Error trying to "sign" (using the example snippet) about cryptography HOT 4 CLOSED

Which snippet are you referring to?

from cryptography.

Which snippet are you referring to?

I tried the snippet in the main README of the "kms" project (2. "use") here:
https://pub.dev/packages/kms
More specifically this was the snippet I used, just to test a signature of a 3-bytes sequence, with Ed22519:

// ...
final kms = flutterKms();
final document = await kms.collection('examples').createKeyPair(
    keyExchangeType: null, // no key exchange.
    signatureType: SignatureType.ed25519,
);
final pk = await document.getPublicKey();
print("Public key: ${pk.bytes}");
// Sign a document
final signature = await document.sign([1,2,3]);

In the call to the sign method I had the error, as I wrote, because in defaultSignatureImplementations (I think it's from the "cryptography" lib) there's a null in the list (don't know why - this is out of my control) and no null-check while using list items with the "singleWhere" statement here:

from cryptography.

I have the same issue. Has there been any workaround to this?

from cryptography.

The kms package is deprecated for now.

from cryptography.