AES-GMAC (rfc9044) support for CMS AuthenticatedData

[lbenthins]

Hello,

we are using asn1cryto to implement CMS (PKCS#7) AuthenticatedData. We have noticed that asn1crypto only supports HMAC ASN.1 OIDs. We are planning to use HMAC, but we want also to provide alternatives for systems where block-cipher based MACs are supported only.

In this context, AES-GMAC seems to be a good alternative. AES-GMAC is defined in https://www.rfc-editor.org/rfc/rfc9044.html and has the ASN.1 OID: 2.16.840.1.101.3.4.1.9.

Is there any plan to add support for AES-GMAC in https://github.com/wbond/asn1crypto/blob/master/asn1crypto/algos.py?

Thanks and best regards
Luis