First Commit

Apis/ADS.Apis.Gps/Infrastructure/Crypto/LegacyCryptoOptions.cs

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+namespace ADS.Apis.Gps.Infrastructure.Crypto;
+
+public sealed class LegacyCryptoOptions
+{
+    public string Mode { get; set; } = "AES"; // "DES" o "AES"
+    public string Key { get; set; } = "";
+    public string IV { get; set; } = ""; // Base64
+}

Apis/ADS.Apis.Gps/Infrastructure/Crypto/LegacyPasswordEncryptor.cs

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+using System.Security.Cryptography;
+using System.Text;
+using ADS.Apis.Gps.Application.Common.Crypto;
+using Microsoft.Extensions.Options;
+
+namespace ADS.Apis.Gps.Infrastructure.Crypto;
+
+public sealed class LegacyPasswordEncryptor : ILegacyPasswordEncryptor
+{
+    private readonly LegacyCryptoOptions _opt;
+
+    public LegacyPasswordEncryptor(IOptions<LegacyCryptoOptions> opt)
+        => _opt = opt.Value;
+
+    public string Encrypt(string plainText)
+    {
+        if (string.IsNullOrEmpty(plainText)) return string.Empty;
+
+        var mode = (_opt.Mode ?? "AES").Trim().ToUpperInvariant();
+        var iv = Convert.FromBase64String(_opt.IV ?? "");
+
+        return mode switch
+        {
+            "DES" => EncryptDesBase64(plainText, _opt.Key, iv),
+            "AES" => EncryptAesBase64(plainText, _opt.Key, iv),
+            _ => throw new InvalidOperationException($"Unsupported LegacyCrypto.Mode: {_opt.Mode}")
+        };
+    }
+
+    private static string EncryptDesBase64(string plainText, string keySource, byte[] iv8)
+    {
+        if (iv8.Length != 8) throw new ArgumentException("DES IV must be 8 bytes.", nameof(iv8));
+
+        var key8 = Encoding.UTF8.GetBytes((keySource ?? string.Empty).PadRight(8).Substring(0, 8));
+
+        using var des = new DESCryptoServiceProvider
+        {
+            Mode = CipherMode.CBC,
+            Padding = PaddingMode.PKCS7,
+            Key = key8,
+            IV = iv8
+        };
+
+        var input = Encoding.UTF8.GetBytes(plainText);
+        using var encryptor = des.CreateEncryptor(des.Key, des.IV);
+        var cipher = encryptor.TransformFinalBlock(input, 0, input.Length);
+
+        return Convert.ToBase64String(cipher);
+    }
+
+    private static string EncryptAesBase64(string plainText, string keySource, byte[] iv16)
+    {
+        if (iv16.Length != 16) throw new ArgumentException("AES IV must be 16 bytes.", nameof(iv16));
+
+        var key32 = Encoding.UTF8.GetBytes((keySource ?? string.Empty).PadRight(32).Substring(0, 32));
+
+        using var aes = Aes.Create();
+        aes.Mode = CipherMode.CBC;
+        aes.Padding = PaddingMode.PKCS7;
+        aes.Key = key32;
+        aes.IV = iv16;
+
+        var input = Encoding.UTF8.GetBytes(plainText);
+        using var encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
+        var cipher = encryptor.TransformFinalBlock(input, 0, input.Length);
+
+        return Convert.ToBase64String(cipher);
+    }
+}