public void TestInsufficientData()
{
byte[] buffer = new byte[16];
byte[] hmacKey = new byte[32];
byte[] aesKey = new byte[32];
Assert.ThrowsException <ArgumentException>(() => AesStatic.DecryptWithHmac(buffer, hmacKey, aesKey));
}
public void TestIllegalKeySize()
{
byte[] buffer = new byte[64];
byte[] rightKey = new byte[32];
byte[] wrongKey = new byte[16];
Assert.ThrowsException <ArgumentException>(() => AesStatic.EncryptWithHmac(buffer, wrongKey, rightKey));
Assert.ThrowsException <ArgumentException>(() => AesStatic.EncryptWithHmac(buffer, rightKey, wrongKey));
Assert.ThrowsException <ArgumentException>(() => AesStatic.DecryptWithHmac(buffer, wrongKey, rightKey));
Assert.ThrowsException <ArgumentException>(() => AesStatic.DecryptWithHmac(buffer, rightKey, wrongKey));
}
public void TestNullKeys()
{
byte[] buffer = new byte[64];
byte[] hmacKey = new byte[32];
byte[] aesKey = new byte[32];
Assert.ThrowsException <ArgumentNullException>(() => AesStatic.EncryptWithHmac(buffer, null !, aesKey));
Assert.ThrowsException <ArgumentNullException>(() => AesStatic.EncryptWithHmac(buffer, hmacKey, null !));
Assert.ThrowsException <ArgumentNullException>(() => AesStatic.DecryptWithHmac(buffer, null !, aesKey));
Assert.ThrowsException <ArgumentNullException>(() => AesStatic.DecryptWithHmac(buffer, hmacKey, null !));
}
public void TestEncryptDecrypt(string text)
{
byte[] hmacKey = new byte[32];
byte[] aesKey = new byte[32];
RandomNumberGenerator.Fill(hmacKey);
RandomNumberGenerator.Fill(aesKey);
ReadOnlyMemory <byte> data = Encoding.UTF8.GetBytes(text);
ReadOnlyMemory <byte> ciphertext = AesStatic.EncryptWithHmac(data, hmacKey, aesKey);
ReadOnlyMemory <byte> plaintext = AesStatic.DecryptWithHmac(ciphertext, hmacKey, aesKey);
MemoryAssert.AreEqual(data, plaintext);
}
[DataRow(LoremIpsum, 93)] // tamper later block
public void TestIntegrityCheck(string text, int tamperIndex)
{
byte[] hmacKey = new byte[32];
byte[] aesKey = new byte[32];
RandomNumberGenerator.Fill(hmacKey);
RandomNumberGenerator.Fill(aesKey);
ReadOnlyMemory <byte> data = Encoding.UTF8.GetBytes(text);
Memory <byte> ciphertext = MemoryMarshal.AsMemory(AesStatic.EncryptWithHmac(data, hmacKey, aesKey));
ciphertext.Span[tamperIndex] = (byte)~ciphertext.Span[tamperIndex];
Assert.ThrowsException <CryptographicException>(() => AesStatic.DecryptWithHmac(ciphertext, hmacKey, aesKey));
}
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);
}
private void Read_v1_2(PacketBuffer buf, byte[] hmacKey, byte[] aesKey)
{
Read_v1_2_Header(buf);
if (Algorithm == ContentAlgorithm.None)
{
Read_v1_2_Core(buf);
}
else if (Algorithm == ContentAlgorithm.Aes256CbcHmacSha256)
{
byte[] plain = AesStatic.DecryptWithHmac(buf, -1, hmacKey, aesKey);
HmacKey = hmacKey; // Assign public properties after successful decryption
AesKey = aesKey;
using (PacketBuffer innerBuf = PacketBuffer.CreateStatic(plain))
Read_v1_2_Core(innerBuf);
Available = true;
}
else
{
encryptedContent = buf.ReadByteArray(buf.Pending);
}
}