check description

+ key-derivation/getPairFromPrivate()
M key-derivation/generateKeypair to use class Key
+ class Key for interop between different zkl modules

key-derivation.js

@@ -0,0 +1,63 @@
+import {
+  generateMnemonic as generateMnemonic_bip39,
+  mnemonicToSeed
+} from "web-bip39";
+import wordlist from "web-bip39/wordlists/english";
+import elliptic from "elliptic";
+import { Key } from "./key";
+
+const MNEMONIC_STRENGTH = 192;
+//const CURVE = "curve25519"
+const CURVE = "secp256k1";
+
+/**
+ * Generates a new key pair from a mnemonic.
+ *
+ * @param {string} mnemonic - The mnemonic to generate the key pair from.
+ * @returns {Promise<{ publicKey: Key; privateKey: Key }>} A promise that resolves to an object containing the public and private keys.
+ */
+export async function generateKeypair(mnemonic) {
+  const seed = (await mnemonicToSeed(mnemonic)).toString("hex");
+
+  const ec = new elliptic.ec(CURVE);
+  const keypair = ec.genKeyPair({
+    entropy: seed.slice(0, 32)
+  });
+
+  return {
+    publicKey: new Key("public", { fromHexString: keypair.getPublic("hex") }),
+    privateKey: new Key("private", {
+      fromHexString: keypair.getPrivate("hex")
+    })
+  };
+}
+
+/**
+ * Generates a new mnemonic.
+ *
+ * @returns {string} The generated mnemonic.
+ */
+export function generateMnemonic() {
+  return generateMnemonic_bip39(wordlist, MNEMONIC_STRENGTH);
+}
+
+/**
+ * Gets a key pair from a private key.
+ *
+ * @param {Key} key - The private key to get the key pair from.
+ * @returns {{ publicKey: Key; privateKey: Key }} An object containing the public and private keys.
+ * @throws {TypeError} If the provided key is not a private key.
+ */
+export function getPairFromPrivate(key) {
+  if (key.keyType != "private")
+    throw new TypeError("Required property 'key' must be a private key");
+  const ec = new elliptic.ec(CURVE);
+  const keypair = ec.keyFromPrivate(key.asHexString);
+
+  return {
+    publicKey: new Key("public", { fromHexString: keypair.getPublic("hex") }),
+    privateKey: new Key("private", {
+      fromHexString: keypair.getPrivate("hex")
+    })
+  };
+}