implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/lib0/crypto/ecdsa.js

@@ -0,0 +1,97 @@
+/**
+ * ECDSA is an asymmetric key for signing
+ */
+
+import * as webcrypto from 'lib0/webcrypto'
+export { exportKeyJwk, exportKeyRaw } from './common.js'
+
+/**
+ * @typedef {Array<'sign'|'verify'>} Usages
+ */
+
+/**
+ * @type {Usages}
+ */
+const defaultUsages = ['sign', 'verify']
+
+const defaultSignAlgorithm = {
+  name: 'ECDSA',
+  hash: 'SHA-384'
+}
+
+/**
+ * @experimental The API is not final!
+ *
+ * Sign a message
+ *
+ * @param {CryptoKey} key
+ * @param {Uint8Array<ArrayBuffer>} data
+ * @return {PromiseLike<Uint8Array<ArrayBuffer>>} signature
+ */
+export const sign = (key, data) =>
+  webcrypto.subtle.sign(
+    defaultSignAlgorithm,
+    key,
+    data
+  ).then(signature => new Uint8Array(signature))
+
+/**
+ * @experimental The API is not final!
+ *
+ * Sign a message
+ *
+ * @param {CryptoKey} key
+ * @param {Uint8Array<ArrayBuffer>} signature
+ * @param {Uint8Array<ArrayBuffer>} data
+ * @return {PromiseLike<boolean>} signature
+ */
+export const verify = (key, signature, data) =>
+  webcrypto.subtle.verify(
+    defaultSignAlgorithm,
+    key,
+    signature,
+    data
+  )
+
+const defaultKeyAlgorithm = {
+  name: 'ECDSA',
+  namedCurve: 'P-384'
+}
+
+/* c8 ignore next */
+/**
+ * @param {Object} opts
+ * @param {boolean} [opts.extractable]
+ * @param {Usages} [opts.usages]
+ */
+export const generateKeyPair = ({ extractable = false, usages = defaultUsages } = {}) =>
+  webcrypto.subtle.generateKey(
+    defaultKeyAlgorithm,
+    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 2 */
+    usages = jwk.key_ops || defaultUsages
+  }
+  return webcrypto.subtle.importKey('jwk', jwk, defaultKeyAlgorithm, extractable, /** @type {Usages} */ (usages))
+}
+
+/**
+ * Only suited for importing public keys.
+ *
+ * @param {any} raw
+ * @param {Object} opts
+ * @param {boolean} [opts.extractable]
+ * @param {Usages} [opts.usages]
+ */
+export const importKeyRaw = (raw, { extractable = false, usages = defaultUsages } = {}) =>
+  webcrypto.subtle.importKey('raw', raw, defaultKeyAlgorithm, extractable, usages)