Added: DESFire Class V2

NFC/Crypto/AES.cs

@@ -0,0 +1,45 @@
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Engines;
+using Org.BouncyCastle.Crypto.Modes;
+using Org.BouncyCastle.Crypto.Paddings;
+using Org.BouncyCastle.Crypto.Parameters;
+
+namespace NFC.Crypto
+{
+    public class AES
+    {
+        public byte[] Encrypt(byte[] data, byte[] key, byte[] iv)
+        {
+            AesEngine engine = new AesEngine();
+            CbcBlockCipher blockCipher = new CbcBlockCipher(engine);
+            BufferedBlockCipher cipher = new BufferedBlockCipher(blockCipher);
+            KeyParameter keyParam = new KeyParameter(key);
+            ParametersWithIV keyParamWithIV = new ParametersWithIV(keyParam, iv);
+
+            // Encrypt
+            cipher.Init(true, keyParamWithIV);
+            byte[] outputBytes = new byte[cipher.GetOutputSize(data.Length)];
+            int length = cipher.ProcessBytes(data, outputBytes, 0);
+            cipher.DoFinal(outputBytes, length);
+
+            return outputBytes;
+        }
+
+        public byte[] Decrypt(byte[] data, byte[] key, byte[] iv)
+        {
+            AesEngine engine = new AesEngine();
+            CbcBlockCipher blockCipher = new CbcBlockCipher(engine);
+            BufferedBlockCipher cipher = new BufferedBlockCipher(blockCipher);
+            KeyParameter keyParam = new KeyParameter(key);
+            ParametersWithIV keyParamWithIV = new ParametersWithIV(keyParam, iv);
+
+            // Decrypt
+            cipher.Init(false, keyParamWithIV);
+            byte[] outputBytes = new byte[cipher.GetOutputSize(data.Length)];
+            int length = cipher.ProcessBytes(data, outputBytes, 0);
+            cipher.DoFinal(outputBytes, length);
+
+            return outputBytes;
+        }
+    }
+}

NFC/Crypto/CRC16.cs

@@ -0,0 +1,44 @@
+using System;
+
+namespace NFC.Crypto
+{
+    public class CRC16
+    {
+        public byte[] Calculate(byte[] data)
+        {
+            UInt16 crc16 = 0x6363;
+
+            crc16 = Calculate(data, crc16);
+
+            return BitConverter.GetBytes(crc16);
+        }
+
+        public byte[] Calculate(byte[] cmd, byte[] data)
+        {
+            UInt16 crc16 = 0x6363;
+
+            crc16 = Calculate(cmd, crc16);
+            crc16 = Calculate(data, crc16);
+
+            return BitConverter.GetBytes(crc16);
+        }
+
+        public UInt16 Calculate(byte[] data, UInt16 crc16)
+        {
+            for (int i = 0; i < data.Length; i++)
+            {
+                crc16 ^= data[i];
+                for (int b = 0; b < 8; b++)
+                {
+                    bool b_Bit = (crc16 & 0x01) > 0;
+                    crc16 >>= 1;
+                    if (b_Bit)
+                    {
+                        crc16 ^= 0x8408;
+                    }
+                }
+            }
+            return crc16;
+        }
+    }
+}

NFC/Crypto/CRC32.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 
 namespace NFC.Crypto
 {