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

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

node_modules/jose/lib/jwa/ecdh/dir.js

@@ -0,0 +1,31 @@
+const { improvedDH } = require('../../help/runtime_support')
+const { KEYLENGTHS } = require('../../registry')
+const { generateSync } = require('../../jwk/generate')
+
+const derive = require('./derive')
+
+const wrapKey = (key, payload, { enc }) => {
+  const epk = generateSync(key.kty, key.crv)
+
+  const derivedKey = derive(enc, KEYLENGTHS.get(enc), epk, key)
+
+  return {
+    wrapped: derivedKey,
+    header: { epk: { kty: key.kty, crv: key.crv, x: epk.x, y: epk.y } }
+  }
+}
+
+const unwrapKey = (key, payload, header) => {
+  const { enc, epk } = header
+  return derive(enc, KEYLENGTHS.get(enc), key, epk, header)
+}
+
+module.exports = (JWA, JWK) => {
+  JWA.keyManagementEncrypt.set('ECDH-ES', wrapKey)
+  JWA.keyManagementDecrypt.set('ECDH-ES', unwrapKey)
+  JWK.EC.deriveKey['ECDH-ES'] = key => (key.use === 'enc' || key.use === undefined) && key.crv !== 'secp256k1'
+
+  if (improvedDH) {
+    JWK.OKP.deriveKey['ECDH-ES'] = key => (key.use === 'enc' || key.use === undefined) && key.keyObject.asymmetricKeyType.startsWith('x')
+  }
+}