partitions

Author: NonPIayerCharacter

BK7231Flasher/Beken_Crypto.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.InteropServices;
 
 namespace BK7231Flasher
 {
@@ -157,13 +158,16 @@ public static uint RotateLeft(uint value, int bits)
 		{
 			0x1F08, // Common Beken bootloaders, 1.0.8, 1.0.13 etc.
 			0x48,   // Tuya 1.0.1 N or 1.0.5 T
+			//0x20F8, // Tuya_A9_Cam_SC-10024_V1.0.0_(VGA卡片机-schemaID-000003uanz)_keyph8vwhadwsx3a_u0kmecmr7j8roazz_NEO_SPI_1.0.4.bin
 		};
 
+		internal static uint FAL_PART_MAGIC_WORD = 0x45503130;
+
 		public static byte[] UnCRC(byte[] bytes)
 		{
 			var decrc = new List<byte>();
 			int i = 0;
-			for(i = 0; i < bytes.Length - 34; i += 34)
+			for(i = 0; i < bytes.Length; i += 34)
 			{
 				var packet = new byte[32];
 				Array.Copy(bytes, i, packet, 0, 32);
@@ -183,21 +187,16 @@ public static byte[] CRCBeken(byte[] bytes)
 			var crc = new List<byte>();
 			int i = 0;
 			var packet = new byte[34];
-			for(i = 0; i < bytes.Length - 32; i += 32)
+			for(int j = 0; j < packet.Length; j++)
+				packet[j] = 0xFF;
+			for(i = 0; i < bytes.Length; i += 32)
 			{
 				Array.Copy(bytes, i, packet, 0, 32);
 				var computedcrc = CRC16.Compute(CRC16Type.CMS, packet, 0, 32);
 				packet[32] = (byte)(computedcrc >> 8);
 				packet[33] = (byte)computedcrc;
 				crc.AddRange(packet);
 			}
-			for(int j = 0; j < packet.Length; j++)
-				packet[j] = 0xFF;
-			Array.Copy(bytes, i, packet, 0, bytes.Length - i);
-			var finalcrc = CRC16.Compute(CRC16Type.CMS, packet);
-			packet[32] = (byte)(finalcrc >> 8);
-			packet[33] = (byte)finalcrc;
-			crc.AddRange(packet);
 			return crc.ToArray();
 		}
 
@@ -261,6 +260,25 @@ public static byte[] EncryptDecryptBekenFW(uint[] keys, uint[] data, uint startA
 			}
 			return U32ToU8(crypted.ToArray());
 		}
+
+		public static unsafe FALPartition64 BytesToFAL64(byte[] data)
+		{
+			fixed(byte* pdata = data)
+			{
+				return Marshal.PtrToStructure<FALPartition64>((IntPtr)pdata);
+			}
+		}
+
+		public static byte[] FAL64ToBytes(FALPartition64 data)
+		{
+			var num = Marshal.SizeOf(data);
+			var ptr = Marshal.AllocHGlobal(num);
+			Marshal.StructureToPtr(data, ptr, false);
+			var array = new byte[num];
+			Marshal.Copy(ptr, array, 0, num);
+			Marshal.FreeHGlobal(ptr);
+			return array;
+		}
 	}
 
 	// vibe-coded
@@ -469,5 +487,18 @@ public uint EncryptU32(uint addr, uint data)
 			uint pnout = pn32_v ^ ((pn15_v << 16) | (pn16_v & 0xFFFF)) ^ random;
 			return data ^ pnout;
 		}
-	}
+	};
+
+	[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
+	public struct FALPartition64
+	{
+		public uint magic_word;
+		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 24)]
+		public string name;
+		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 24)]
+		public string flash_name;
+		public uint offset;
+		public uint len;
+		public uint crc32;
+	};
 }