internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out CadesIssuerSerial decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
AsnValueReader collectionReader;
ReadOnlySpan <byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan <byte> tmpSpan;
// Decode SEQUENCE OF for Issuer
{
collectionReader = sequenceReader.ReadSequence();
var tmpList = new List <GeneralNameAsn>();
GeneralNameAsn tmpItem;
while (collectionReader.HasData)
{
GeneralNameAsn.Decode(ref collectionReader, rebind, out tmpItem);
tmpList.Add(tmpItem);
}
decoded.Issuer = tmpList.ToArray();
}
tmpSpan = sequenceReader.ReadIntegerBytes();
decoded.SerialNumber = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
sequenceReader.ThrowIfNotEmpty();
}
private static string FindAltNameMatch(byte[] extensionBytes, GeneralNameType matchType, string otherOid)
{
// If Other, have OID, else, no OID.
Debug.Assert(
(otherOid == null) == (matchType != GeneralNameType.OtherName),
$"otherOid has incorrect nullarity for matchType {matchType}");
Debug.Assert(
matchType == GeneralNameType.UniformResourceIdentifier ||
matchType == GeneralNameType.DnsName ||
matchType == GeneralNameType.Email ||
matchType == GeneralNameType.OtherName,
$"matchType ({matchType}) is not currently supported");
Debug.Assert(
otherOid == null || otherOid == Oids.UserPrincipalName,
$"otherOid ({otherOid}) is not supported");
AsnReader reader = new AsnReader(extensionBytes, AsnEncodingRules.DER);
AsnReader sequenceReader = reader.ReadSequence();
reader.ThrowIfNotEmpty();
while (sequenceReader.HasData)
{
GeneralNameAsn.Decode(sequenceReader, out GeneralNameAsn generalName);
switch (matchType)
{
case GeneralNameType.OtherName:
// If the OtherName OID didn't match, move to the next entry.
if (generalName.OtherName.HasValue && generalName.OtherName.Value.TypeId == otherOid)
{
// Currently only UPN is supported, which is a UTF8 string per
// https://msdn.microsoft.com/en-us/library/ff842518.aspx
AsnReader nameReader = new AsnReader(generalName.OtherName.Value.Value, AsnEncodingRules.DER);
string udnName = nameReader.ReadCharacterString(UniversalTagNumber.UTF8String);
nameReader.ThrowIfNotEmpty();
return(udnName);
}
break;
case GeneralNameType.Rfc822Name:
if (generalName.Rfc822Name != null)
{
return(generalName.Rfc822Name);
}
break;
case GeneralNameType.DnsName:
if (generalName.DnsName != null)
{
return(generalName.DnsName);
}
break;
case GeneralNameType.UniformResourceIdentifier:
if (generalName.Uri != null)
{
return(generalName.Uri);
}
break;
}
}
return(null);
}
private static byte[] Encode(
Oid policyId,
Oid hashAlgorithmId,
ReadOnlyMemory <byte> messageHash,
ReadOnlyMemory <byte> serialNumber,
DateTimeOffset timestamp,
bool isOrdering,
long?accuracyInMicroseconds,
ReadOnlyMemory <byte>?nonce,
ReadOnlyMemory <byte>?tsaName,
X509ExtensionCollection?extensions)
{
if (policyId == null)
{
throw new ArgumentNullException(nameof(policyId));
}
if (hashAlgorithmId == null)
{
throw new ArgumentNullException(nameof(hashAlgorithmId));
}
var tstInfo = new Rfc3161TstInfo
{
// The only legal value as of 2017.
Version = 1,
Policy = policyId,
MessageImprint =
{
HashAlgorithm =
{
Algorithm = hashAlgorithmId,
Parameters = AlgorithmIdentifierAsn.ExplicitDerNull,
},
HashedMessage = messageHash,
},
SerialNumber = serialNumber,
GenTime = timestamp,
Ordering = isOrdering,
Nonce = nonce,
};
if (accuracyInMicroseconds != null)
{
tstInfo.Accuracy = new Rfc3161Accuracy(accuracyInMicroseconds.Value);
}
if (tsaName != null)
{
tstInfo.Tsa = GeneralNameAsn.Decode(tsaName.Value, AsnEncodingRules.DER);
}
if (extensions != null)
{
tstInfo.Extensions = extensions.OfType <X509Extension>().
Select(ex => new X509ExtensionAsn(ex)).ToArray();
}
using (AsnWriter writer = new AsnWriter(AsnEncodingRules.DER))
{
tstInfo.Encode(writer);
return(writer.Encode());
}
}
private string FormatSubjectAlternativeName(byte[] rawData)
{
// Because SubjectAlternativeName is a commonly parsed structure, we'll
// specifically format this one. And we'll match the OpenSSL format, which
// includes not localizing any of the values (or respecting the multiLine boolean)
//
// The intent here is to be functionally equivalent to OpenSSL GENERAL_NAME_print.
try
{
StringBuilder output = new StringBuilder();
AsnReader reader = new AsnReader(rawData, AsnEncodingRules.DER);
AsnReader collectionReader = reader.ReadSequence();
reader.ThrowIfNotEmpty();
while (collectionReader.HasData)
{
GeneralNameAsn.Decode(collectionReader, out GeneralNameAsn generalName);
if (output.Length != 0)
{
output.Append(", ");
}
if (generalName.OtherName.HasValue)
{
output.Append("othername:<unsupported>");
}
else if (generalName.Rfc822Name != null)
{
output.Append("email:");
output.Append(generalName.Rfc822Name);
}
else if (generalName.DnsName != null)
{
output.Append("DNS:");
output.Append(generalName.DnsName);
}
else if (generalName.X400Address != null)
{
output.Append("X400Name:<unsupported>");
}
else if (generalName.DirectoryName != null)
{
// OpenSSL supports printing one of these, but the logic lives in X509Certificates,
// and it isn't very common. So we'll skip this one until someone asks for it.
output.Append("DirName:<unsupported>");
}
else if (generalName.EdiPartyName != null)
{
output.Append("EdiPartyName:<unsupported>");
}
else if (generalName.Uri != null)
{
output.Append("URI:");
output.Append(generalName.Uri);
}
else if (generalName.IPAddress.HasValue)
{
ReadOnlySpan <byte> ipAddressBytes = generalName.IPAddress.Value.Span;
output.Append("IP Address");
if (ipAddressBytes.Length == 4)
{
// Add the colon and dotted-decimal representation of IPv4.
output.Append(
$":{ipAddressBytes[0]}.{ipAddressBytes[1]}.{ipAddressBytes[2]}.{ipAddressBytes[3]}");
}
else if (ipAddressBytes.Length == 16)
{
// Print the IP Address value as colon separated UInt16 hex values without leading zeroes.
// 20 01 0D B8 AC 10 FE 01 00 00 00 00 00 00 00 00
//
// IP Address:2001:DB8:AC10:FE01:0:0:0:0
for (int i = 0; i < ipAddressBytes.Length; i += 2)
{
output.Append($":{ipAddressBytes[i] << 8 | ipAddressBytes[i + 1]:X}");
}
}
else
{
output.Append(":<invalid>");
}
}
else if (generalName.RegisteredId != null)
{
output.Append("Registered ID:");
output.Append(generalName.RegisteredId);
}
else
{
// A new extension to GeneralName could legitimately hit this,
// but it's correct to say that until we know what that is that
// the pretty-print has failed, and we should fall back to hex.
//
// But it could also simply be poorly encoded user data.
return(null);
}
}
return(output.ToString());
}
catch (CryptographicException)
{
return(null);
}
}
internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out Rfc3161TstInfo decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
AsnValueReader explicitReader;
AsnValueReader defaultReader;
AsnValueReader collectionReader;
ReadOnlySpan <byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan <byte> tmpSpan;
if (!sequenceReader.TryReadInt32(out decoded.Version))
{
sequenceReader.ThrowIfNotEmpty();
}
decoded.Policy = sequenceReader.ReadObjectIdentifier();
MessageImprint.Decode(ref sequenceReader, rebind, out decoded.MessageImprint);
tmpSpan = sequenceReader.ReadIntegerBytes();
decoded.SerialNumber = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
decoded.GenTime = sequenceReader.ReadGeneralizedTime();
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.Sequence))
{
Rfc3161Accuracy tmpAccuracy;
Rfc3161Accuracy.Decode(ref sequenceReader, rebind, out tmpAccuracy);
decoded.Accuracy = tmpAccuracy;
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.Boolean))
{
decoded.Ordering = sequenceReader.ReadBoolean();
}
else
{
defaultReader = new AsnValueReader(DefaultOrdering, AsnEncodingRules.DER);
decoded.Ordering = defaultReader.ReadBoolean();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.Integer))
{
tmpSpan = sequenceReader.ReadIntegerBytes();
decoded.Nonce = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 0)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
GeneralNameAsn tmpTsa;
GeneralNameAsn.Decode(ref explicitReader, rebind, out tmpTsa);
decoded.Tsa = tmpTsa;
explicitReader.ThrowIfNotEmpty();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 1)))
{
// Decode SEQUENCE OF for Extensions
{
collectionReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 1));
var tmpList = new List <X509ExtensionAsn>();
X509ExtensionAsn tmpItem;
while (collectionReader.HasData)
{
X509ExtensionAsn.Decode(ref collectionReader, rebind, out tmpItem);
tmpList.Add(tmpItem);
}
decoded.Extensions = tmpList.ToArray();
}
}
sequenceReader.ThrowIfNotEmpty();
}