public void Does_Hybrid_RSA_SHA512_AES_MasterKey_and_HmacSha256()
{
var request = new HelloSecure {
Name = "World"
};
var msgBytes = request.ToJson().ToUtf8Bytes();
byte[] masterKey, iv;
AesUtils.CreateKeyAndIv(out masterKey, out iv);
var sha512KeyBytes = masterKey.ToSha512HashBytes();
var cryptKey = new byte[sha512KeyBytes.Length / 2];
var authKey = new byte[sha512KeyBytes.Length / 2];
Buffer.BlockCopy(sha512KeyBytes, 0, cryptKey, 0, cryptKey.Length);
Buffer.BlockCopy(sha512KeyBytes, cryptKey.Length, authKey, 0, authKey.Length);
var encryptedBytes = AesUtils.Encrypt(msgBytes, cryptKey, iv);
var authEncryptedBytes = HmacUtils.Authenticate(encryptedBytes, authKey, iv);
var aesKeyNonceBytes = iv.Combine(masterKey);
var rsaEncAesKeyNonceBytes = RsaUtils.Encrypt(aesKeyNonceBytes, SecureConfig.PublicKeyXml);
var json = ValidateAndDecryptWithMasterKey(rsaEncAesKeyNonceBytes, authEncryptedBytes);
var fromJson = json.FromJson <HelloSecure>();
Assert.That(fromJson.Name, Is.EqualTo(request.Name));
}
public void Does_throw_on_replayed_messages()
{
var client = CreateClient();
var request = new HelloSecure {
Name = "World"
};
byte[] cryptKey, iv;
AesUtils.CreateKeyAndIv(out cryptKey, out iv);
byte[] authKey = AesUtils.CreateKey();
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);
try
{
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("Nonce already seen"));
}
}
public void Can_Encrypt_and_Decrypt_with_AES_bytes()
{
var msg = new HelloSecure {
Name = "World"
};
byte[] cryptKey, iv;
AesUtils.CreateKeyAndIv(out cryptKey, out iv);
var encryptedBytes = AesUtils.Encrypt(msg.ToJson().ToUtf8Bytes(), cryptKey, iv);
var msgBytes = AesUtils.Decrypt(encryptedBytes, cryptKey, iv);
var decryptedMsg = msgBytes.FromUtf8Bytes().FromJson <HelloSecure>();
Assert.That(decryptedMsg.Name, Is.EqualTo(msg.Name));
}
