feat: deriveKeyPair to derive a keypair from a private key (#7)

SeverinAlexB · Feb 2, 2024 · ffb5f77 · ffb5f77
1 parent 962be07
commit ffb5f77
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Showing 2 changed files with 23 additions and 3 deletions.
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ln-verifymessagejs",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "description": "Signs/checks message signatures like core-lightning checkmessge or lnd signmessage.",
   "repository": {
     "type": "git",

diff --git a/src/utils.ts b/src/utils.ts
@@ -65,8 +65,19 @@ export interface IKeyPair {
     }
 }
 
-export function generateKeyPair(): IKeyPair {
-    const privKey = secp.utils.randomPrivateKey()
+/**
+ * Derive keypair from a private key.
+ * @param privateKey Hex or Uint8Array
+ * @returns IKeyPair
+ */
+export function deriveKeyPair(privateKey: string | Uint8Array): IKeyPair {
+    let privKey: Uint8Array;
+    if (typeof privateKey === 'string' || privateKey instanceof String) {
+        privKey = hexToBytes(privateKey as string)
+    } else {
+        privKey = privateKey;
+    }
+
     const pubKey = secp.getPublicKey(privKey, true)
     return {
         privateKey: {
@@ -80,6 +91,15 @@ export function generateKeyPair(): IKeyPair {
     }
 }
 
+/**
+ * Generate a new keypair
+ * @returns 
+ */
+export function generateKeyPair(): IKeyPair {
+    const privKey = secp.utils.randomPrivateKey()
+    return deriveKeyPair(privKey)
+}
+
 /**
  * Creates a double sha256
  * @param value