docs: updating key docs in concepts section (AztecProtocol#6387)

Fixes AztecProtocol#6358

---------

Co-authored-by: Lasse Herskind <16536249+LHerskind@users.noreply.github.com>

docs/docs/guides/guides/smart_contracts/writing_contracts/how_to_emit_event.md

@@ -19,26 +19,15 @@ Unlike on Ethereum, there are 2 types of events supported by Aztec: [encrypted](
 
 Encrypted events can only be emitted by private functions and are encrypted using a public key of a recipient.
 For this reason it is necessary to register a recipient in the Private Execution Environment (PXE) before encrypting the events for them.
-Recipients can be registered using Aztec.js:
-
-```ts
-const aztecAddress = AztecAddress.fromString(
-  "0x147392a39e593189902458f4303bc6e0a39128c5a1c1612f76527a162d36d529"
-);
-const publicKey = Point.fromString(
-  "0x26e193aef4f83c70651485b5526c6d01a36d763223ab24efd1f9ff91b394ac0c20ad99d0ef669dc0dde8d5f5996c63105de8e15c2c87d8260b9e6f02f72af622"
-);
-const partialAddress = Fr.fromString(
-  "0x200e9a6c2d2e8352012e51c6637659713d336405c29386c7c4ac56779ab54fa7"
-);
-
-const completeAddress = new CompleteAddress(
-  aztecAddress,
-  publicKey,
-  partialKey
-);
-await pxe.registerRecipient(completeAddress);
-```
+
+First we need to get a hold of recipient's [complete address](#complete-address).
+Bellow are some ways how we could instantiate it after getting the information in a string form from a recipient:
+
+#include_code instantiate-complete-address /yarn-project/circuits.js/src/structs/complete_address.test.ts rust
+
+Then to register the recipient's [complete address](/aztec/aztec/concepts/accounts/keys.md#complete-address) in PXE we would call `registerRecipient` PXE endpoint using [Aztec.js](/aztec/aztec/core_components.md#aztecjs):
+
+#include_code register-recipient /yarn-project/aztec.js/src/wallet/create_recipient.ts rust
 
 :::info
 If a note recipient is one of the accounts inside the PXE, we don't need to register it as a recipient because we already have the public key available. You can register a recipient as shown [here](../how_to_deploy_contract.md)

noir-projects/aztec-nr/aztec/src/keys/getters.nr

@@ -14,6 +14,7 @@ use crate::{
 
 global DELAY = 5;
 
+// docs:start:key-getters
 pub fn get_npk_m(context: &mut PrivateContext, address: AztecAddress) -> GrumpkinPoint {
     get_master_key(context, address, NULLIFIER_INDEX)
 }
@@ -34,6 +35,7 @@ pub fn get_ivpk_m(context: &mut PrivateContext, address: AztecAddress) -> Grumpk
 // pub fn get_tpk_m(context: &mut PrivateContext, address: AztecAddress) -> GrumpkinPoint {
 //     get_master_key(context, address, TAGGING_INDEX)
 // }
+// docs:end:key-getters
 
 fn get_master_key(
     context: &mut PrivateContext,

yarn-project/aztec.js/src/wallet/create_recipient.ts

@@ -8,6 +8,8 @@ import { CompleteAddress } from '@aztec/circuits.js';
  */
 export async function createRecipient(pxe: PXE): Promise<CompleteAddress> {
   const completeAddress = CompleteAddress.random();
+  // docs:start:register-recipient
   await pxe.registerRecipient(completeAddress);
+  // docs:end:register-recipient
   return completeAddress;
 }

yarn-project/circuits.js/src/structs/complete_address.test.ts

@@ -33,4 +33,38 @@ describe('CompleteAddress', () => {
     const address = CompleteAddress.fromBuffer(expectedAddress.toBuffer());
     expect(address.equals(expectedAddress)).toBe(true);
   });
+
+  it('instantiates from string and individual components', () => {
+    // docs:start:instantiate-complete-address
+    // Typically a recipient would share their complete address with the sender
+    const completeAddressFromString = CompleteAddress.fromString(
+      '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',
+    );
+
+    // Alternatively, a recipient could share the individual components with the sender
+    const address = Fr.fromString('0x09bc7031bb21627cce6aac1dc710ecc92acd8475149c530a4bb57df63d9d6fe9');
+    const npkM = Point.fromString(
+      '0x02a9372135ce5b49b46102732fabd742c31642543396013dde5b460075864607264c605bc115c6cb92a4db0a6b893fd3777341078693d0af22e3ff53f4c2ee2a',
+    );
+    const ivpkM = Point.fromString(
+      '0x2fae73914fc50d325e2707a8e996f1ad498429f715f998225dc6bd2ede05aaee055ee137d28b634322e0ea98afc42dfc48833e8d2879c34d23d6d1d337069cca',
+    );
+    const ovpkM = Point.fromString(
+      '0x212af0f28b7865b339e202a0077fd3bd8dddc472d055945ad99c02dcccd28bb22bb3585fca3e5751c9913521a390458d63e4d9b292e4872582f3b13da214470c',
+    );
+    const tpkM = Point.fromString(
+      '0x14083a4567cf4f1e92696e6c01923bc6a8b414159446268b12fe8669ce44f1f5196561aca6c654d2405a5653002cba5552b50b6ce1afc9515ed6682507abcb30',
+    );
+
+    const partialAddress = Fr.fromString('0x10040d791aeb30138efc9c7d36b47684af2f26f686672448349f05934ae7bbbf');
+
+    const completeAddressFromComponents = new CompleteAddress(
+      address,
+      new PublicKeys(npkM, ivpkM, ovpkM, tpkM),
+      partialAddress,
+    );
+    // docs:end:instantiate-complete-address
+
+    expect(completeAddressFromComponents.equals(completeAddressFromString)).toBe(true);
+  });
 });

yarn-project/end-to-end/src/e2e_key_registry.test.ts

@@ -159,11 +159,13 @@ describe('Key Registry', () => {
     const secondNewMasterNullifierPublicKey = Point.random();
 
     it('rotates npk_m', async () => {
+      // docs:start:key-rotation
       await keyRegistry
         .withWallet(wallets[0])
         .methods.rotate_npk_m(wallets[0].getAddress(), firstNewMasterNullifierPublicKey, Fr.ZERO)
         .send()
         .wait();
+      // docs:end:key-rotation
 
       // We check if our rotated nullifier key is equal to the key obtained from the getter by reading our registry
       // contract from the test contract. We expect this to fail because the change has not been applied yet

yarn-project/end-to-end/src/flakey_e2e_account_init_fees.test.ts

@@ -1,11 +1,14 @@
 import { getSchnorrAccount } from '@aztec/accounts/schnorr';
 import {
   type AccountManager,
+  type AztecNode,
   type DebugLogger,
+  type DeployL1Contracts,
   ExtendedNote,
   Fr,
   NativeFeePaymentMethod,
   Note,
+  type PXE,
   PrivateFeePaymentMethod,
   PublicFeePaymentMethod,
   Schnorr,
@@ -25,14 +28,7 @@ import {
 
 import { jest } from '@jest/globals';
 
-import {
-  type BalancesFn,
-  type EndToEndContext,
-  expectMapping,
-  getBalancesFn,
-  publicDeployAccounts,
-  setup,
-} from './fixtures/utils.js';
+import { type BalancesFn, expectMapping, getBalancesFn, publicDeployAccounts, setup } from './fixtures/utils.js';
 import { GasPortalTestingHarnessFactory, type IGasBridgingTestHarness } from './shared/gas_portal_test_harness.js';
 
 const TOKEN_NAME = 'BananaCoin';
@@ -43,8 +39,11 @@ const BRIDGED_FPC_GAS = BigInt(10e12);
 jest.setTimeout(1_000_000);
 
 describe('e2e_fees_account_init', () => {
-  let ctx: EndToEndContext;
   let logger: DebugLogger;
+  let aztecNode: AztecNode;
+  let pxe: PXE;
+  let teardown: () => Promise<void>;
+
   let sequencer: Wallet;
   let sequencersAddress: AztecAddress;
   let alice: Wallet;
@@ -84,22 +83,24 @@ describe('e2e_fees_account_init', () => {
   }
 
   beforeAll(async () => {
-    ctx = await setup(2, {}, {}, true);
-    logger = ctx.logger;
-    [sequencer, alice] = ctx.wallets;
+    let wallets: Wallet[];
+    let wallet: Wallet;
+    let deployL1ContractsValues: DeployL1Contracts;
+    ({ logger, wallets, wallet, aztecNode, pxe, deployL1ContractsValues } = await setup(2, {}, {}, true));
+    [sequencer, alice] = wallets;
     sequencersAddress = sequencer.getAddress();
 
-    await ctx.aztecNode.setConfig({
+    await aztecNode.setConfig({
       feeRecipient: sequencersAddress,
     });
 
     gasBridgeTestHarness = await GasPortalTestingHarnessFactory.create({
-      aztecNode: ctx.aztecNode,
-      pxeService: ctx.pxe,
-      publicClient: ctx.deployL1ContractsValues.publicClient,
-      walletClient: ctx.deployL1ContractsValues.walletClient,
-      wallet: ctx.wallet,
-      logger: ctx.logger,
+      aztecNode,
+      pxeService: pxe,
+      publicClient: deployL1ContractsValues.publicClient,
+      walletClient: deployL1ContractsValues.walletClient,
+      wallet,
+      logger,
       mockL1: false,
     });
 
@@ -122,15 +123,15 @@ describe('e2e_fees_account_init', () => {
     gasBalances = getBalancesFn('⛽', gas.methods.balance_of_public, logger);
   });
 
-  afterAll(() => ctx.teardown());
+  afterAll(() => teardown());
 
   beforeEach(() => {
     gasSettings = GasSettings.default();
     maxFee = gasSettings.getFeeLimit().toBigInt();
     actualFee = 1n;
     bobsSecretKey = Fr.random();
     bobsPrivateSigningKey = Fq.random();
-    bobsAccountManager = getSchnorrAccount(ctx.pxe, bobsSecretKey, bobsPrivateSigningKey, Fr.random());
+    bobsAccountManager = getSchnorrAccount(pxe, bobsSecretKey, bobsPrivateSigningKey, Fr.random());
     bobsAddress = bobsAccountManager.getCompleteAddress().address;
   });
 
@@ -292,7 +293,7 @@ describe('e2e_fees_account_init', () => {
         const completeAddress = CompleteAddress.fromSecretKeyAndInstance(bobsSecretKey, instance);
 
         // alice registers the keys in the PXE
-        await ctx.pxe.registerRecipient(completeAddress);
+        await pxe.registerRecipient(completeAddress);
 
         // and deploys bob's account, paying the fee from her balance
         const publicKeysHash = deriveKeys(bobsSecretKey).publicKeys.hash();
@@ -339,6 +340,6 @@ describe('e2e_fees_account_init', () => {
     const note = new Note([new Fr(amount), secretHash]);
     // this note isn't encrypted but we need to provide a registered public key
     const extendedNote = new ExtendedNote(note, owner, bananaCoin.address, storageSlot, noteTypeId, txHash);
-    await ctx.pxe.addNote(extendedNote);
+    await pxe.addNote(extendedNote);
   }
 });