public void Does_throw_on_old_messages()
{
var client = CreateClient();
var request = new HelloSecure {
Name = "World"
};
byte[] cryptKey, authKey, iv;
AesUtils.CreateCryptAuthKeysAndIv(out cryptKey, out authKey, out iv);
var cryptAuthKeys = cryptKey.Combine(authKey);
var rsaEncCryptAuthKeys = RsaUtils.Encrypt(cryptAuthKeys, SecureConfig.PublicKeyXml);
var authRsaEncCryptAuthKeys = HmacUtils.Authenticate(rsaEncCryptAuthKeys, authKey, iv);
var timestamp = DateTime.UtcNow.Subtract(TimeSpan.FromMinutes(21)).ToUnixTime();
var requestBody = timestamp + " POST " + typeof(HelloSecure).Name + " " + request.ToJson();
var encryptedBytes = AesUtils.Encrypt(requestBody.ToUtf8Bytes(), cryptKey, iv);
var authEncryptedBytes = HmacUtils.Authenticate(encryptedBytes, authKey, iv);
try
{
var encryptedMessage = new EncryptedMessage
{
EncryptedSymmetricKey = Convert.ToBase64String(authRsaEncCryptAuthKeys),
EncryptedBody = Convert.ToBase64String(authEncryptedBytes),
};
var encResponse = client.Post(encryptedMessage);
Assert.Fail("Should throw");
}
catch (WebServiceException ex)
{
ex.StatusDescription.Print();
var errorResponse = (EncryptedMessageResponse)ex.ResponseDto;
authEncryptedBytes = Convert.FromBase64String(errorResponse.EncryptedBody);
if (!HmacUtils.Verify(authEncryptedBytes, authKey))
{
throw new Exception("EncryptedBody is Invalid");
}
var responseBytes = HmacUtils.DecryptAuthenticated(authEncryptedBytes, cryptKey);
var responseJson = responseBytes.FromUtf8Bytes();
var response = responseJson.FromJson <ErrorResponse>();
Assert.That(response.ResponseStatus.Message, Is.EqualTo("Request too old"));
}
}
public void Can_Send_Encrypted_Message()
{
var client = CreateClient();
var request = new HelloSecure {
Name = "World"
};
byte[] cryptKey, authKey, iv;
AesUtils.CreateCryptAuthKeysAndIv(out cryptKey, out authKey, out iv);
var cryptAuthKeys = cryptKey.Combine(authKey);
var rsaEncCryptAuthKeys = RsaUtils.Encrypt(cryptAuthKeys, SecureConfig.PublicKeyXml);
var authRsaEncCryptAuthKeys = HmacUtils.Authenticate(rsaEncCryptAuthKeys, authKey, iv);
var timestamp = DateTime.UtcNow.ToUnixTime();
var requestBody = timestamp + " POST " + typeof(HelloSecure).Name + " " + request.ToJson();
var encryptedBytes = AesUtils.Encrypt(requestBody.ToUtf8Bytes(), cryptKey, iv);
var authEncryptedBytes = HmacUtils.Authenticate(encryptedBytes, authKey, iv);
var encryptedMessage = new EncryptedMessage
{
EncryptedSymmetricKey = Convert.ToBase64String(authRsaEncCryptAuthKeys),
EncryptedBody = Convert.ToBase64String(authEncryptedBytes),
};
var encResponse = client.Post(encryptedMessage);
authEncryptedBytes = Convert.FromBase64String(encResponse.EncryptedBody);
if (!HmacUtils.Verify(authEncryptedBytes, authKey))
{
throw new Exception("Invalid EncryptedBody");
}
var decryptedBytes = HmacUtils.DecryptAuthenticated(authEncryptedBytes, cryptKey);
var responseJson = decryptedBytes.FromUtf8Bytes();
var response = responseJson.FromJson <HelloSecureResponse>();
Assert.That(response.Result, Is.EqualTo("Hello, World!"));
}
public void Does_Hybrid_RSA_Crypt_and_Auth_AES_with_HMAC_SHA256()
{
var request = new HelloSecure {
Name = "World"
};
var timestamp = DateTime.UtcNow.ToUnixTime();
var msg = timestamp + " POST " + request.GetType().Name + " " + request.ToJson();
var msgBytes = msg.ToUtf8Bytes();
byte[] cryptKey, authKey, iv;
AesUtils.CreateCryptAuthKeysAndIv(out cryptKey, out authKey, out iv);
var encryptedBytes = AesUtils.Encrypt(msgBytes, cryptKey, iv);
var decryptedBytes = AesUtils.Decrypt(encryptedBytes, cryptKey, iv);
Assert.That(decryptedBytes, Is.EquivalentTo(msgBytes));
var authEncryptedBytes = HmacUtils.Authenticate(encryptedBytes, authKey, iv);
var cryptAuthKeys = cryptKey.Combine(authKey);
var rsaEncCryptAuthKeys = RsaUtils.Encrypt(cryptAuthKeys, SecureConfig.PublicKeyXml);
var authRsaEncCryptAuthKeys = HmacUtils.Authenticate(rsaEncCryptAuthKeys, authKey, iv);
var decryptedMsg = ValidateAndDecrypt(authRsaEncCryptAuthKeys, authEncryptedBytes);
var parts = decryptedMsg.SplitOnFirst(' ');
Assert.That(long.Parse(parts[0]), Is.EqualTo(timestamp));
parts = parts[1].SplitOnFirst(' ');
Assert.That(parts[0], Is.EqualTo("POST"));
parts = parts[1].SplitOnFirst(' ');
Assert.That(parts[0], Is.EqualTo(request.GetType().Name));
var decryptedJson = parts[1];
var decryptedRequest = decryptedJson.FromJson <HelloSecure>();
Assert.That(decryptedRequest.Name, Is.EqualTo(request.Name));
}