implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/lib0/crypto/rsa-oaep.js

@@ -0,0 +1,81 @@
+/**
+ * RSA-OAEP is an asymmetric keypair used for encryption
+ */
+
+import * as webcrypto from 'lib0/webcrypto'
+export { exportKeyJwk } from './common.js'
+
+/**
+ * @typedef {Array<'encrypt'|'decrypt'>} Usages
+ */
+
+/**
+ * @type {Usages}
+ */
+const defaultUsages = ['encrypt', 'decrypt']
+
+/**
+ * Note that the max data size is limited by the size of the RSA key.
+ *
+ * @param {CryptoKey} key
+ * @param {Uint8Array<ArrayBuffer>} data
+ * @return {PromiseLike<Uint8Array<ArrayBuffer>>}
+ */
+export const encrypt = (key, data) =>
+  webcrypto.subtle.encrypt(
+    {
+      name: 'RSA-OAEP'
+    },
+    key,
+    data
+  ).then(buf => new Uint8Array(buf))
+
+/**
+ * @experimental The API is not final!
+ *
+ * Decrypt some data using AES-GCM method.
+ *
+ * @param {CryptoKey} key
+ * @param {Uint8Array<ArrayBuffer>} data
+ * @return {PromiseLike<Uint8Array>} decrypted buffer
+ */
+export const decrypt = (key, data) =>
+  webcrypto.subtle.decrypt(
+    {
+      name: 'RSA-OAEP'
+    },
+    key,
+    data
+  ).then(data => new Uint8Array(data))
+
+/**
+ * @param {Object} opts
+ * @param {boolean} [opts.extractable]
+ * @param {Usages} [opts.usages]
+ * @return {Promise<CryptoKeyPair>}
+ */
+export const generateKeyPair = ({ extractable = false, usages = defaultUsages } = {}) =>
+  webcrypto.subtle.generateKey(
+    {
+      name: 'RSA-OAEP',
+      modulusLength: 4096,
+      publicExponent: new Uint8Array([1, 0, 1]),
+      hash: 'SHA-256'
+    },
+    extractable,
+    usages
+  )
+
+/**
+ * @param {any} jwk
+ * @param {Object} opts
+ * @param {boolean} [opts.extractable]
+ * @param {Usages} [opts.usages]
+ */
+export const importKeyJwk = (jwk, { extractable = false, usages } = {}) => {
+  if (usages == null) {
+    /* c8 ignore next */
+    usages = jwk.key_ops || defaultUsages
+  }
+  return webcrypto.subtle.importKey('jwk', jwk, { name: 'RSA-OAEP', hash: 'SHA-256' }, extractable, /** @type {Usages} */ (usages))
+}