internal static void Decode(AsnReader reader, Asn1Tag expectedTag, out EncryptedContentInfoAsn decoded)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = default;
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
decoded.ContentType = sequenceReader.ReadObjectIdentifierAsString();
System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(sequenceReader, out decoded.ContentEncryptionAlgorithm);
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 0)))
{
if (sequenceReader.TryReadPrimitiveOctetStringBytes(new Asn1Tag(TagClass.ContextSpecific, 0), out ReadOnlyMemory <byte> tmpEncryptedContent))
{
decoded.EncryptedContent = tmpEncryptedContent;
}
else
{
decoded.EncryptedContent = sequenceReader.ReadOctetString(new Asn1Tag(TagClass.ContextSpecific, 0));
}
}
sequenceReader.ThrowIfNotEmpty();
}
internal static void Decode(AsnReader reader, out EncryptedContentInfoAsn decoded)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
Decode(reader, Asn1Tag.Sequence, out decoded);
}
private static void DecodeCore(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out EncryptedContentInfoAsn decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
ReadOnlySpan <byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan <byte> tmpSpan;
decoded.ContentType = sequenceReader.ReadObjectIdentifier();
System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref sequenceReader, rebind, out decoded.ContentEncryptionAlgorithm);
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 0)))
{
if (sequenceReader.TryReadPrimitiveOctetString(out tmpSpan, new Asn1Tag(TagClass.ContextSpecific, 0)))
{
decoded.EncryptedContent = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.EncryptedContent = sequenceReader.ReadOctetString(new Asn1Tag(TagClass.ContextSpecific, 0));
}
}
sequenceReader.ThrowIfNotEmpty();
}
internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out EncryptedContentInfoAsn decoded)
{
try
{
DecodeCore(ref reader, expectedTag, rebind, out decoded);
}
catch (AsnContentException e)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding, e);
}
}
internal static void Decode(ref AsnValueReader reader, ReadOnlyMemory <byte> rebind, out EncryptedContentInfoAsn decoded)
{
Decode(ref reader, Asn1Tag.Sequence, rebind, out decoded);
}