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using Hazel.Dtls;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Security.Cryptography;
using System.Text;
namespace Hazel.UnitTests.Dtls
{
[TestClass]
public class AesGcmRecordProtectedTests
{
private readonly ByteSpan masterSecret;
private readonly ByteSpan serverRandom;
private readonly ByteSpan clientRandom;
private const string TestMessage = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
public AesGcmRecordProtectedTests()
{
this.masterSecret = new byte[48];
this.serverRandom = new byte[32];
this.clientRandom = new byte[32];
using (RandomNumberGenerator random = RandomNumberGenerator.Create())
{
random.GetBytes(this.masterSecret.GetUnderlyingArray());
random.GetBytes(this.serverRandom.GetUnderlyingArray());
random.GetBytes(this.clientRandom.GetUnderlyingArray());
}
}
[TestMethod]
public void ServerCanEncryptAndDecryptData()
{
using (Aes128GcmRecordProtection recordProtection = new Aes128GcmRecordProtection(this.masterSecret, this.serverRandom, this.clientRandom))
{
byte[] messageAsBytes = Encoding.UTF8.GetBytes(TestMessage);
Record record = new Record();
record.ContentType = ContentType.ApplicationData;
record.ProtocolVersion = ProtocolVersion.DTLS1_2;
record.Epoch = 1;
record.SequenceNumber = 124;
record.Length = (ushort)recordProtection.GetEncryptedSize(messageAsBytes.Length);
ByteSpan encrypted = new byte[record.Length];
recordProtection.EncryptServerPlaintext(encrypted, messageAsBytes, ref record);
ByteSpan plaintext = new byte[recordProtection.GetDecryptedSize(encrypted.Length)];
bool couldDecrypt = recordProtection.DecryptCiphertextFromServer(plaintext, encrypted, ref record);
Assert.IsTrue(couldDecrypt);
Assert.AreEqual(messageAsBytes.Length, plaintext.Length);
Assert.AreEqual(TestMessage, Encoding.UTF8.GetString(plaintext.GetUnderlyingArray(), plaintext.Offset, plaintext.Length));
}
}
[TestMethod]
public void ClientCanEncryptAndDecryptData()
{
using (Aes128GcmRecordProtection recordProtection = new Aes128GcmRecordProtection(this.masterSecret, this.serverRandom, this.clientRandom))
{
byte[] messageAsBytes = Encoding.UTF8.GetBytes(TestMessage);
Record record = new Record();
record.ContentType = ContentType.ApplicationData;
record.ProtocolVersion = ProtocolVersion.DTLS1_2;
record.Epoch = 1;
record.SequenceNumber = 124;
record.Length = (ushort)recordProtection.GetEncryptedSize(messageAsBytes.Length);
ByteSpan encrypted = new byte[record.Length];
recordProtection.EncryptClientPlaintext(encrypted, messageAsBytes, ref record);
ByteSpan plaintext = new byte[recordProtection.GetDecryptedSize(encrypted.Length)];
bool couldDecrypt = recordProtection.DecryptCiphertextFromClient(plaintext, encrypted, ref record);
Assert.IsTrue(couldDecrypt);
Assert.AreEqual(messageAsBytes.Length, plaintext.Length);
Assert.AreEqual(TestMessage, Encoding.UTF8.GetString(plaintext.GetUnderlyingArray(), plaintext.Offset, plaintext.Length));
}
}
[TestMethod]
public void ServerDecryptionFailsWhenRecordModified()
{
using (Aes128GcmRecordProtection recordProtection = new Aes128GcmRecordProtection(this.masterSecret, this.serverRandom, this.clientRandom))
{
byte[] messageAsBytes = Encoding.UTF8.GetBytes(TestMessage);
Record originalRecord = new Record();
originalRecord.ContentType = ContentType.ApplicationData;
originalRecord.ProtocolVersion = ProtocolVersion.DTLS1_2;
originalRecord.Epoch = 1;
originalRecord.SequenceNumber = 124;
originalRecord.Length = (ushort)recordProtection.GetEncryptedSize(messageAsBytes.Length);
ByteSpan encrypted = new byte[originalRecord.Length];
recordProtection.EncryptServerPlaintext(encrypted, messageAsBytes, ref originalRecord);
ByteSpan plaintext = new byte[recordProtection.GetDecryptedSize(encrypted.Length)];
Record record = originalRecord;
record.ContentType = ContentType.Handshake;
bool couldDecrypt = recordProtection.DecryptCiphertextFromServer(plaintext, encrypted, ref record);
Assert.IsFalse(couldDecrypt);
record = originalRecord;
record.Epoch++;
couldDecrypt = recordProtection.DecryptCiphertextFromServer(plaintext, encrypted, ref record);
Assert.IsFalse(couldDecrypt);
record = originalRecord;
record.SequenceNumber++;
couldDecrypt = recordProtection.DecryptCiphertextFromServer(plaintext, encrypted, ref record);
Assert.IsFalse(couldDecrypt);
}
}
[TestMethod]
public void ClientDecryptionFailsWhenRecordModified()
{
using (Aes128GcmRecordProtection recordProtection = new Aes128GcmRecordProtection(this.masterSecret, this.serverRandom, this.clientRandom))
{
byte[] messageAsBytes = Encoding.UTF8.GetBytes(TestMessage);
Record originalRecord = new Record();
originalRecord.ContentType = ContentType.ApplicationData;
originalRecord.ProtocolVersion = ProtocolVersion.DTLS1_2;
originalRecord.Epoch = 1;
originalRecord.SequenceNumber = 124;
originalRecord.Length = (ushort)recordProtection.GetEncryptedSize(messageAsBytes.Length);
ByteSpan encrypted = new byte[originalRecord.Length];
recordProtection.EncryptClientPlaintext(encrypted, messageAsBytes, ref originalRecord);
ByteSpan plaintext = new byte[recordProtection.GetDecryptedSize(encrypted.Length)];
Record record = originalRecord;
record.ContentType = ContentType.Handshake;
bool couldDecrypt = recordProtection.DecryptCiphertextFromClient(plaintext, encrypted, ref record);
Assert.IsFalse(couldDecrypt);
record = originalRecord;
record.Epoch++;
couldDecrypt = recordProtection.DecryptCiphertextFromClient(plaintext, encrypted, ref record);
Assert.IsFalse(couldDecrypt);
record = originalRecord;
record.SequenceNumber++;
couldDecrypt = recordProtection.DecryptCiphertextFromClient(plaintext, encrypted, ref record);
Assert.IsFalse(couldDecrypt);
}
}
[TestMethod]
public void ServerEncryptionCanoverlap()
{
using (Aes128GcmRecordProtection recordProtection = new Aes128GcmRecordProtection(this.masterSecret, this.serverRandom, this.clientRandom))
{
ByteSpan messageAsBytes = Encoding.UTF8.GetBytes(TestMessage);
Record record = new Record();
record.ContentType = ContentType.ApplicationData;
record.ProtocolVersion = ProtocolVersion.DTLS1_2;
record.Epoch = 1;
record.SequenceNumber = 124;
record.Length = (ushort)recordProtection.GetEncryptedSize(messageAsBytes.Length);
ByteSpan encrypted = new byte[record.Length];
messageAsBytes.CopyTo(encrypted);
recordProtection.EncryptServerPlaintext(encrypted, encrypted.Slice(0, messageAsBytes.Length), ref record);
ByteSpan plaintext = encrypted.Slice(0, recordProtection.GetDecryptedSize(record.Length));
bool couldDecrypt = recordProtection.DecryptCiphertextFromServer(plaintext, encrypted, ref record);
Assert.IsTrue(couldDecrypt);
Assert.AreEqual(messageAsBytes.Length, plaintext.Length);
Assert.AreEqual(TestMessage, Encoding.UTF8.GetString(plaintext.GetUnderlyingArray(), plaintext.Offset, plaintext.Length));
}
}
[TestMethod]
public void ClientEncryptionCanoverlap()
{
using (Aes128GcmRecordProtection recordProtection = new Aes128GcmRecordProtection(this.masterSecret, this.serverRandom, this.clientRandom))
{
ByteSpan messageAsBytes = Encoding.UTF8.GetBytes(TestMessage);
Record record = new Record();
record.ContentType = ContentType.ApplicationData;
record.ProtocolVersion = ProtocolVersion.DTLS1_2;
record.Epoch = 1;
record.SequenceNumber = 124;
record.Length = (ushort)recordProtection.GetEncryptedSize(messageAsBytes.Length);
ByteSpan encrypted = new byte[record.Length];
messageAsBytes.CopyTo(encrypted);
recordProtection.EncryptClientPlaintext(encrypted, encrypted.Slice(0, messageAsBytes.Length), ref record);
ByteSpan plaintext = encrypted.Slice(0, recordProtection.GetDecryptedSize(record.Length));
bool couldDecrypt = recordProtection.DecryptCiphertextFromClient(plaintext, encrypted, ref record);
Assert.IsTrue(couldDecrypt);
Assert.AreEqual(messageAsBytes.Length, plaintext.Length);
Assert.AreEqual(TestMessage, Encoding.UTF8.GetString(plaintext.GetUnderlyingArray(), plaintext.Offset, plaintext.Length));
}
}
}
}
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