ts-sdk: fix ed25519 private key length to match nacl (MystenLabs#4911)

piersy · Sep 30, 2022 · 755d692 · 755d692
1 parent 30d2fba
commit 755d692
Showing 1 changed file with 8 additions and 2 deletions.
diff --git a/sdk/typescript/src/cryptography/ed25519-keypair.ts b/sdk/typescript/src/cryptography/ed25519-keypair.ts
@@ -119,7 +119,13 @@ export class Ed25519Keypair implements Keypair {
     if (!isValidHardenedPath(path)) {
       throw new Error('Invalid derivation path');
     }
-    const { key } = derivePath(path, mnemonicToSeedHex(mnemonics));
-    return new Ed25519Keypair({ publicKey: getPublicKey(key), secretKey: key });
+    const { key } = derivePath(path, mnemonicToSeedHex(mnemonics));    
+
+    // Ed25519 private key returned here has 32 bytes. NaCl expects 64 bytes where the last 32 bytes are the public key. 
+    let fullPrivateKey = new Uint8Array(64);
+    fullPrivateKey.set(key);
+    fullPrivateKey.set(getPublicKey(key, false), 32);
+
+    return new Ed25519Keypair({ publicKey: getPublicKey(key), secretKey: fullPrivateKey });
   }
 }