private T Decrypt <T>(byte[] cipherText)
{
var aes = new AesProvider(this.sessionService.SessionKey);
var decrypted = aes.Decrypt(cipherText);
var json = Encoding.UTF8.GetString(decrypted);
var result = JsonConvert.DeserializeObject <T>(json);
return(result);
}
public async Task InvokeAsync(HttpContext httpContext)
{
if (!httpContext.Request.Headers.ContainsKey(requestKey) || !httpContext.Request.Headers.ContainsKey(clientSecretHeader))
{
await WriteToReponseAsync();
return;
}
var requestKeyHeader = httpContext.Request.Headers[requestKey].ToString();
string clientSecret = httpContext.Request.Headers[clientSecretHeader].ToString();
if (string.IsNullOrEmpty(requestKeyHeader) || string.IsNullOrEmpty(clientSecret))
{
await WriteToReponseAsync();
return;
}
//اگر کلید در کش موجود بود یعنی کاربر از کلید تکراری استفاده کرده است
if (_cache.GetString(requestKeyHeader) != null)
{
await WriteToReponseAsync();
return;
}
var dateTimeNow = DateTime.UtcNow;
var expireTimeFrom = dateTimeNow.AddMinutes(-1).Ticks;
var expireTimeTo = dateTimeNow.Ticks;
string decryptedRequestHeader = AesProvider.Decrypt(requestKeyHeader, clientSecret);
var requestKeyData = System.Text.Json.JsonSerializer.Deserialize <TOTPRequestDto>(decryptedRequestHeader);
if (requestKeyData.DateTimeUtcTicks >= expireTimeFrom && requestKeyData.DateTimeUtcTicks <= expireTimeTo)
{
//ذخیره کلید درخواست در کش برای جلوگیری از استفاده مجدد از کلید
await _cache.SetAsync(requestKeyHeader, Encoding.UTF8.GetBytes("KeyExist"), new DistributedCacheEntryOptions
{
AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(2)
});
await _next(httpContext);
}
else
{
await WriteToReponseAsync();
return;
}
async Task WriteToReponseAsync()
{
httpContext.Response.StatusCode = (int)HttpStatusCode.Forbidden;
await httpContext.Response.WriteAsync("Forbidden: You don't have permission to call this api");
}
}
static void Test(AesProvider aesProvider)
{
var text = Guid.NewGuid().ToString();
var cipherIVPair = aesProvider.Encrypt(text.Bytes());
var bytes = AesIVHandler.Default.Combine(cipherIVPair);
var _cipherIVPair = AesIVHandler.Default.Separate(bytes);
var source = aesProvider.Decrypt(_cipherIVPair).String();
Assert.Equal(text, source);
}
static void Test(AesProvider aesProvider)
{
var text = Guid.NewGuid().ToString();
var cipher = aesProvider.Encrypt(text.Bytes());
var bytes = cipher.ToBytes();
var _cipher = new AesCipher().FromBytes(bytes);
var source = aesProvider.Decrypt(_cipher).String();
Assert.Equal(text, source);
}
public void GoodKeyAndIVTest(int keyLen, int ivLen)
{
AesProvider aes = new AesProvider();
ShaProvider sha = new ShaProvider();
byte[] plain = new byte[] { 0x96, 0x0D, 0x38, 0x4E, 0xE8, 0xE2, 0xE4, 0x7C, 0x32, 0x7D, 0xDB, 0x28, 0x50, 0x15, 0x23, 0x5E, 0xC1, 0xD8, 0x7A, 0x05, 0x19, 0x62, 0x63, 0x23, 0x1F, 0x27, 0x9C, 0x3B, 0xA9, 0x0E, 0x81, 0xB6 };
string plainHex = plain.ToHex();
byte[] encrypted = aes.Encrypt(plain);
byte[] decrypted = aes.Decrypt(encrypted);
Assert.Equal(plainHex, decrypted.ToHex());
}
public void EncryptDecryptByteArrayTest(AesKeySize keySize)
{
byte[] input = DataHelper.RandomBytes(20);
AesKeyInfo encryptionKeyInfo = AesProvider.GenerateKey(keySize);
var provider = new AesProvider(encryptionKeyInfo.Key);
byte[] encryptedData = provider.Encrypt(input, b => b, StandardConverters.StreamToBytes);
Assert.NotNull(encryptedData);
byte[] decryptedData = provider.Decrypt(encryptedData, b => b, StandardConverters.StreamToBytes);
Assert.NotNull(decryptedData);
Assert.Equal(input, decryptedData);
}
public void Aes_Encryption_Decryption_Success(string testPhrase, int keySize)
{
// ARRANGE
var aesCrypto = new AesProvider();
var key = aesCrypto.GenerateKey(keySize);
var IV = aesCrypto.GenerateInitializationVector();
// ACT
var encrypted = aesCrypto.Encrypt(testPhrase, key, IV, CipherMode.CBC);
var decrypted = aesCrypto.Decrypt(encrypted, key, IV, CipherMode.CBC);
// ASSERT
Assert.AreEqual(testPhrase, decrypted);
}
public async Task RefreshSessionKey()
{
var aes = new AesProvider(this.SessionKey);
var secret = aes.Encrypt(this.clientRandom);
string url = $"api/sessions/{this.SessionId}/refresh";
var result = await this.http.PostAsync(Environment.ApplicationUrl + url, new StringContent(JsonConvert.SerializeObject(secret), Encoding.UTF8, "application/json"));
var obj = await result.Content.ReadAsStringAsync();
var refreshedKey = JsonConvert.DeserializeObject <byte[]>(obj);
this.SessionKey = aes.Decrypt(refreshedKey);
}
public void EncryptDecryptStringTest(AesKeySize keySize)
{
string input = StringHelper.RandomString(20);
AesKeyInfo encryptionKeyInfo = AesProvider.GenerateKey(keySize);
var provider = new AesProvider(encryptionKeyInfo.Key);
string encryptedData = provider.Encrypt(input);
Assert.NotNull(encryptedData);
string decryptedData = provider.Decrypt(encryptedData);
Assert.NotNull(decryptedData);
Assert.Equal(input, decryptedData);
}
public void EncryptDecryptTest(string hexKey, string hexIv, string plainText)
{
byte[] key = hexKey.FromHex();
byte[] iv = hexIv.FromHex();
byte[] plainBytes = plainText.FromHex();
AesProvider aes = new AesProvider(key, iv);
byte[] encrptedBytes = aes.Encrypt(plainBytes);
byte[] decryptedBytes = aes.Decrypt(encrptedBytes);
string encryptedHex = encrptedBytes.ToHex();
string decryptedHex = decryptedBytes.ToHex();
Assert.Equal(plainText, decryptedHex, true);
}
public void EncryptDecryptStringTest(AesKeySize keySize)
{
string input = DataHelper.RandomString(20);
AesKeyInfo encryptionKeyInfo = AesProvider.GenerateKey(keySize);
var provider = new AesProvider(encryptionKeyInfo.Key);
string encryptedData = provider.Encrypt(input, Encoding.UTF8.GetBytes, StandardConverters.StreamToBase64String);
Assert.NotNull(encryptedData);
string decryptedData = provider.Decrypt(encryptedData, Convert.FromBase64String, StandardConverters.StreamToString);
Assert.NotNull(decryptedData);
Assert.Equal(input, decryptedData);
}
private async Task <T> GetResponseResultFromServer <T>(HttpResponseMessage response)
{
bool hasError = response.IsSuccessStatusCode;
string json;
if (!hasError)
{
var byteResult = await response.Content.ReadAsByteArrayAsync();
var aes = new AesProvider(this.sessionService.SessionKey);
var decryptedByteResult = aes.Decrypt(byteResult);
json = Encoding.UTF8.GetString(decryptedByteResult);
return(JsonConvert.DeserializeObject <T>(json));
}
else
{
var responseMessage = await response.Content.ReadAsStringAsync();
var errorResponse = JsonConvert.DeserializeObject <ErrorResponse>(responseMessage);
var error = errorResponse.ErrorMessage;
switch (error)
{
case "Session key expired.":
{
await this.sessionService.RefreshSessionKey();
throw new Exception("Refresh sessionKey.");
}
case "Invalid token.":
{
throw new Exception("Refresh access token.");
}
default:
{
throw new Exception(error);
}
}
}
}
/// <summary>
/// 测试操作的可用性
/// </summary>
/// <remarks>
/// 测试完成后，需删除方法内部所有内容, 并返回false
/// </remarks>
/// <returns>是否正在测试，true: 正在测试, false: 不在测试</returns>
private static bool AesTest()
{
Rsa();
return(true);
var text = "Hello World!";
var encryptKey = Guid.NewGuid().ToString("N"); //"d9b46c3513654f66bea91f7e81009ce9";
var key = encryptKey.ToBytes();
//key = Encoding.UTF8.GetBytes(encryptKey);
var iv = new byte[16];
var enc = AesProvider.Encrypt(text, key, iv);
var dec = AesProvider.Decrypt(enc, key, iv);
Console.WriteLine($"加密前：{text}");
Console.WriteLine($"加密后：{enc}");
Console.WriteLine($" key：{BitConverter.ToString(key).Replace("-", "")}");
Console.WriteLine($" iv：{BitConverter.ToString(iv).Replace("-", "")}");
return(true);
}
public static TemporaryTicket Parse(AesProvider aesProvider, string ciphertext)
{
var json = aesProvider.Decrypt(ciphertext.Flow(BytesFlow.FromUrlSafeBase64)).String();
return(JsonConvert.DeserializeObject <TemporaryTicket>(json));
}
