AES 128 Encryption and Random Number generation

Ramesh Kumar Jayaraj

Intellectual 310 points

Other Parts Discussed in Thread: CC2540, CC2640

Hi,

I want to use the AES 128 encryption and decryption algorithm for generation hash key value from BLE stack.

I am using CC 2540 BLE Stack, and in which we have HCIExt_Decrypt command to decrypt the string which is encrypted.

Also, we have the SendCmd available for Decryption for usage.

public bool SendHCIExt(HCICmds.HCIExtCmds.HCIExt_Decrypt cmd)

Similarly, is there any way to encrypt the given string using AES 128 algorithm from CC2540 BLE Stack?

From some reference, i got the below extern functions for Encryption and Random number generation for BLE stack.

extern hciStatus_t HCI_LE_EncryptCmd( uint8 *key, uint8 *plainText );

extern hciStatus_t HCI_LE_RandCmd( void );

Do we have any HCI command or function usage for AES 128 Encryption and Random generation in CC 2540 BLE stack?

Or do we have these functionalities in CC 2640 BLE Stack?

Thanks and Regards,

Ramesh Kumar

over 10 years ago

0 Dhaval V over 10 years ago

Genius 4470 points

I am not sure, but can you use "LL_EXT_Decrypt" and "LL_Encrypt" to decryption and encryption respectively.

0 Zahid Haq over 10 years ago

TI__Mastermind 25035 points

For CC2640, this is possible. Refer to relevant post:
e2e.ti.com/.../1549364

0 Ramesh Kumar Jayaraj over 10 years ago in reply to Zahid Haq

Intellectual 310 points

Thanks for the reply.

Kindly can any one check with TI, whether AES Encryption algorithm is possible for CC2640, the same can be supported for CC2540 right.

Since we have HCI_LE_Encrypt is available with BLE stack, it should be possible to encrypt the given Cipher text.

Using CC2540 USB Dongle and PC Application, I tried to decrypt the given data with Key and stack has responsed with the decrypted string.

But the same way i cannot able to encrypt the given data using LE_Encrypt command. No reponse is available from the BLE stack.

Kindly reply or forward to the concerned person if possible.

Thanks and Regards,
Ramesh Kumar

Bluetooth®︎

Bluetooth forum

AES 128 Encryption and Random Number generation