check description

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

key.js

@@ -0,0 +1,62 @@
+/**
+ * Represents a cryptographic key.
+ */
+export class Key {
+  #key = new Uint8Array(1);
+
+  /**
+   * Creates a new Key instance.
+   *
+   * @param {string} type - The type of key, either "public" or "private".
+   * @param {Object} details - Details about the key.
+   * @param {Uint8Array} [details.fromByteArray] - The key as a byte array.
+   * @param {string} [details.fromHexString] - The key as a hexadecimal string.
+   * @throws {TypeError} If the type is not "public" or "private", or if details are provided but do not contain a valid key representation.
+   */
+  constructor(type, details) {
+    if (type.toLowerCase() !== "public" && type.toLowerCase() !== "private")
+      throw new TypeError(
+        "Required property 'type' may only take 'public' or 'private' as values"
+      );
+    else this.keyType = type;
+
+    if (!details || (!details.fromByteArray && !details.fromHexString))
+      throw new TypeError(
+        "Missing required property 'fromByteArray' or 'fromHexString' in parameter 'details'"
+      );
+
+    if (details.fromByteArray && details.fromHexString)
+      console.warn(
+        "Both 'fromByteArray' and 'fromHexString' present. Value of 'fromHexString' will be used."
+      );
+
+    if (details.fromByteArray) {
+      this.#key = details.fromByteArray;
+    } else if (details.fromHexString) {
+      this.#key = Uint8Array.from(
+        details.fromHexString.match(/.{1,2}/g).map((byte) => parseInt(byte, 16))
+      );
+    }
+  }
+
+  /**
+   * Gets the key as a hexadecimal string.
+   *
+   * @returns {string} The key as a hexadecimal string.
+   */
+  get asHexString() {
+    return this.#key.reduce(
+      (str, byte) => str + byte.toString(16).padStart(2, "0"),
+      ""
+    );
+  }
+
+  /**
+   * Gets the key as a byte array.
+   *
+   * @returns {Uint8Array} The key as a byte array.
+   */
+  get asByteArray() {
+    return this.#key;
+  }
+}