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

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

node_modules/jose/lib/jwa/rsassa_pss.js

@@ -0,0 +1,43 @@
+const {
+  createSign,
+  createVerify,
+  constants
+} = require('crypto')
+
+const { KEYOBJECT } = require('../help/consts')
+const resolveNodeAlg = require('../help/node_alg')
+const { asInput } = require('../help/key_object')
+
+const sign = (nodeAlg, { [KEYOBJECT]: keyObject }, payload) => {
+  const key = asInput(keyObject, false)
+  return createSign(nodeAlg).update(payload).sign({
+    key,
+    padding: constants.RSA_PKCS1_PSS_PADDING,
+    saltLength: constants.RSA_PSS_SALTLEN_DIGEST
+  })
+}
+
+const verify = (nodeAlg, { [KEYOBJECT]: keyObject }, payload, signature) => {
+  const key = asInput(keyObject, true)
+  return createVerify(nodeAlg).update(payload).verify({
+    key,
+    padding: constants.RSA_PKCS1_PSS_PADDING,
+    saltLength: constants.RSA_PSS_SALTLEN_DIGEST
+  }, signature)
+}
+
+const LENGTHS = {
+  PS256: 528,
+  PS384: 784,
+  PS512: 1040
+}
+
+module.exports = (JWA, JWK) => {
+  ['PS256', 'PS384', 'PS512'].forEach((jwaAlg) => {
+    const nodeAlg = resolveNodeAlg(jwaAlg)
+    JWA.sign.set(jwaAlg, sign.bind(undefined, nodeAlg))
+    JWA.verify.set(jwaAlg, verify.bind(undefined, nodeAlg))
+    JWK.RSA.sign[jwaAlg] = key => key.private && JWK.RSA.verify[jwaAlg](key)
+    JWK.RSA.verify[jwaAlg] = key => (key.use === 'sig' || key.use === undefined) && key.length >= LENGTHS[jwaAlg]
+  })
+}