public async Task WriteRead2ByteNumber(ushort value)
{
using MemoryStream ms = new MemoryStream();
using BinaryDataStream stream = new BinaryDataStream(ms);
await stream.Write2BitNumber(value);
await stream.FlushAsync();
stream.Position = 0;
ushort readedValue = await stream.Read2BitNumber();
Assert.AreEqual(value, readedValue);
}
public static async Task <ContainerHeader> ReadFromStream(Stream stream)
{
using (BinaryDataStream dataStream = new BinaryDataStream(stream, false))
{
await CheckPrefix(dataStream);
ContainerHeader header = new ContainerHeader();
header.Version = await dataStream.Read2BitNumber();
if (header.Version != DefaultVersion)
{
throw new InvalidOperationException($"Encryption file version {header.Version} is not supported.");
}
header.Reserved = await dataStream.Read4BitNumber();
header.KeyType = (ContainerKeyType)await dataStream.Read4BitNumber();
int encryptedKeySize = header.KeyType switch
{
ContainerKeyType.Rsa2048 => 256,
ContainerKeyType.Rsa3072 => 384,
ContainerKeyType.Rsa4096 => 512,
_ => throw new NotSupportedException($"Not support key type {header.KeyType}")
};
header.EncryptedDataSize = await dataStream.Read8BitNumber();
header.CertificateThumbprint = await dataStream.ReadConstatntString(40, Encoding.ASCII);
header.EncryptedKey = new byte[encryptedKeySize];
header.InitializeVector = new byte[16];
await dataStream.ReadAsync(header.EncryptedKey, 0, header.EncryptedKey.Length);
await dataStream.ReadAsync(header.InitializeVector, 0, header.InitializeVector.Length);
return(header);
}
}