public static void TestFindHeaderBlockNotFound()
{
Headers headers = new Headers();
headers.HeaderBlocks.Add(new PreambleHeaderBlock());
headers.HeaderBlocks.Add(new VersionHeaderBlock(new byte[] { 4, 1, 2, 0, 0 }));
headers.HeaderBlocks.Add(new DataHeaderBlock());
FileInfoEncryptedHeaderBlock fileInfoHeaderBlock = headers.FindHeaderBlock <FileInfoEncryptedHeaderBlock>();
Assert.That(fileInfoHeaderBlock, Is.Null);
}
public static async Task TestGetOneAsymmetricCryptoFromHeaders(CryptoImplementation cryptoImplementation)
{
SetupAssembly.AssemblySetupCrypto(cryptoImplementation);
Headers headers = new Headers();
EncryptionParameters parameters = new EncryptionParameters(new V2Aes256CryptoFactory().CryptoId, new Passphrase("secrets"));
IAsymmetricPublicKey publicKey = New <IAsymmetricFactory>().CreatePublicKey(Resources.PublicKey1);
await parameters.AddAsync(new UserPublicKey[] { new UserPublicKey(EmailAddress.Parse("*****@*****.**"), publicKey), });
V2DocumentHeaders documentHeaders = new V2DocumentHeaders(parameters, 10);
using (V2HmacStream <MemoryStream> hmacStream = V2HmacStream.Create <MemoryStream>(new V2HmacCalculator(new SymmetricKey(new byte[0])), new MemoryStream()))
{
documentHeaders.WriteStartWithHmac(hmacStream);
hmacStream.Flush();
hmacStream.Chained.Position = 0;
using (V2AxCryptReader reader = new V2AxCryptReader(new LookAheadStream(hmacStream.Chained)))
{
while (reader.Read())
{
if (reader.CurrentItemType == AxCryptItemType.HeaderBlock)
{
headers.HeaderBlocks.Add(reader.CurrentHeaderBlock);
}
}
SymmetricKey dataEncryptingKey = documentHeaders.Headers.FindHeaderBlock <V2KeyWrapHeaderBlock>().MasterKey;
V2AsymmetricKeyWrapHeaderBlock readerAsymmetricKey = headers.FindHeaderBlock <V2AsymmetricKeyWrapHeaderBlock>();
IAsymmetricPrivateKey privateKey1 = New <IAsymmetricFactory>().CreatePrivateKey(Resources.PrivateKey1);
readerAsymmetricKey.SetPrivateKey(new V2Aes256CryptoFactory(), privateKey1);
Assert.That(dataEncryptingKey, Is.EqualTo(readerAsymmetricKey.Crypto(0).Key), "The asymmetric wrapped key should be the one in the ICrypto instance.");
IAsymmetricPrivateKey privateKey2 = New <IAsymmetricFactory>().CreatePrivateKey(Resources.PrivateKey2);
readerAsymmetricKey.SetPrivateKey(new V2Aes256CryptoFactory(), privateKey2);
Assert.That(readerAsymmetricKey.Crypto(0), Is.Null, "The ICrypto instance should be null, since the private key was wrong.");
}
}
}
/// <summary>
/// Loads an AxCrypt file from the specified reader. After this, the reader is positioned to
/// read encrypted data.
/// </summary>
/// <param name="passphrase">The passphrase.</param>
/// <param name="cryptoId">The crypto identifier.</param>
/// <param name="reader">The reader.</param>
/// <param name="headers">The headers.</param>
/// <returns>
/// True if the key was valid, false if it was wrong.
/// </returns>
private bool Load(Passphrase passphrase, Guid cryptoId, AxCryptReader reader, Headers headers)
{
ResetState();
if (cryptoId == new V1Aes128CryptoFactory().CryptoId)
{
return(PassphraseIsValid);
}
_reader = reader;
CryptoFactory = Resolve.CryptoFactory.Create(cryptoId);
V2KeyWrapHeaderBlock keyWrap = headers.FindHeaderBlock <V2KeyWrapHeaderBlock>();
IDerivedKey key = CryptoFactory.RestoreDerivedKey(passphrase, keyWrap.DerivationSalt, keyWrap.DerivationIterations);
keyWrap.SetDerivedKey(CryptoFactory, key);
DocumentHeaders = new V2DocumentHeaders(keyWrap);
PassphraseIsValid = DocumentHeaders.Load(headers);
Properties = EncryptedProperties.Create(this);
return(PassphraseIsValid);
}
public static void TestGetCryptoFromHeaders(CryptoImplementation cryptoImplementation)
{
SetupAssembly.AssemblySetupCrypto(cryptoImplementation);
Headers headers = new Headers();
V2DocumentHeaders documentHeaders = new V2DocumentHeaders(new EncryptionParameters(new V2Aes256CryptoFactory().CryptoId, new Passphrase("passphrase")), 10);
using (V2HmacStream <MemoryStream> stream = V2HmacStream.Create <MemoryStream>(new V2HmacCalculator(new SymmetricKey(new byte[0])), new MemoryStream()))
{
documentHeaders.WriteStartWithHmac(stream);
stream.Flush();
stream.Chained.Position = 0;
using (V2AxCryptReader reader = new V2AxCryptReader(new LookAheadStream(stream.Chained)))
{
while (reader.Read())
{
if (reader.CurrentItemType == AxCryptItemType.HeaderBlock)
{
headers.HeaderBlocks.Add(reader.CurrentHeaderBlock);
}
}
SymmetricKey dataEncryptingKey = documentHeaders.Headers.FindHeaderBlock <V2KeyWrapHeaderBlock>().MasterKey;
V2KeyWrapHeaderBlock keyWrap = headers.FindHeaderBlock <V2KeyWrapHeaderBlock>();
IDerivedKey key = new V2Aes256CryptoFactory().RestoreDerivedKey(new Passphrase("passphrase"), keyWrap.DerivationSalt, keyWrap.DerivationIterations);
keyWrap.SetDerivedKey(new V2Aes256CryptoFactory(), key);
Assert.That(dataEncryptingKey, Is.EqualTo(keyWrap.MasterKey));
key = new V2Aes256CryptoFactory().RestoreDerivedKey(new Passphrase("wrong"), keyWrap.DerivationSalt, keyWrap.DerivationIterations);
keyWrap.SetDerivedKey(new V2Aes256CryptoFactory(), key);
Assert.That(dataEncryptingKey, Is.Not.EqualTo(keyWrap.MasterKey));
}
}
}
