23 Mayıs 2022
Python PyJWT Equivelent in C#
31 Mart 2022
24 Mart 2022
SignedString Sınıfı
Dışarıya açık dosya paylaşmada URL i zaman bazlı kısıtlamak için oluşturulmuş kod parçaları.
EncryptTool.cs
using System;
using System.Security.Cryptography;
using System.Text;
namespace SampleSigner
{
public static class EncryptTool
{
public static byte[] EncryptSha5126(string plainText)
{
if (string.IsNullOrEmpty(plainText))
{
throw new ArgumentNullException(nameof(plainText));
}
using (var sha = SHA512.Create())
return sha.ComputeHash(Encoding.UTF8.GetBytes(plainText));
}
/// <summary>
///
/// </summary>
/// <param name="plainText"> Not Null</param>
/// <param name="key">byte[64] random bytes</param>
/// <returns></returns>
public static byte[] HmacSha256(string plainText, byte[] key)
{
if (key == null)
throw new ArgumentNullException(nameof(key));
if (key.Length != 64)
throw new ArgumentException("key.length must be 64");
if (string.IsNullOrEmpty(plainText))
throw new ArgumentNullException(nameof(plainText));
using (HMACSHA256 hmac = new HMACSHA256(key))
{
return hmac.ComputeHash(Encoding.UTF8.GetBytes(plainText));
}
}
}
}
30 Aralık 2021
HTML Loader Vanilla JS
//amagiloader.js
const AmagiLoader = {
__loader: null,
show: function () {
if (this.__loader == null) {
var divContainer = document.createElement('div');
divContainer.style.position = 'absolute';
divContainer.style.left = '0';
divContainer.style.top = '0';
divContainer.style.width = '100vw';
divContainer.style.height = '100vh';
divContainer.style.backgroundColor = 'rgba(250, 250, 250, 0.80)';
var div = document.createElement('div');
div.style.position = 'absolute';
div.style.left = '50%';
div.style.top = '50%';
div.style.zIndex = '9999';
div.style.height = '64px';
div.style.width = '64px';
div.style.margin = '-76px 0 0 -76px';
div.style.border = '8px solid #e1e1e1';
div.style.borderRadius = '50%';
div.style.borderTop = '8px solid #F36E21';
div.animate([
{ transform: 'rotate(0deg)' },
{ transform: 'rotate(360deg)' }
], {
duration: 2000,
iterations: Infinity
});
divContainer.appendChild(div);
this.__loader = divContainer
document.body.appendChild(this.__loader);
}
this.__loader.style.display="";
},
hide: function(){
if(this.__loader!=null)
{
this.__loader.style.display="none";
}
}
}
Usage //index.html
<html>
<head></head>
<body>
<p>asdsadasd
asdsadasdd
asdasdasd</p>
<script src="amagiloader.js"></script>
<script>
AmagiLoader.show();
setTimeout(() => {
AmagiLoader.hide();
}, 3000);
</script>
</body>
</html>
22 Kasım 2021
PostgreSQL Sequence Set
ERROR: duplicate key value violates unique constraint "pkey"
DETAIL: Key (id)=(1503) already exists. SQL state: 23505
SELECT MAX(the_primary_key) FROM the_table;
SELECT nextval('the_primary_key_sequence');Get Sequence Name
select pg_get_serial_sequence('tableName','columnName')
SELECT setval('the_primary_key_sequence', (SELECT MAX(the_primary_key) FROM the_table)+1);
VEYASELECT setval(pg_get_serial_sequence('tableName','columnName'), (SELECT MAX(columnName) FROM tableName)+1);
5 Kasım 2021
PHP - .NET Uyumlu AES Şifreleme
C#
using System.Security.Cryptography;
using System.Text;
namespace ConsoleApp16
{
public class Program
{
public static void Main()
{
var plain = "Lorem Ipsum";
var encryptSettings = new EncryptSettings();
var encryptTools = new EncryptTools(encryptSettings);
var encrypted = encryptTools.AesEncrypt(plain);
Console.WriteLine("Encrypted");
Console.WriteLine(encrypted);
Console.WriteLine();
Console.WriteLine("Decrypted");
var text = encryptTools.AesDecrypt(encrypted);
Console.WriteLine(text);
}
}
public class EncryptSettings
{
public string Key { get; set; }
public EncryptSettings()
{
Key = "passwordstring";
}
}
public class EncryptTools
{
private readonly EncryptSettings encryptSettings;
public EncryptTools(EncryptSettings encryptSettings)
{
this.encryptSettings = encryptSettings;
}
private byte[] key => Sha256Byte(encryptSettings.Key);
private byte[] iv => new byte[16] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
public string AesEncrypt(string plainText)
{
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (key == null || key.Length <= 0)
throw new ArgumentNullException("Key");
if (iv == null || iv.Length <= 0)
throw new ArgumentNullException("IV");
byte[] encrypted;
using (var aes = Aes.Create())
{
aes.Mode = CipherMode.CBC;
aes.Key = key;
aes.IV = iv;
using (var ms = new MemoryStream())
{
using (ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV))
using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
using (StreamWriter swEncrypt = new StreamWriter(cs))
{
swEncrypt.Write(plainText);
}
encrypted = ms.ToArray();
}
}
return Convert.ToBase64String(encrypted);
}
public string AesDecrypt(string encryptedText)
{
var cipherText = Convert.FromBase64String(encryptedText);
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (key == null || key.Length <= 0)
throw new ArgumentNullException("Key");
if (iv == null || iv.Length <= 0)
throw new ArgumentNullException("IV");
string plaintext = null;
using (Aes aes = Aes.Create())
{
aes.Mode = CipherMode.CBC;
aes.Key = key;
aes.IV = iv;
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
using (ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV))
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
return plaintext;
}
public byte[] Sha256Byte(string plainText)
{
byte[] bytes = null;
using (SHA256 sha256Hash = SHA256.Create())
{
bytes = sha256Hash.ComputeHash(Encoding.ASCII.GetBytes(plainText));
}
return bytes;
}
}
}
14 Ekim 2021
6 Karakterli Unique Key Üretme
using System;
using System.Collections.Generic;using System.Text;
namespace ConsoleApp14{ class Program { static void Main(string[] args) { var generatedKeys = new List<string>(); for (int i = 0; i < 100000; i++) { var key = KeyGenerator.Generate(i); if (generatedKeys.Contains(key)) throw new Exception("Tekrar eden numaralar var"); Console.WriteLine(key); generatedKeys.Add(key); } } }
public static class KeyGenerator { // chars count must be prime number // (mine are 31 i also shuffled them you can re shuffle your letters) private static readonly char[] chars = { 'C', 'V', 'M', 'J', '4', 'E', 'Y','L','R','N','9','5','Z','3','X', 'D','8','G','T','6','K','W','P','B','S','U','F','H','A','2','7' }; private static int Mod(int a, int b) => ((a % b) + b) % b;
/// <summary> /// Generates Unique 6 Character Key By Id /// </summary> /// <param name="index"> Min 0 Max 887,503,680</param> /// <returns></returns> public static string Generate(int index) { // I am calculating 6 digit which means 31^6 = 887503681 possible number // I multiplied with 2 different very big prime numbers to prevent similar generated keys var number = Mod((index * 8969 * 10457), 887503681); var sb = new StringBuilder(); while (number > 30) { var letter = chars[(number % 31)]; sb.Append(letter); number = number / 31; } sb.Append(chars[number]); // if it's shorter than 6 character we add last character example (1 =>001) while (sb.Length < 6) { sb.Insert(0, chars[30]); }
return sb.ToString(); } } }
SQL User Defined Function
create function [dbo].[udf_GenerateSixCharacterKey] (@index int)returns varchar(6) asbegin declare @a int, @b int set @a = @index * 8969 * 10457 set @b = 887503681
declare @number int set @number = ((@a % @b) + @b) % @b
declare @chars varchar(31) set @chars = 'CVMJ4EYLRN95Z3XD8GT6KWPBSUFHA27'
declare @key varchar(6) set @key = ''
while @number > 30 begin set @key = @key + substring(@chars, (@number % 31) + 1, 1) set @number = @number / 31 end
set @key = @key + substring(@chars, @number + 1, 1)
while len(@key) < 6 begin set @key = substring(@chars, 31, 1) + @key end
return @key
end
2 Eylül 2021
AES Encryption Quick Code
using System;using System.Collections.Generic;using System.IO;using System.Security.Cryptography;using System.Text;
namespace AesSample{ class Program { static void Main(string[] args) { //appsettings üzerinden okunduğunu varsayalım. var encryptSettings = new EncryptSettings() { IV = "LoremIpsum", Key = "DolorSitAmet", };
IEncryptTools encryptTools = new EncryptTools(encryptSettings);
var sampleText = "Knowing is not enough; we must apply. Willing is not enough; we must do";
var encrypted = encryptTools.AesEncrypt(sampleText);
Console.WriteLine("Encrypted:"); Console.WriteLine(encrypted); Console.WriteLine();
var decrypted = encryptTools.AesDecrypt(encrypted); Console.WriteLine("Decrypted"); Console.WriteLine(decrypted);
} }
public interface IEncryptTools { string AesEncrypt(string plainText); string AesDecrypt(string encryptedText); byte[] Sha256Byte(string plainText); string Sha256String(string plainText); string Sha256String(byte[] bytes); }
public class EncryptSettings { public string Key { get; set; } public string IV { get; set; }
}
public class EncryptTools : IEncryptTools { private readonly EncryptSettings encryptSettings;
public EncryptTools(EncryptSettings encryptSettings) { this.encryptSettings = encryptSettings; }
private byte[] key => Sha256Byte(encryptSettings.Key); private byte[] iv => new List<byte>(Sha256Byte(encryptSettings.IV)) .GetRange(0, 16).ToArray(); public string AesEncrypt(string plainText) { if (plainText == null || plainText.Length <= 0) throw new ArgumentNullException("plainText"); if (key == null || key.Length <= 0) throw new ArgumentNullException("Key"); if (iv == null || iv.Length <= 0) throw new ArgumentNullException("IV"); byte[] encrypted;
using (var aes = Aes.Create()) { aes.Key = key; aes.IV = iv;
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
using (var ms = new MemoryStream()) { using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write)) { using (StreamWriter swEncrypt = new StreamWriter(cs)) { swEncrypt.Write(plainText); } encrypted = ms.ToArray(); } } } return Convert.ToBase64String(encrypted); }
public string AesDecrypt(string encryptedText) { var cipherText = Convert.FromBase64String(encryptedText);
if (cipherText == null || cipherText.Length <= 0) throw new ArgumentNullException("cipherText"); if (key == null || key.Length <= 0) throw new ArgumentNullException("Key"); if (iv == null || iv.Length <= 0) throw new ArgumentNullException("IV");
string plaintext = null;
using (Aes aesAlg = Aes.Create()) { aesAlg.Key = key; aesAlg.IV = iv;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(cipherText)) { using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) { using (StreamReader srDecrypt = new StreamReader(csDecrypt)) { plaintext = srDecrypt.ReadToEnd(); } } } }
return plaintext; }
public byte[] Sha256Byte(string plainText) { byte[] bytes = null; using (SHA256 sha256Hash = SHA256.Create()) { bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(plainText)); } return bytes; }
public string Sha256String(byte[] bytes) { var builder = new StringBuilder(); for (int i = 0; i < bytes.Length; i++) { builder.Append(bytes[i].ToString("x2")); } return builder.ToString(); }
public string Sha256String(string plainText) { var bytes = Sha256Byte(plainText); return Sha256String(bytes); } }}
23 Ağustos 2021
ASP.NET Core Middleware Response Body Değiştirme
using Sample.Settings;
using Microsoft.AspNetCore.Http;
using System.IO;
using System.Threading.Tasks;
namespace Sample.Middlewares
{
public class ContentModifyMiddleware
{
private readonly RequestDelegate next;
private readonly MySettings mySettings;
public ContentModifyMiddleware(RequestDelegate next,
MySettings mySettings)
{
this.next = next;
this.mySettings = mySettings;
}
public async Task Invoke(HttpContext context)
{
// Başlangıç: Hangi Koşullarda Değiştireceğim (Opsiyonel)
var modifyBody = false;
object controllerName = null;
modifyBody = (context.Request.RouteValues != null
&& context.Request.RouteValues.TryGetValue("controller", out controllerName)
&& mySettings.ReplaceTexts != null
&& mySettings.ReplaceTexts.Count > 0);
modifyBody &= (controllerName != null && controllerName.ToString() == "Home");
// Bitiş: Hangi Koşullarda Değiştireceğim (Opsiyonel)
// Başlangıç: İçerik Değiştirilsin
if (modifyBody)
{
// Orjinal Body Yedekle
var originalBody = context.Response.Body;
// Değişikliklerin Yapılacağı Yeni Body
var newBody = new MemoryStream();
context.Response.Body = newBody;
// Response'u al
await next(context);
// Responsu string olarak oku
newBody.Position = 0;
var newContent = await new StreamReader(newBody).ReadToEndAsync();
// Başlangıç: Response Üzerinde Değişiklikeri Yap
// (Replace alanlarını appsettings.json dan okuyorum - siz gömülü kod kullanabilirsiniz.)
foreach (var item in mySettings.ReplaceTexts)
{
newContent = newContent.Replace(item.Old, item.New);
}
// Başlangıç: Response Üzerinde Değişiklikeri Bitiş
//String üzerinde yapılan değişiklikler tekrar stream'a dönüştürülüyor. Ve değiştirilmiş stream original body ile değiştiriliyor.
using (var stream = new MemoryStream())
{
var writer = new StreamWriter(stream);
writer.Write(newContent);
writer.Flush();
stream.Position = 0;
await stream.CopyToAsync(originalBody);
}
newBody.DisposeAsync();
context.Response.Body = originalBody;
}
// Bitiş: İçerik Değiştirilsin
// Başlangıç: İçerik Değiştirilmeden Geç
else
{
await next(context);
}
// Bitiş: İçerik Değiştirilmeden Geç
}
}
}
26 Mayıs 2021
MVC JQuery Validate Unobtrusive Boostrap Class
<script src="jquery.js"></script>
<script src="jquery.validate.js"></script>
<script src="jquery.validate.min.js"></script>
<script>
var validationSettings = {
validClass: "is-valid",
errorClass: "is-invalid"
};
$.validator.setDefaults(validationSettings);
$.validator.unobtrusive.options = validationSettings;
</script>