Lucas Berger
04d7c23e94
- 5 tests covering roundtrip, IV uniqueness, tamper detection, payload shape - Dynamic import with env key set in beforeAll for module-level KEY eval - RED gate: all fail (src/broker/crypto.ts does not exist yet)
81 lines
3.1 KiB
TypeScript
81 lines
3.1 KiB
TypeScript
/**
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* Broker: AES-GCM app-password encryption
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*
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* Tests the encryptPassword / decryptPassword helpers in src/broker/crypto.ts.
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* Key behaviors verified (T-03-01, T-03-03):
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* - Lossless roundtrip
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* - Unique IVs per encryption (never reuse IV)
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* - GCM auth tag tamper detection
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* - Stored payload shape
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*/
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import { describe, it, expect, beforeAll } from 'vitest'
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// Set a fixed 32-byte (64-char hex) key before importing the module
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const TEST_KEY = 'a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2'
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beforeAll(() => {
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process.env.APP_PASSWORD_ENCRYPTION_KEY = TEST_KEY
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})
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// Dynamic import so env is set before module-level KEY evaluation
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async function getCrypto() {
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return import('../../src/broker/crypto.js')
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}
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describe('encryptPassword / decryptPassword', () => {
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it('roundtrip: decrypt(encrypt(plaintext)) === plaintext', async () => {
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const { encryptPassword, decryptPassword } = await getCrypto()
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const plaintext = 'my-fastmail-app-password-abc123'
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const encrypted = encryptPassword(plaintext)
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expect(decryptPassword(encrypted)).toBe(plaintext)
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})
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it('different IVs produce different ciphertext for the same plaintext', async () => {
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const { encryptPassword } = await getCrypto()
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const plaintext = 'same-password'
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const enc1 = encryptPassword(plaintext)
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const enc2 = encryptPassword(plaintext)
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// The JSON payloads must differ (different IVs → different ciphertext)
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expect(enc1).not.toBe(enc2)
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// And the IVs themselves must differ
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const p1 = JSON.parse(enc1)
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const p2 = JSON.parse(enc2)
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expect(p1.iv).not.toBe(p2.iv)
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})
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it('decrypting with a tampered authTag throws', async () => {
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const { encryptPassword, decryptPassword } = await getCrypto()
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const encrypted = encryptPassword('secret')
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const payload = JSON.parse(encrypted)
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// Flip first byte of authTag
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payload.authTag = ('ff' + payload.authTag.slice(2))
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expect(() => decryptPassword(JSON.stringify(payload))).toThrow()
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})
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it('decrypting with a tampered ciphertext throws', async () => {
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const { encryptPassword, decryptPassword } = await getCrypto()
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const encrypted = encryptPassword('secret')
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const payload = JSON.parse(encrypted)
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// Flip first byte of ciphertext
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payload.ciphertext = ('ff' + payload.ciphertext.slice(2))
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expect(() => decryptPassword(JSON.stringify(payload))).toThrow()
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})
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it('stored payload is valid JSON with iv, authTag, ciphertext fields', async () => {
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const { encryptPassword } = await getCrypto()
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const encrypted = encryptPassword('test-password')
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const payload = JSON.parse(encrypted)
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expect(payload).toHaveProperty('iv')
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expect(payload).toHaveProperty('authTag')
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expect(payload).toHaveProperty('ciphertext')
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// All values are non-empty hex strings
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expect(typeof payload.iv).toBe('string')
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expect(payload.iv.length).toBeGreaterThan(0)
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expect(typeof payload.authTag).toBe('string')
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expect(payload.authTag.length).toBeGreaterThan(0)
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expect(typeof payload.ciphertext).toBe('string')
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expect(payload.ciphertext.length).toBeGreaterThan(0)
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})
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})
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