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

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

node_modules/jose/lib/jwa/aes_gcm_kw.js

@@ -0,0 +1,24 @@
+const generateIV = require('../help/generate_iv')
+const base64url = require('../help/base64url')
+
+module.exports = (JWA, JWK) => {
+  ['A128GCMKW', 'A192GCMKW', 'A256GCMKW'].forEach((jwaAlg) => {
+    const encAlg = jwaAlg.substr(0, 7)
+    const size = parseInt(jwaAlg.substr(1, 3), 10)
+    const encrypt = JWA.encrypt.get(encAlg)
+    const decrypt = JWA.decrypt.get(encAlg)
+
+    if (encrypt && decrypt) {
+      JWA.keyManagementEncrypt.set(jwaAlg, (key, payload) => {
+        const iv = generateIV(jwaAlg)
+        const { ciphertext, tag } = encrypt(key, payload, { iv })
+        return {
+          wrapped: ciphertext,
+          header: { tag: base64url.encodeBuffer(tag), iv: base64url.encodeBuffer(iv) }
+        }
+      })
+      JWA.keyManagementDecrypt.set(jwaAlg, decrypt)
+      JWK.oct.wrapKey[jwaAlg] = JWK.oct.unwrapKey[jwaAlg] = key => (key.use === 'enc' || key.use === undefined) && key.length === size
+    }
+  })
+}