Add examples

examples/pwd-wraps-ecdh.test.ts

@@ -0,0 +1,19 @@
+import {expect} from 'bun:test'
+
+import {hkdf, pbkdf, Usage} from '../src/kdf'
+import {PrivateWrap, SecretWrap} from '../index'
+
+const salt = new Uint8Array(32)
+const pwd = "test"
+const keypair = await PrivateWrap.gen_keypair()
+
+const kd = await pbkdf(salt, pwd)
+const k = await hkdf(kd, Usage.wrap) as CryptoKey
+
+const cipher = await SecretWrap.encrypt(keypair.privateKey, k)
+const box = cipher.toString()
+const unbox = SecretWrap.fromString(box)
+const plain = await unbox.decrypt(k)
+
+expect(plain).toEqual(keypair.privateKey)
+console.log("pwd-wraps-ecdh OK")