fix

Author: NonPIayerCharacter

BK7231Flasher/Beken_Crypto.cs

@@ -165,6 +165,7 @@ public static uint RotateLeft(uint value, int bits)
 
 		public static byte[] UnCRC(byte[] bytes)
 		{
+			bytes = MiscUtils.padArray(bytes, 34);
 			var decrc = new List<byte>();
 			int i = 0;
 			for(i = 0; i < bytes.Length; i += 34)
@@ -184,11 +185,10 @@ public static byte[] UnCRC(byte[] bytes)
 
 		public static byte[] CRCBeken(byte[] bytes)
 		{
+			bytes = MiscUtils.padArray(bytes, 32);
 			var crc = new List<byte>();
 			int i = 0;
 			var packet = new byte[34];
-			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);

BK7231Flasher/FormMain.Decryption.cs

@@ -49,6 +49,7 @@ private static string OpenFile(out string safeFileName)
 
 		private bool CheckDecrcLength(byte[] data, int len)
 		{
+			if(data == null) return false;
 			if(data.Length < len)
 			{
 				if(data.Length == 0)
@@ -251,6 +252,7 @@ private void OnBtnEncryptBKNBootloaderClick(object sender, EventArgs e)
 		private void OnBtnEncryptFirmwareClick(object sender, EventArgs e)
 		{
 			var fileName = OpenFile(out var safeFileName);
+			if(fileName == null) return;
 			var data = File.ReadAllBytes(fileName);
 			var uintdata = Utils.U8ToU32(data);
 			var keys = new uint[] { Convert.ToUInt32(numCoeff1.Text, 16), Convert.ToUInt32(numCoeff2.Text, 16), Convert.ToUInt32(numCoeff3.Text, 16), Convert.ToUInt32(numCoeff4.Text, 16) };