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
DSASignatureFormat
with 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).