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Support for CVC concatenated signatures

Pierrick VANDENBROUCKE requested to merge github/fork/rvillido/cvc-signatures into develop

Created by: rvillido

This change adds support to CVC concatenated signatures (in addition to ASN.1 encoded signatures).

Because CVC does not follow a structure like ASN.1, then I couldn't find a way to determine if a signature is definitely CVC or not. CVC signature bytes are simply concatenated. It is possible to check if the signature is ASN.1 encoded.

The fix origins from https://esig-dss.atlassian.net/browse/DSS-801

Estonian Mobile ID ECDSA signatures are encoded in CVC.

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