Technical Manual

East Wind Technologies, Inc.

3.7 DESFire Card Commands

We are here to provide a separate operation for DESFire card. DESFire card authentication

and communication use DES encryption algorithm. The encryption of communication between

EWTJ680H-H-I and DESFire cards is set by users. If the user sets the RF communication process

is encrypted then the card data security is extremely high.

Use the following command allows the user to quickly start DESFire card R&D works. But

for advanced user, also could use APDU to implement the card.

3.7.1 DESFire Prepare Commands

3.7.1.1 DESFire Request

DESFire card request, Please reference ISO14443 TYPE A Request.

3.7.1.2 DESFire RATS

DESFire card RATS, Please reference: ISO14443-4 TYPE-A card reset (RATS).

3.7.1.3 DESFire Request and RATS

This command support DESFire Request and RATS. Please reference: Card Request

according to EMV and PBOC.

3.7.1.4 DESFire Authenticate

Function: Triple mutual authentication between DESFire and PCD. The authentication key

number could be master Key or any other key.

The command means the host sent the key to the module. The module will process the

authentication and send back results.

Advanced users could control the authentication process by themselves to improve security.

We provide additional authentication interface. For details, please reference: 0x8E: DESFire

Authenticate first step Get ekNo (RndB) and 0x8F: DESFire Authenticate second step get ekNo

(RndA’). For all encryption and decryption methods related to DESFire refer to

datasheet please. We also provide a tool to calculate the encryption and decryption. The source

code of the tool is helpfull for users, if need assistance, please contact us.

Host sends:

Frame

0x90

KeyNo

Key

Checksum

KeyNo: 1 byte, the number of the key

Key: 16 bytes.

Success:

Frame

0x90

Status

SenssionKey

Checksum

Status: status code returned from the card, the communication between the card and

module is successful, but may not meet the conditions for the implementation.

Please reference: DESFire Returned State Code.