public override void Decrypt(ref ReadableBuffer messageBuffer, RecordType recordType, TlsVersion tlsVersion)
{
var addInfo = new AdditionalInfo()
{
RecordType = recordType,
TlsVersion = tlsVersion,
SequenceNumber = _sequenceNumber,
PlainTextLength = (ushort)(messageBuffer.Length - sizeof(ulong) - _key.TagSize),
};
messageBuffer.Slice(0, sizeof(ulong)).CopyTo(_key.IV.Slice(4).Span);
var tagSpan = messageBuffer.Slice(messageBuffer.Length - _key.TagSize).ToSpan();
messageBuffer = messageBuffer.Slice(sizeof(ulong), addInfo.PlainTextLength);
_key.Init(KeyMode.Decryption);
_key.AddAdditionalInfo(ref addInfo);
_key.SetTag(tagSpan);
Decrypt(ref messageBuffer);
}
public override void Encrypt(ref WritableBuffer writer, Span <byte> plainText, RecordType recordType, TlsVersion tlsVersion)
{
_key.IV.Span.Slice(4).WriteBigEndian(_sequenceNumber);
_key.Init(KeyMode.Encryption);
var additionalInfo = new AdditionalInfo()
{
SequenceNumber = _sequenceNumber,
RecordType = recordType,
TlsVersion = tlsVersion,
PlainTextLength = (ushort)plainText.Length
};
_key.AddAdditionalInfo(ref additionalInfo);
writer.WriteBigEndian(_sequenceNumber);
writer.Ensure(plainText.Length);
var bytesWritten = _key.Finish(plainText, writer.Buffer.Span);
writer.Advance(bytesWritten);
IncrementSequence();
WriteTag(ref writer);
}
public override void Encrypt(ref WritableBuffer writer, ReadableBuffer plainText, RecordType recordType, TlsVersion tlsVersion)
{
_key.IV.Span.Slice(4).WriteBigEndian(_sequenceNumber);
_key.Init(KeyMode.Encryption);
var additionalInfo = new AdditionalInfo()
{
SequenceNumber = _sequenceNumber,
RecordType = recordType,
TlsVersion = tlsVersion,
PlainTextLength = (ushort)plainText.Length
};
_key.AddAdditionalInfo(ref additionalInfo);
writer.WriteBigEndian(_sequenceNumber);
var totalBytes = plainText.Length;
foreach (var b in plainText)
{
if (b.Length == 0)
{
continue;
}
totalBytes -= b.Length;
writer.Ensure(b.Length);
int bytesWritten;
if (totalBytes == 0)
{
bytesWritten = _key.Finish(b.Span, writer.Buffer.Span);
writer.Advance(bytesWritten);
break;
}
bytesWritten = _key.Update(b.Span, writer.Buffer.Span);
writer.Advance(bytesWritten);
}
IncrementSequence();
WriteTag(ref writer);
}
