protected override void Read(BinaryReader reader)
{
base.Read(reader);
KeyThumbprint encryptionKeyThumbprint = reader.ReadKeyThumbprint();
if (!encryptionKeyThumbprint.Equals(_decryptionKey.Thumbprint))
{
throw new System.IO.IOException();
}
CngKey publicSourceKey = reader.ReadPublicKey().Key;
reader.ReadBytes(PaddingLength);
byte[] encryptedData = reader.ReadBytes(_plainTextData.Length);
using (ECDiffieHellmanCng destinationKey = new ECDiffieHellmanCng(_decryptionKey.Key)) {
_plainTextData = Decrypt(destinationKey, publicSourceKey, encryptedData, 0, encryptedData.Length);
}
}
/// <summary>
/// Read this cluster from a byte array.
/// </summary>
/// <param name="bytes"></param>
/// <param name="offset"></param>
/// <param name="signatureKeys"></param>
/// <param name="options"></param>
public void Read(byte[] bytes, int offset, IDictionary <KeyThumbprint, PublicKey> signatureKeys, Options options)
{
if (bytes == null)
{
throw new ArgumentNullException(nameof(bytes));
}
if (signatureKeys == null)
{
throw new ArgumentNullException(nameof(signatureKeys));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (offset + _clusterSizeBytes > bytes.Length)
{
throw new ArgumentException("Not enough space in byte array for cluster.");
}
using (var stream = new MemoryStream(bytes, offset, _clusterSizeBytes))
using (var reader = new BinaryReader(stream)) {
if (!reader.ReadBytes(Constants.SrfsMarkerLength).SequenceEqual(Constants.SrfsMarker))
{
throw new InvalidClusterException("Invalid Marker");
}
if (!reader.ReadBytes(Constants.CurrentVersionLength).SequenceEqual(Constants.CurrentVersion))
{
throw new InvalidClusterException("Unsupported Version");
}
Signature signature = reader.ReadSignature();
byte[] hash = reader.ReadBytes(Constants.HashLength);
KeyThumbprint signatureThumbprint = reader.ReadKeyThumbprint();
if (options.VerifyClusterHashes() && !hash.SequenceEqual(calculateHash(bytes, offset)))
{
throw new InvalidHashException();
}
if (options.VerifyClusterSignatures())
{
PublicKey key = null;
if (!signatureKeys.TryGetValue(signatureThumbprint, out key))
{
throw new MissingKeyException(signatureThumbprint);
}
if (!signature.Verify(bytes, offset + HashPosition, Constants.HashLength, key.Key))
{
throw new InvalidSignatureException();
}
}
_volumeID = reader.ReadGuid();
_clusterType = reader.ReadClusterType();
Read(reader);
_isModified = false;
}
}
public MissingKeyException(KeyThumbprint thumbprint)
{
_thumbprint = thumbprint;
}
public CngKey GetSignatureKey(KeyThumbprint thumbprint)
{
return(null);
}