it works

yarn-project/end-to-end/src/e2e_encryption.test.ts

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+import { type Wallet } from '@aztec/aztec.js';
+import { Aes128 } from '@aztec/circuits.js/barretenberg';
+import { TestContract } from '@aztec/noir-contracts.js';
+
+import { randomBytes } from 'crypto';
+
+import { setup } from './fixtures/utils.js';
+
+describe('e2e_encryption', () => {
+  const aes128 = new Aes128();
+
+  let wallet: Wallet;
+  let teardown: () => Promise<void>;
+
+  let contract: TestContract;
+
+  beforeAll(async () => {
+    ({ teardown, wallet } = await setup());
+    contract = await TestContract.deploy(wallet).send().deployed();
+  }, 25_000);
+
+  afterAll(() => teardown());
+
+  it('encrypts', async () => {
+    const input = randomBytes(64);
+    const iv = randomBytes(16);
+    const key = randomBytes(16);
+
+    const expectedCiphertext = aes128.encryptBufferCBC(input, iv, key);
+
+    const logs = await contract.methods
+      .encrypt(Array.from(input), Array.from(iv), Array.from(key))
+      .send()
+      .getUnencryptedLogs();
+    // Each byte of encrypted data is in its own field and it's all serialized into a long buffer so we simply extract
+    // each 32nd byte from the buffer to get the encrypted data
+    const recoveredCiphertext = logs.logs[0].log.data.filter((_, i) => (i + 1) % 32 === 0);
+
+    expect(recoveredCiphertext).toEqual(expectedCiphertext);
+  });
+});