Added Saving

src/Ryujinx.HLE/HOS/Horizon.cs

@@ -342,6 +342,7 @@ namespace Ryujinx.HLE.HOS
             if (VirtualAmiibo.applicationBytes.Length > 0)
             {
                 VirtualAmiibo.applicationBytes = new byte[0];
+                VirtualAmiibo.inputBin = string.Empty;
             }
             if (NfpDevices[nfpDeviceId].State == NfpDeviceState.SearchingForTag)
             {
@@ -352,6 +353,7 @@ namespace Ryujinx.HLE.HOS
         }
         public void ScanAmiiboFromBin(string path)
         {
+            VirtualAmiibo.inputBin = path;
             if (VirtualAmiibo.applicationBytes.Length > 0)
             {
                 VirtualAmiibo.applicationBytes = new byte[0];

src/Ryujinx.HLE/HOS/Services/Nfc/AmiiboDecryption/AmiiboBinReader.cs

@@ -148,6 +148,72 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
 
             return virtualAmiiboFile;
         }
+        public static bool SaveBinFile(string inputFile, byte[] appData)
+        {
+            Console.WriteLine("Saving bin file.");
+            byte[] readBytes;
+            try
+            {
+                readBytes = File.ReadAllBytes(inputFile);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error reading file: {ex.Message}");
+                return false;
+            }
+            string keyRetailBinPath = GetKeyRetailBinPath();
+            if (string.IsNullOrEmpty(keyRetailBinPath))
+            {
+                Console.WriteLine("Key retail path is empty.");
+                return false;
+            }
+
+            if (appData.Length != 216) // Ensure application area size is valid
+            {
+                Console.WriteLine("Invalid application data length. Expected 216 bytes.");
+                return false;
+            }
+
+            AmiiboDecrypter amiiboDecryptor = new AmiiboDecrypter(keyRetailBinPath);
+            AmiiboDump amiiboDump = amiiboDecryptor.DecryptAmiiboDump(readBytes);
+
+            byte[] oldData = amiiboDump.GetData();
+            if (oldData.Length != 540) // Verify the expected length for NTAG215 tags
+            {
+                Console.WriteLine("Invalid tag data length. Expected 540 bytes.");
+                return false;
+            }
+
+            byte[] newData = new byte[oldData.Length];
+            Array.Copy(oldData, newData, oldData.Length);
+
+            // Replace application area with appData
+            int appAreaOffset = 76 * 4; // Starting page (76) times 4 bytes per page
+            Array.Copy(appData, 0, newData, appAreaOffset, appData.Length);
+
+            AmiiboDump encryptedDump = amiiboDecryptor.EncryptAmiiboDump(newData);
+            byte[] encryptedData = encryptedDump.GetData();
+
+            if (encryptedData == null || encryptedData.Length != readBytes.Length)
+            {
+                Console.WriteLine("Failed to encrypt data correctly.");
+                return false;
+            }
+            inputFile = inputFile.Replace("_modified", string.Empty);
+            // Save the encrypted data to file or return it for saving externally
+            string outputFilePath = Path.Combine(Path.GetDirectoryName(inputFile), Path.GetFileNameWithoutExtension(inputFile) + "_modified.bin");
+            try
+            {
+                File.WriteAllBytes(outputFilePath, encryptedData);
+                Console.WriteLine($"Modified Amiibo data saved to {outputFilePath}.");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error saving file: {ex.Message}");
+                return false;
+            }
+        }
 
         private static void LogDebugData(byte[] uid, byte bcc0, byte bcc1)
         {

src/Ryujinx.HLE/HOS/Services/Nfc/AmiiboDecryption/AmiiboDecrypter.cs

@@ -32,5 +32,16 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
 
             return amiiboDump;
         }
+
+        public AmiiboDump EncryptAmiiboDump(byte[] decryptedDumpData)
+        {
+            // Initialize AmiiboDump with decrypted data
+            AmiiboDump amiiboDump = new AmiiboDump(decryptedDumpData, DataKey, TagKey, isLocked: false);
+
+            // Lock (encrypt) the dump
+            amiiboDump.Lock();
+
+            return amiiboDump;
+        }
     }
 }

src/Ryujinx.HLE/HOS/Services/Nfc/Nfp/VirtualAmiibo.cs

@@ -4,6 +4,7 @@ using Ryujinx.Common.Utilities;
 using Ryujinx.Cpu;
 using Ryujinx.HLE.HOS.Services.Mii;
 using Ryujinx.HLE.HOS.Services.Mii.Types;
+using Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption;
 using Ryujinx.HLE.HOS.Services.Nfc.Nfp.NfpManager;
 using System;
 using System.Collections.Generic;
@@ -15,6 +16,7 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.Nfp
     {
         public static uint _openedApplicationAreaId;
         public static byte[] applicationBytes = new byte[0];
+        public static string inputBin = string.Empty;
         private static readonly AmiiboJsonSerializerContext _serializerContext = AmiiboJsonSerializerContext.Default;
         public static byte[] GenerateUuid(string amiiboId, bool useRandomUuid)
         {
@@ -161,6 +163,11 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.Nfp
 
         public static void SetApplicationArea(string amiiboId, byte[] applicationAreaData)
         {
+            if (inputBin != string.Empty)
+            {
+                AmiiboBinReader.SaveBinFile(inputBin, applicationAreaData);
+                return;
+            }
             VirtualAmiiboFile virtualAmiiboFile = LoadAmiiboFile(amiiboId);
 
             if (virtualAmiiboFile.ApplicationAreas.Exists(item => item.ApplicationAreaId == _openedApplicationAreaId))
@@ -220,6 +227,15 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.Nfp
             JsonHelper.SerializeToFile(filePath, virtualAmiiboFile, _serializerContext.VirtualAmiiboFile);
         }
 
-        public static bool SaveFileExists(VirtualAmiiboFile virtualAmiiboFile) => File.Exists(Path.Join(AppDataManager.BaseDirPath, "system", "amiibo", $"{virtualAmiiboFile.AmiiboId}.json"));
+        public static bool SaveFileExists(VirtualAmiiboFile virtualAmiiboFile)
+        {
+            if (inputBin != string.Empty)
+            {
+                SaveAmiiboFile(virtualAmiiboFile);
+                return true;
+
+            }
+            return File.Exists(Path.Join(AppDataManager.BaseDirPath, "system", "amiibo", $"{virtualAmiiboFile.AmiiboId}.json"));
+        }
     }
 }