public static EncryptedProperties Create(Stream stream, LogOnIdentity identity)
{
if (identity == null)
{
throw new ArgumentNullException("identity");
}
if (identity == LogOnIdentity.Empty)
{
return(Invalid);
}
EncryptedProperties properties = new EncryptedProperties(null);
using (IAxCryptDocument document = New <AxCryptFactory>().CreateDocument(identity.DecryptionParameters(), stream))
{
if (!document.PassphraseIsValid)
{
return(Invalid);
}
properties = new EncryptedProperties(document.FileName);
properties.SharedKeyHolders = document.AsymmetricRecipients;
properties.DecryptionParameter = document.DecryptionParameter;
properties.FileMetaData.CreationTimeUtc = document.CreationTimeUtc;
properties.FileMetaData.LastWriteTimeUtc = document.LastWriteTimeUtc;
properties.FileMetaData.LastAccessTimeUtc = document.LastAccessTimeUtc;
properties.IsValid = true;
}
return(properties);
}
private static IAxCryptDocument Document(Stream source, LogOnIdentity identity, string displayContext, IProgressContext progress)
{
if (identity == null)
{
throw new ArgumentNullException(nameof(identity));
}
IAxCryptDocument document = New <AxCryptFactory>().CreateDocument(identity.DecryptionParameters(), new ProgressStream(source, progress));
return(document);
}
public static bool IsKeyShared(this IDataStore dataStore, LogOnIdentity decryptIdentity)
{
if (!dataStore.IsEncrypted())
{
return(false);
}
OpenFileProperties properties = OpenFileProperties.Create(dataStore);
if (properties.IsLegacyV1 || properties.V2AsymetricKeyWrapCount <= 1)
{
return(false);
}
if (decryptIdentity == LogOnIdentity.Empty)
{
return(false);
}
using (Stream stream = dataStore.OpenRead())
{
using (IAxCryptDocument document = New <AxCryptFactory>().CreateDocument(decryptIdentity.DecryptionParameters(), stream))
{
if (!document.PassphraseIsValid)
{
return(false);
}
return(document.AsymmetricRecipients.Select(ar => ar.Email).Distinct().Skip(1).Any());
}
}
}
