test: add HMAC encryption tests

test/crypto/encryption.test.ts

@@ -0,0 +1,62 @@
+import {
+  importHmacKey,
+  exportHmacKey,
+  hkdfHmacKey,
+  validateHmac,
+  generateHmac,
+} from '../../src/crypto/encryption'
+import crypto from '../../src/crypto/crypto'
+
+describe('HMAC encryption', () => {
+  it('generates and validates HMAC', async () => {
+    const secret = crypto.getRandomValues(new Uint8Array(32))
+    const salt = crypto.getRandomValues(new Uint8Array(32))
+    const message = crypto.getRandomValues(new Uint8Array(32))
+    const hmac = await generateHmac(secret, salt, message)
+    const key = await hkdfHmacKey(secret, salt)
+    const valid = await validateHmac(key, hmac, message)
+    expect(valid).toBe(true)
+  })
+
+  it('generates and validates HMAC with imported key', async () => {
+    const secret = crypto.getRandomValues(new Uint8Array(32))
+    const salt = crypto.getRandomValues(new Uint8Array(32))
+    const message = crypto.getRandomValues(new Uint8Array(32))
+    const hmac = await generateHmac(secret, salt, message)
+    const key = await hkdfHmacKey(secret, salt)
+    const exportedKey = await exportHmacKey(key)
+    const importedKey = await importHmacKey(exportedKey)
+    const valid = await validateHmac(importedKey, hmac, message)
+    expect(valid).toBe(true)
+  })
+
+  it('fails to validate HMAC with wrong message', async () => {
+    const secret = crypto.getRandomValues(new Uint8Array(32))
+    const salt = crypto.getRandomValues(new Uint8Array(32))
+    const message = crypto.getRandomValues(new Uint8Array(32))
+    const hmac = await generateHmac(secret, salt, message)
+    const key = await hkdfHmacKey(secret, salt)
+    const valid = await validateHmac(
+      key,
+      hmac,
+      crypto.getRandomValues(new Uint8Array(32))
+    )
+    expect(valid).toBe(false)
+  })
+
+  it('fails to validate HMAC with wrong key', async () => {
+    const secret = crypto.getRandomValues(new Uint8Array(32))
+    const salt = crypto.getRandomValues(new Uint8Array(32))
+    const message = crypto.getRandomValues(new Uint8Array(32))
+    const hmac = await generateHmac(secret, salt, message)
+    const valid = await validateHmac(
+      await hkdfHmacKey(
+        crypto.getRandomValues(new Uint8Array(32)),
+        crypto.getRandomValues(new Uint8Array(32))
+      ),
+      hmac,
+      message
+    )
+    expect(valid).toBe(false)
+  })
+})