public void TestDecryptWrongAesKey()
{
const string dataFileName = "PNG_transparency_demonstration_1.png";
Assert.Equal(true, File.Exists(dataFileName));
var dataToEncrypt = File.ReadAllBytes(dataFileName);
var pass = Encoding.UTF8.GetBytes("TestPassword");
var salt = new byte[32];
var mySha256 = SHA256.Create();
int seed =
BitConverter.ToInt32(mySha256.ComputeHash(BitConverter.GetBytes((int)DateTime.UtcNow.Ticks & DateTime.UtcNow.Millisecond)), 0);
var randomSource = new Random(seed);
randomSource.NextBytes(salt);
var keyIvGenerated = CryptConfigFileHelper.GenKeyAndIv(pass, salt);
byte[] encryptedData = keyIvGenerated.EncryptData(dataToEncrypt);
var changedKey = new byte[keyIvGenerated.Key.Length];
keyIvGenerated.Key.CopyTo(changedKey, 0);
changedKey[0] = (byte)(changedKey[0] ^ 3);
Assert.Throws <EnumException <AesKeyIvPair.EDecryptDataErrCodes> >(() =>
{
byte[] originData = new AesKeyIvPair {
Iv = keyIvGenerated.Iv, Key = changedKey
}
.DecryptData(encryptedData);
_output.WriteLine("Err key decrypted");
Assert.Equal(originData, dataToEncrypt);
});
}
public void TestEncryptDecrypt()
{
var passBytes = Encoding.UTF8.GetBytes("TestPassword");
var testCertificate =
LightCertificatesHelper.GenerateSelfSignedCertificate(
ELightCertificateSignType.Rsa,
2048,
ELightCertificateEncryptType.Rsa,
2048,
EPrivateKeysKeyDerivationFunction.ScryptDefault,
Guid.NewGuid(),
"TestCertificate",
passBytes
);
foreach (var n in new[] { 1, 2, 3, 5, 10, 16, 32, 48, 64, 63, 65, 191 })
{
var originData = new byte[n];
MiscFuncs.GetRandomBytes(originData);
var encryptedData = testCertificate.EncryptData(originData);
var originDataCopy = testCertificate.DecryptData(encryptedData, passBytes);
Assert.Equal(originData.Length, originDataCopy.Length);
Assert.Equal(originData, originDataCopy);
}
for (int i = 0; i < 10; i++)
{
var aesPair = AesKeyIvPair.GenAesKeyIvPair();
var encryptedPair = LightCertificatesHelper.EncryptAesKeyIvPair(
aesPair,
testCertificate
);
var decryptedPair = LightCertificatesHelper.DecryptAesKeyIvPair(
encryptedPair,
testCertificate,
passBytes
);
Assert.Equal(
aesPair.WriteObjectToJson(),
decryptedPair.WriteObjectToJson()
);
}
}