internal AssuredStreamHeader(AssuredStreamCreateArgs args)
{
if (args == null)
{
throw new ArgumentNullException("args");
}
args.VerifyArgs("args");
_fileType = args.FileType;
_hashType = args.HashType;
if (args.StrongNameKey == null)
{
_fileHash = new byte[QQnCryptoHelpers.GetHashBits(_hashType) / 8];
_hashSignature = new byte[0];
}
else
{
_snk = args.StrongNameKey;
_fileHash = new byte[_snk.HashLength];
_hashSignature = new byte[_snk.SignatureLength];
_hashType = _snk.HashType;
}
_guid = args.NullGuid ? Guid.Empty : Guid.NewGuid();
}
/// <summary>
/// Initializes a new instance of the <see cref="AssuredSubStream"/> class.
/// </summary>
/// <param name="parentStream">The parent stream.</param>
/// <param name="verificationMode">The verification mode.</param>
public AssuredSubStream(Stream parentStream, VerificationMode verificationMode)
: base(parentStream, true)
{
AssuredStream signedParent = GetService <AssuredStream>();
if (signedParent != null)
{
_snk = signedParent.AssemblyStrongNameKey;
_hashType = signedParent.HashType;
}
else
{
_hashType = HashType.SHA1;
}
_headerPosition = parentStream.Position;
_streamHash = new byte[QQnCryptoHelpers.GetHashBits(_hashType) / 8];
_hashSignature = new byte[(_snk != null) ? _snk.SignatureLength : 0];
if (parentStream.CanWrite && parentStream.CanSeek && parentStream.Position == parentStream.Length)
{
_updating = true;
WriteHeader();
}
else
{
QQnBinaryReader br = new QQnBinaryReader(BaseStream);
_streamHash = br.ReadBytes(_streamHash.Length);
_hashSignature = br.ReadBytes(_hashSignature.Length);
_hashLength = br.ReadInt64();
_hashPosition = BaseStream.Position;
if (verificationMode != VerificationMode.None)
{
if (_snk != null && !_snk.VerifyHash(_streamHash, _hashSignature))
{
throw new CryptographicException("Stream hash verification failed");
}
}
if (verificationMode == VerificationMode.Full)
{
if (!VerifyHash())
{
throw new CryptographicException("Invalid hash value");
}
}
}
}
