public void TestAesHmac()
{
byte[] hmac = AesStatic.GenerateKey();
byte[] key = AesStatic.GenerateKey();
byte[] iv = AesStatic.GenerateIV();
Random random = new Random();
byte[] plaintext = new byte[69854];
random.NextBytes(plaintext);
PacketBuffer ciphertext = PacketBuffer.CreateDynamic();
AesStatic.EncryptWithHmac(plaintext, ciphertext, false, hmac, key);
ciphertext.Position = 0;
byte[] result = AesStatic.DecryptWithHmac(ciphertext, -1, hmac, key);
CollectionAssert.AreEqual(plaintext, result);
}
public void TestAes()
{
byte[] key = AesStatic.GenerateKey();
Assert.IsNotNull(key);
byte[] iv = AesStatic.GenerateIV();
Assert.IsNotNull(iv);
Random random = new Random();
byte[] plaintext = new byte[45674];
random.NextBytes(plaintext);
byte[] ciphertext = AesStatic.Encrypt(plaintext, key, iv);
Assert.IsNotNull(ciphertext);
Assert.AreEqual(ciphertext.Length, Util.GetTotalSize(plaintext.Length, 16));
byte[] decrypted = AesStatic.Decrypt(ciphertext, key, iv);
Assert.IsNotNull(decrypted);
CollectionAssert.AreEqual(plaintext, decrypted);
}
private FileMeta(ContentAlgorithm algorithm, byte[] hmacKey, byte[] aesKey, byte[] fileKey)
{
Algorithm = algorithm;
AesKey = aesKey;
HmacKey = hmacKey;
FileKey = fileKey;
if (Algorithm == ContentAlgorithm.Aes256CbcHmacSha256)
{
if (AesKey == null)
{
AesKey = AesStatic.GenerateKey();
}
else if (AesKey.Length != 32)
{
throw new ArgumentOutOfRangeException(nameof(aesKey));
}
if (hmacKey == null)
{
HmacKey = AesStatic.GenerateKey();
}
else if (HmacKey.Length != 32)
{
throw new ArgumentOutOfRangeException(nameof(hmacKey));
}
if (fileKey == null)
{
FileKey = AesStatic.GenerateKey();
}
else if (FileKey.Length != 32)
{
throw new ArgumentOutOfRangeException(nameof(fileKey));
}
FileEncryption = ContentAlgorithm.Aes256Cbc; // The file needs no HMAC as we have an SHA256
}
}
private void btnAesGenerate_Click(object sender, EventArgs e) => tbAesKey.Text = Util.ToHexString(AesStatic.GenerateKey());
