Make sure your Internet is connected properly, ensuring that the Ethernet cable is going from the modem to the router and that there is an available wireless connection for connected devices. Luckily, this is not an overly difficult task and certainly not as frustrating as, say, learning how to disable IPV6 on a router. The result of the previous process will be the input of the last encryption.īyte encResult = AESEncrypt(key, new byte, data) Īrray.Copy(encResult, encResult.Length - HashValue.Length, HashValue, 0, HashValue.When you revert your router to its default settings, the MAC address will also reset to the original setting. the last block shall be exclusive-OR'ed with K1 before processingįor (int j = 0 j (padding.AsEnumerable()).ToArray() įor (int j = 0 j < SecondSubkey.Length j++)ĭata ^= SecondSubkey If the size of the input message block is equal to a positive multiple of the block size (namely, 128 bits), SecondSubkey ^= 0x87 // Otherwise, K2 is the exclusive-OR of const_Rb and the left-shift of K1 by 1 bit. step 3, K2 is derived through the following operation:īyte SecondSubkey = Rol(FirstSubkey) // If the most significant bit of K1 is equal to 0, K2 is the left-shift of K1 by 1 bit. step 2, K1 is derived through the following operation:īyte FirstSubkey = Rol(L) //If the most significant bit of L is equal to 0, K1 is the left-shift of L by 1 bit.įirstSubkey ^= 0x87 // Otherwise, K1 is the exclusive-OR of const_Rb and the left-shift of L by 1 bit. step 1, AES-128 with key K is applied to an all-zero input block.īyte L = AESEncrypt(key, new byte, new byte) I commented the logic from the RFC for easier understanding.
Now just the implementation of the algorithm in RFC4493 remains. Using (CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(key, iv), CryptoStreamMode.Write))Īnd something to shift arrays left by one bit: byte Rol(byte b) Using (MemoryStream ms = new MemoryStream())ĪesCryptoServiceProvider aes = new AesCryptoServiceProvider() The algorithm is described well in RFC4493, but I will include some code samples here for reference.įor this, you will need the AESEncrypt function, which you can write using dotNet AesCryptoServiceProvider: byte AESEncrypt(byte key, byte iv, byte data) First you need to derive two subkeys from your AES key.
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