public void Decode(EncryptedVerifiers verifiers)
{
try
{
BsnkType = parser.CheckHeader();
switch (BsnkType.ObjectIdentifier)
{
case BsnkType.EncryptedIdentityName:
DecodePayload(parser, false);
return;
case BsnkType.EncryptedPseudonymName:
DecodePayload(parser, true);
return;
case BsnkType.SignedEncryptedIdentityName:
if (verifiers?.IdentityVerifier == null)
{
throw new ParsingException("No verifier for identity found");
}
DecodeSigned(false, verifiers.IdentityVerifier);
return;
case BsnkType.SignedEncryptedPseudonymName:
if (verifiers?.PseudonymVerifier == null)
{
throw new ParsingException("No verifier for pseudonym found");
}
DecodeSigned(true, verifiers.PseudonymVerifier);
return;
default:
throw new ParsingException($"Cannot handle type {BsnkType.ObjectIdentifier}");
}
}
catch (IOException e)
{
throw new ParsingException("Could not read ASN1", e);
}
}
private void DecodeSigned(bool isPseudonym, EncryptedVerifier verifier)
{
try
{
var payload = parser.ReadObject <DerSequenceParser>().ToAsn1Object().GetDerEncoded();
var payloadParser = new Asn1Parser(payload);
payloadParser.ReadObject <DerSequenceParser>();
BsnkType = payloadParser.CheckHeader();
switch (BsnkType.ObjectIdentifier)
{
case BsnkType.EncryptedIdentityName:
if (isPseudonym)
{
throw new ParsingException("Encrypted identity inside signed encrypted pseudonym");
}
DecodePayload(payloadParser, false);
break;
case BsnkType.EncryptedPseudonymName:
if (!isPseudonym)
{
throw new ParsingException("Encrypted pseudonym inside signed encrypted identity");
}
DecodePayload(payloadParser, true);
break;
default:
throw new ParsingException($"Cannot handle type {BsnkType}");
}
var signature = DecodeSignature();
verifier.Verify(payload, signature);
}
catch (IOException e)
{
throw new ParsingException("ASN1 decode error", e);
}
}
