Add node modules and compiled JavaScript from main (#54)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/jose/lib/jwa/aes_kw.js

@@ -0,0 +1,37 @@
+const { createCipheriv, createDecipheriv, getCiphers } = require('crypto')
+
+const { KEYOBJECT } = require('../help/consts')
+const { asInput } = require('../help/key_object')
+
+const checkInput = (data) => {
+  if (data !== undefined && data.length % 8 !== 0) {
+    throw new Error('invalid data length')
+  }
+}
+
+const wrapKey = (alg, { [KEYOBJECT]: keyObject }, payload) => {
+  const key = asInput(keyObject, false)
+  const cipher = createCipheriv(alg, key, Buffer.alloc(8, 'a6', 'hex'))
+
+  return { wrapped: Buffer.concat([cipher.update(payload), cipher.final()]) }
+}
+
+const unwrapKey = (alg, { [KEYOBJECT]: keyObject }, payload) => {
+  const key = asInput(keyObject, false)
+  checkInput(payload)
+  const cipher = createDecipheriv(alg, key, Buffer.alloc(8, 'a6', 'hex'))
+
+  return Buffer.concat([cipher.update(payload), cipher.final()])
+}
+
+module.exports = (JWA, JWK) => {
+  ['A128KW', 'A192KW', 'A256KW'].forEach((jwaAlg) => {
+    const size = parseInt(jwaAlg.substr(1, 3), 10)
+    const alg = `aes${size}-wrap`
+    if (getCiphers().includes(alg)) {
+      JWA.keyManagementEncrypt.set(jwaAlg, wrapKey.bind(undefined, alg))
+      JWA.keyManagementDecrypt.set(jwaAlg, unwrapKey.bind(undefined, alg))
+      JWK.oct.wrapKey[jwaAlg] = JWK.oct.unwrapKey[jwaAlg] = key => (key.use === 'enc' || key.use === undefined) && key.length === size
+    }
+  })
+}