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 static AesKeyIvPair GenAesKeyIvPair()
{
var result = new AesKeyIvPair();
MiscFuncs.GetRandomBytes(result.Iv);
MiscFuncs.GetRandomBytes(result.Key);
return result;
}
public static AesKeyIvPair GenAesKeyIvPair()
{
var result = new AesKeyIvPair();
MiscFuncs.GetRandomBytes(result.Iv);
MiscFuncs.GetRandomBytes(result.Key);
return(result);
}