Rijndael Cryptography

[hamidarr]

hi everybody i have a friend that have a website with asp.net he encrypt data with Rijndael Cryptography and write to database i want in my qt application decrypt data and show the user how can i implement this algorithm in qt. this code is in asp.net that my friend use it to encrypt and decrypt data.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
 
namespace TSecurityWebApp.Classes
{
	public class SecurityClass
	{
		public static readonly byte[] PKey = { 18, 45, 248, 40, 250, 160, 96, 102, 137, 39, 130, 244, 83, 242, 253, 221 };
		public static readonly byte[] PIV = { 200, 193, 57, 174, 121, 152, 246, 218, 171, 208, 106, 150, 93, 221, 160, 140 };
 
		public static string DecodeData(string InputData, byte[] PKey, byte[] PIV)
		{
			string retStr = string.Empty;
			try
			{
				var r = System.Security.Cryptography.Rijndael.Create();
 
				r.KeySize = 128;
				r.BlockSize = 128;
 
				r.Key = PKey;
				r.IV = PIV;
 
				byte[] inpBytes = new byte[InputData.Length / 2];
				for (int i = 0; i < InputData.Length / 2; i++)
					inpBytes[i] = byte.Parse((InputData[(i * 2)].ToString() + InputData[(i * 2 + 1)].ToString()), System.Globalization.NumberStyles.HexNumber);
				byte[] decBytes = r.CreateDecryptor().TransformFinalBlock(inpBytes, 0, inpBytes.Length);
 
				r.Clear();
 
				retStr = System.Text.UnicodeEncoding.Unicode.GetString(decBytes);
			}
			catch { retStr = string.Empty; }
			return retStr;
		}
 
		public static string EncodeData(string InputData, byte[] PKey, byte[] PIV)
		{
			string retStr = string.Empty;
			try
			{
				var r = System.Security.Cryptography.Rijndael.Create();
 
				r.KeySize = 128;
				r.BlockSize = 128;
 
				r.Key = PKey;
				r.IV = PIV;
 
				byte[] inpBytes = System.Text.UnicodeEncoding.Unicode.GetBytes(InputData);
				byte[] encBytes = r.CreateEncryptor().TransformFinalBlock(inpBytes, 0, inpBytes.Length);
 
				r.Clear();
 
				foreach (byte b in encBytes)
					retStr += b.ToString("X2");
			}
			catch { retStr = string.Empty; }
			return retStr;
		}
 
		public static string EncriptConnStr(string ConnStr)
		{
			try
			{
				SqlConnectionStringBuilder connBuilder = new SqlConnectionStringBuilder(ConnStr);
				if (!string.IsNullOrEmpty(connBuilder.Password))
					connBuilder.Password = SecurityClass.EncodeData(connBuilder.Password, SecurityClass.PKey, SecurityClass.PIV);
				ConnStr = connBuilder.ConnectionString;
			}
			catch { ConnStr = string.Empty; }
			return ConnStr;
		}
 
		public static string DecriptConnStr(string EncConnStr)
		{
			string decConnStr = EncConnStr;
			try
			{
				SqlConnectionStringBuilder connBuilder = new SqlConnectionStringBuilder(EncConnStr);
				if (!string.IsNullOrEmpty(connBuilder.Password))
					connBuilder.Password = SecurityClass.DecodeData(connBuilder.Password, SecurityClass.PKey, SecurityClass.PIV);
				decConnStr = connBuilder.ConnectionString;
			}
			catch { decConnStr = EncConnStr; }
			return decConnStr;
		}
	}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;

namespace TSecurityWebApp.Classes
{
	public class SecurityClass
	{
		public static readonly byte[] PKey = { 18, 45, 248, 40, 250, 160, 96, 102, 137, 39, 130, 244, 83, 242, 253, 221 };
		public static readonly byte[] PIV = { 200, 193, 57, 174, 121, 152, 246, 218, 171, 208, 106, 150, 93, 221, 160, 140 };

		public static string DecodeData(string InputData, byte[] PKey, byte[] PIV)
		{
			string retStr = string.Empty;
			try
			{
				var r = System.Security.Cryptography.Rijndael.Create();

				r.KeySize = 128;
				r.BlockSize = 128;

				r.Key = PKey;
				r.IV = PIV;

				byte[] inpBytes = new byte[InputData.Length / 2];
				for (int i = 0; i < InputData.Length / 2; i++)
					inpBytes[i] = byte.Parse((InputData[(i * 2)].ToString() + InputData[(i * 2 + 1)].ToString()), System.Globalization.NumberStyles.HexNumber);
				byte[] decBytes = r.CreateDecryptor().TransformFinalBlock(inpBytes, 0, inpBytes.Length);

				r.Clear();

				retStr = System.Text.UnicodeEncoding.Unicode.GetString(decBytes);
			}
			catch { retStr = string.Empty; }
			return retStr;
		}

		public static string EncodeData(string InputData, byte[] PKey, byte[] PIV)
		{
			string retStr = string.Empty;
			try
			{
				var r = System.Security.Cryptography.Rijndael.Create();

				r.KeySize = 128;
				r.BlockSize = 128;

				r.Key = PKey;
				r.IV = PIV;

				byte[] inpBytes = System.Text.UnicodeEncoding.Unicode.GetBytes(InputData);
				byte[] encBytes = r.CreateEncryptor().TransformFinalBlock(inpBytes, 0, inpBytes.Length);

				r.Clear();

				foreach (byte b in encBytes)
					retStr += b.ToString("X2");
			}
			catch { retStr = string.Empty; }
			return retStr;
		}

		public static string EncriptConnStr(string ConnStr)
		{
			try
			{
				SqlConnectionStringBuilder connBuilder = new SqlConnectionStringBuilder(ConnStr);
				if (!string.IsNullOrEmpty(connBuilder.Password))
					connBuilder.Password = SecurityClass.EncodeData(connBuilder.Password, SecurityClass.PKey, SecurityClass.PIV);
				ConnStr = connBuilder.ConnectionString;
			}
			catch { ConnStr = string.Empty; }
			return ConnStr;
		}

		public static string DecriptConnStr(string EncConnStr)
		{
			string decConnStr = EncConnStr;
			try
			{
				SqlConnectionStringBuilder connBuilder = new SqlConnectionStringBuilder(EncConnStr);
				if (!string.IsNullOrEmpty(connBuilder.Password))
					connBuilder.Password = SecurityClass.DecodeData(connBuilder.Password, SecurityClass.PKey, SecurityClass.PIV);
				decConnStr = connBuilder.ConnectionString;
			}
			catch { decConnStr = EncConnStr; }
			return decConnStr;
		}
	}
}

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[ChrisW67]

Qt has no AES encryption or decryption capability. You can use any third-party library you like. One Qt-like wrapper is QCA, or you could use OpenSSL (libcrypto) directly.