress(this.pubkey, prefix);
+  }
 }

packages/sdk/types/pen.d.ts

@@ -29,4 +29,5 @@ export declare class Secp256k1Pen implements Pen {
    * Creates and returns a signature
    */
   sign(signBytes: Uint8Array, prehashType?: PrehashType): Promise<StdSignature>;
+  address(prefix: string): string;
 }