docs: add metamask verify arbitrary example

coinhall · Jan 4, 2024 · 7eff51e · 7eff51e
1 parent f767aed
commit 7eff51e
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Showing 3 changed files with 35 additions and 2 deletions.
diff --git a/examples/verify-signatures/package.json b/examples/verify-signatures/package.json
@@ -7,6 +7,7 @@
   },
   "dependencies": {
     "@keplr-wallet/cosmos": "^0.11.63",
+    "cosmes": "link:../..",
     "secp256k1": "^5.0.0"
   },
   "devDependencies": {

diff --git a/examples/verify-signatures/pnpm-lock.yaml b/examples/verify-signatures/pnpm-lock.yaml
diff --git a/examples/verify-signatures/src/index.ts b/examples/verify-signatures/src/index.ts
@@ -1,4 +1,5 @@
 import { verifyADR36Amino } from "@keplr-wallet/cosmos";
+import { recoverPubKeyFromEthSignature } from "cosmes/codec";
 import { createHash } from "node:crypto";
 import { ecdsaVerify } from "secp256k1";
 
@@ -38,22 +39,46 @@ function verifyArbitraryStation(
   );
 }
 
+/**
+ * Returns true iff the signature is valid for the given data and public key.
+ * Works for Metamask.
+ */
+function verifyArbitraryMetamask(
+  data: string,
+  pubKey: string,
+  signature: string
+) {
+  const recoveredPubKey = recoverPubKeyFromEthSignature(
+    Buffer.from(data, "utf8"),
+    Buffer.from(signature, "base64")
+  );
+  return pubKey === Buffer.from(recoveredPubKey).toString("base64");
+}
+
 console.log(
   verifyArbitraryKeplr(
     // TODO: fill in chain prefix (eg. "osmo")
     "",
     // TODO: fill in address (eg. "osmo1...")
     "",
     // TODO: change data if necessary
-    "Hi from Coinhall! This is a test message just to prove that the wallet is working.",
+    "Hi from CosmeES! This is a test message just to prove that the wallet is working.",
     // TODO: fill in base64 pubKey
     "",
     // TODO: fill in base64 signature
     ""
   ),
   verifyArbitraryStation(
     // TODO: change data if necessary
-    "Hi from Coinhall! This is a test message just to prove that the wallet is working.",
+    "Hi from CosmeES! This is a test message just to prove that the wallet is working.",
+    // TODO: fill in base64 pubKey
+    "",
+    // TODO: fill in base64 signature
+    ""
+  ),
+  verifyArbitraryMetamask(
+    // TODO: change data if necessary
+    "Hi from CosmeES! This is a test message just to prove that the wallet is working.",
     // TODO: fill in base64 pubKey
     "",
     // TODO: fill in base64 signature