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src/FrontOffice.Main/Utilities/MobileNumberEncryptor.cs

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+using Microsoft.AspNetCore.DataProtection.KeyManagement;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace FrontOffice.Main.Utilities;
+
+public class MobileNumberEncryptor
+{
+    private readonly string _key;
+    private readonly string _iv;
+    public MobileNumberEncryptor(IConfiguration configuration)
+    {
+        var encryptionSettings = configuration.GetSection("EncryptionSettings").Get<EncryptionSettings>();
+
+        _key = encryptionSettings?.Key ?? throw new ArgumentNullException("Encryption Key not found in configuration");
+        _iv = encryptionSettings?.IV ?? throw new ArgumentNullException("Encryption IV not found in configuration");
+
+        // اعتبارسنجی سایز
+        ValidateKeyAndIV();
+    }
+    public MobileNumberEncryptor(string key, string iv)
+    {
+        _key = key;
+        _iv = iv;
+        ValidateKeyAndIV();
+    }
+    private void ValidateKeyAndIV()
+    {
+        try
+        {
+            byte[] keyBytes = Convert.FromBase64String(_key);
+            byte[] ivBytes = Convert.FromBase64String(_iv);
+
+            if (keyBytes.Length != 32)
+                throw new ArgumentException("Key must be 32 bytes in Base64 format");
+
+            if (ivBytes.Length != 16)
+                throw new ArgumentException("IV must be 16 bytes in Base64 format");
+        }
+        catch (FormatException)
+        {
+            throw new ArgumentException("Key or IV is not valid Base64 string");
+        }
+    }
+
+    public string EncryptMobileNumber(string mobileNumber)
+    {
+        if (string.IsNullOrEmpty(mobileNumber))
+            throw new ArgumentException("Mobile number cannot be null or empty");
+
+        try
+        {
+            byte[] key = Convert.FromBase64String(_key);
+            byte[] iv = Convert.FromBase64String(_iv);
+            byte[] plainTextBytes = Encoding.UTF8.GetBytes(mobileNumber);
+
+            using (Aes aesAlg = Aes.Create())
+            {
+                aesAlg.Key = key;
+                aesAlg.IV = iv;
+                aesAlg.Mode = CipherMode.ECB;
+                aesAlg.Padding = PaddingMode.PKCS7;
+
+                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
+
+                using (MemoryStream msEncrypt = new MemoryStream())
+                {
+                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
+                    {
+                        csEncrypt.Write(plainTextBytes, 0, plainTextBytes.Length);
+                        csEncrypt.FlushFinalBlock();
+
+                        byte[] encryptedBytes = msEncrypt.ToArray();
+                        return Convert.ToBase64String(encryptedBytes);
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            throw new Exception($"Encryption failed: {ex.Message}", ex);
+        }
+    }
+
+    public string DecryptMobileNumber(string encryptedMobileNumber)
+    {
+        if (string.IsNullOrEmpty(encryptedMobileNumber))
+            throw new ArgumentException("Encrypted mobile number cannot be null or empty");
+
+        try
+        {
+            byte[] key = Convert.FromBase64String(_key);
+            byte[] iv = Convert.FromBase64String(_iv);
+            byte[] cipherTextBytes = Convert.FromBase64String(encryptedMobileNumber);
+
+            using (Aes aesAlg = Aes.Create())
+            {
+                aesAlg.Key = key;
+                aesAlg.IV = iv;
+                aesAlg.Mode = CipherMode.ECB;
+                aesAlg.Padding = PaddingMode.PKCS7;
+
+                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
+
+                using (MemoryStream msDecrypt = new MemoryStream(cipherTextBytes))
+                {
+                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
+                    {
+                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
+                        {
+                            return srDecrypt.ReadToEnd();
+                        }
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            throw new Exception($"Decryption failed: {ex.Message}", ex);
+        }
+    }
+}