Set key length in example issuer to value length (#14869)

Author: austinh0

src/controller/ExampleOperationalCredentialsIssuer.cpp

@@ -56,9 +56,11 @@ CHIP_ERROR ExampleOperationalCredentialsIssuer::Initialize(PersistentStorageDele
 
     PERSISTENT_KEY_OP(mIndex, kOperationalCredentialsIssuerKeypairStorage, key,
                       err = storage.SyncGetKeyValue(key, &serializedKey, keySize));
+    serializedKey.SetLength(keySize);
 
     if (err != CHIP_NO_ERROR)
     {
+        ChipLogProgress(Controller, "Couldn't get %s from storage: %s", kOperationalCredentialsIssuerKeypairStorage, ErrorStr(err));
         // Storage doesn't have an existing keypair. Let's create one and add it to the storage.
         ReturnErrorOnFailure(mIssuer.Initialize());
         ReturnErrorOnFailure(mIssuer.Serialize(serializedKey));
@@ -78,9 +80,12 @@ CHIP_ERROR ExampleOperationalCredentialsIssuer::Initialize(PersistentStorageDele
 
     PERSISTENT_KEY_OP(mIndex, kOperationalCredentialsIntermediateIssuerKeypairStorage, key,
                       err = storage.SyncGetKeyValue(key, &serializedKey, keySize));
+    serializedKey.SetLength(keySize);
 
     if (err != CHIP_NO_ERROR)
     {
+        ChipLogProgress(Controller, "Couldn't get %s from storage: %s", kOperationalCredentialsIntermediateIssuerKeypairStorage,
+                        ErrorStr(err));
         // Storage doesn't have an existing keypair. Let's create one and add it to the storage.
         ReturnErrorOnFailure(mIntermediateIssuer.Initialize());
         ReturnErrorOnFailure(mIntermediateIssuer.Serialize(serializedKey));