I would like to convert signature in DER-encoded format (which I get from google KMS service) to IEEE 1363 format using C# (in order to validate the signature) How it is done in C#, .Net Core 5 ?
Convert Google KMS signatures from DER-encoded format to .Net IEEE 1363 format
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Since .NET 5, both the ASN.1/DER and the IEEE P1363 formats are supported for ECDSA signatures, see e.g.
SignData()andVerifyData()(similarlySignHash()andVerifyHash()).A specification of the format is possible with
DSASignatureFormatwith the valuesIeeeP1363FixedFieldConcatenation(IEEE P1363) andRfc3279DerSequence(ASN.1/DER). Default is IEEE P1363.For other versions C#/BouncyCastle can be applied.
If you want to convert the signatures directly, the easiest way is to use an ASN.1 parser (e.g. from C#/BouncyCastle).