test(test/curve25519.js): Add shared key tests

test/curve25519.js

@@ -1,17 +1,40 @@
-const { keyPair } = require('../curve25519')
+const { keyPair, shared } = require('../curve25519')
 const isBuffer = require('is-buffer')
 const test = require('ava')
 
-test('curve25519.keyPair(seed)', async (t) => {
+test('curve25519.keyPair(seed)', (t) => {
  t.throws(() => keyPair(null), TypeError)
  t.throws(() => keyPair(0), TypeError)
  t.throws(() => keyPair(''), TypeError)
  t.throws(() => keyPair(true), TypeError)
  t.throws(() => keyPair([]), TypeError)
+ t.throws(() => keyPair(Buffer.alloc(0)), TypeError)
+ t.throws(() => keyPair(Buffer.alloc(4)), TypeError)
+ t.throws(() => keyPair(Buffer.alloc(64)), TypeError)
+
  t.true('object' === typeof keyPair())
  t.true('object' === typeof keyPair(Buffer.alloc(32).fill('hello')))
  t.true(isBuffer(keyPair().publicKey))
  t.true(isBuffer(keyPair().secretKey))
  t.true(32 === keyPair().publicKey.length)
  t.true(32 === keyPair().secretKey.length)
 })
+
+test('curve25519.shared(secretKey, publicKey)', (t) => {
+ t.throws(() => shared(), TypeError)
+ t.throws(() => shared(0, 0), TypeError)
+ t.throws(() => shared('', ''), TypeError)
+ t.throws(() => shared(null, null), TypeError)
+ t.throws(() => shared(null, Buffer.alloc(32)), TypeError)
+ t.throws(() => shared(Buffer.alloc(32), null), TypeError)
+ t.throws(() => shared(Buffer.alloc(0), Buffer.alloc(0)), RangeError)
+ t.throws(() => shared(Buffer.alloc(32), Buffer.alloc(0)), RangeError)
+ t.throws(() => shared(Buffer.alloc(0), Buffer.alloc(32)), RangeError)
+
+ const alice = keyPair()
+ const bob = keyPair()
+ const key = shared(alice.secretKey, bob.publicKey)
+
+ t.true(isBuffer(key))
+ t.true(32 === key.length)
+})