public static void TestInvalidHmacInCopyEncryptedTo()
{
using (AxCryptDocument document = new AxCryptDocument())
{
Passphrase passphrase = new Passphrase("a");
bool keyIsOk = document.Load(FakeRuntimeFileInfo.ExpandableMemoryStream(Resources.helloworld_key_a_txt), passphrase.DerivedPassphrase);
Assert.That(keyIsOk, Is.True, "The passphrase provided is correct and should work!");
Passphrase newPassphrase = new Passphrase("b");
using (Stream changedStream = new MemoryStream())
{
DocumentHeaders outputDocumentHeaders = new DocumentHeaders(document.DocumentHeaders);
outputDocumentHeaders.SetCurrentVersion();
outputDocumentHeaders.RewrapMasterKey(newPassphrase.DerivedPassphrase);
byte[] modifiedHmacBytes = document.DocumentHeaders.Hmac.GetBytes();
modifiedHmacBytes[0] += 1;
document.DocumentHeaders.Hmac = new DataHmac(modifiedHmacBytes);
Assert.Throws <Axantum.AxCrypt.Core.Runtime.InvalidDataException>(() =>
{
document.CopyEncryptedTo(outputDocumentHeaders, changedStream, new ProgressContext());
});
}
}
}
public static void TestChangePassphraseForSimpleFile()
{
using (AxCryptDocument document = new AxCryptDocument())
{
Passphrase passphrase = new Passphrase("a");
bool keyIsOk = document.Load(FakeRuntimeFileInfo.ExpandableMemoryStream(Resources.helloworld_key_a_txt), passphrase.DerivedPassphrase);
Assert.That(keyIsOk, Is.True, "The passphrase provided is correct and should work!");
Passphrase newPassphrase = new Passphrase("b");
using (Stream changedStream = new MemoryStream())
{
DocumentHeaders outputDocumentHeaders = new DocumentHeaders(document.DocumentHeaders);
outputDocumentHeaders.SetCurrentVersion();
outputDocumentHeaders.RewrapMasterKey(newPassphrase.DerivedPassphrase);
document.CopyEncryptedTo(outputDocumentHeaders, changedStream, new ProgressContext());
changedStream.Position = 0;
using (AxCryptDocument changedDocument = new AxCryptDocument())
{
bool changedKeyIsOk = changedDocument.Load(changedStream, newPassphrase.DerivedPassphrase);
Assert.That(changedKeyIsOk, Is.True, "The changed passphrase provided is correct and should work!");
using (MemoryStream plaintextStream = new MemoryStream())
{
changedDocument.DecryptTo(plaintextStream, new ProgressContext());
Assert.That(Encoding.ASCII.GetString(plaintextStream.GetBuffer(), 0, (int)plaintextStream.Length), Is.EqualTo("HelloWorld"), "Unexpected result of decryption.");
Assert.That(changedDocument.DocumentHeaders.PlaintextLength, Is.EqualTo(10), "'HelloWorld' should be 10 bytes uncompressed plaintext.");
}
}
}
}
}
public static void TestChangePassphraseForSimpleFile()
{
using (AxCryptDocument document = new AxCryptDocument())
{
Passphrase passphrase = new Passphrase("a");
bool keyIsOk = document.Load(FakeRuntimeFileInfo.ExpandableMemoryStream(Resources.helloworld_key_a_txt), passphrase.DerivedPassphrase);
Assert.That(keyIsOk, Is.True, "The passphrase provided is correct and should work!");
Passphrase newPassphrase = new Passphrase("b");
using (Stream changedStream = new MemoryStream())
{
DocumentHeaders outputDocumentHeaders = new DocumentHeaders(document.DocumentHeaders);
outputDocumentHeaders.SetCurrentVersion();
outputDocumentHeaders.RewrapMasterKey(newPassphrase.DerivedPassphrase);
document.CopyEncryptedTo(outputDocumentHeaders, changedStream, new ProgressContext());
changedStream.Position = 0;
using (AxCryptDocument changedDocument = new AxCryptDocument())
{
bool changedKeyIsOk = changedDocument.Load(changedStream, newPassphrase.DerivedPassphrase);
Assert.That(changedKeyIsOk, Is.True, "The changed passphrase provided is correct and should work!");
using (MemoryStream plaintextStream = new MemoryStream())
{
changedDocument.DecryptTo(plaintextStream, new ProgressContext());
Assert.That(Encoding.ASCII.GetString(plaintextStream.GetBuffer(), 0, (int)plaintextStream.Length), Is.EqualTo("HelloWorld"), "Unexpected result of decryption.");
Assert.That(changedDocument.DocumentHeaders.PlaintextLength, Is.EqualTo(10), "'HelloWorld' should be 10 bytes uncompressed plaintext.");
}
}
}
}
}
public static void TestInvalidHmacInCopyEncryptedTo()
{
using (AxCryptDocument document = new AxCryptDocument())
{
Passphrase passphrase = new Passphrase("a");
bool keyIsOk = document.Load(FakeRuntimeFileInfo.ExpandableMemoryStream(Resources.helloworld_key_a_txt), passphrase.DerivedPassphrase);
Assert.That(keyIsOk, Is.True, "The passphrase provided is correct and should work!");
Passphrase newPassphrase = new Passphrase("b");
using (Stream changedStream = new MemoryStream())
{
DocumentHeaders outputDocumentHeaders = new DocumentHeaders(document.DocumentHeaders);
outputDocumentHeaders.SetCurrentVersion();
outputDocumentHeaders.RewrapMasterKey(newPassphrase.DerivedPassphrase);
byte[] modifiedHmacBytes = document.DocumentHeaders.Hmac.GetBytes();
modifiedHmacBytes[0] += 1;
document.DocumentHeaders.Hmac = new DataHmac(modifiedHmacBytes);
Assert.Throws<Axantum.AxCrypt.Core.Runtime.InvalidDataException>(() =>
{
document.CopyEncryptedTo(outputDocumentHeaders, changedStream, new ProgressContext());
});
}
}
}
