first pass at stretchKey

test/ephemeral-keys.spec.js

@@ -7,11 +7,15 @@ const crypto = require('../src')
 
 describe('generateEphemeralKeyPair', () => {
   it('returns a function that generates a shared secret', () => {
-    const maker = crypto.generateEphemeralKeyPair('P-256')
+    const res = crypto.generateEphemeralKeyPair('P-256')
     const ourPublic = '044374add0df35706db7dade25f3959fc051d2ef5166f8a6a0aa632d0ab41cdb4d30e1a064e121ac56155235a6b8d4c5d8fe35e019f507f4e2ff1445e229d7af43'
 
     expect(
-      maker(ourPublic)
+      res.genSharedKey(ourPublic)
     ).to.have.length(32)
+
+    expect(
+      res.key
+    ).to.exist
   })
 })

test/key-stretcher.spec.js

@@ -0,0 +1,25 @@
+/* eslint-env mocha */
+'use strict'
+
+const expect = require('chai').expect
+
+const crypto = require('../src')
+
+describe('keyStretcher', () => {
+  describe('generate', () => {
+    const ciphers = ['AES-128', 'AES-256', 'Blowfish']
+    const hashes = ['SHA1', 'SHA256'/*, 'SHA512'*/]
+    const res = crypto.generateEphemeralKeyPair('P-256')
+    const secret = res.genSharedKey(res.key)
+
+    ciphers.forEach((cipher) => {
+      hashes.forEach((hash) => {
+        it(`${cipher} - ${hash}`, () => {
+          const keys = crypto.keyStretcher(cipher, hash, secret)
+          expect(keys.k1).to.exist
+          expect(keys.k2).to.exist
+        })
+      })
+    })
+  })
+})