Implement Badge Actions > Airdrop by Key

utils/hash.ts

@@ -2,7 +2,24 @@
 
 import { Word32Array } from 'jscrypto'
 import { SHA256 } from 'jscrypto/SHA256'
+import * as secp256k1 from 'secp256k1'
 
 export function sha256(data: Buffer): Buffer {
   return Buffer.from(SHA256.hash(new Word32Array(data)).toUint8Array())
 }
+
+export function generateSignature(id: number, owner: string, privateKey: string) {
+  try {
+    const message = `claim badge ${id} for user ${owner}`
+
+    const privKey = Buffer.from(privateKey, 'hex')
+    // const pubKey = Buffer.from(secp256k1.publicKeyCreate(privKey, true))
+    const msgBytes = Buffer.from(message, 'utf8')
+    const msgHashBytes = sha256(msgBytes)
+    const signedMessage = secp256k1.ecdsaSign(msgHashBytes, privKey)
+    return Buffer.from(signedMessage.signature).toString('hex')
+  } catch (e) {
+    console.log(e)
+    return ''
+  }
+}