p5df072ev2 NXP Semiconductors, p5df072ev2 Datasheet - Page 4

• Manufacturer Part Number: p5df072ev2
• Description: Mifare Sam Av1
• Manufacturer: NXP Semiconductors

NXP Semiconductors
P5DF072EV2/T0PD4090_SDS_31
Product short data sheet
PUBLIC
7.4.1 DES and 3DES cryptography
7.4.2 AES cryptography
7.4 Cryptography and key handling
Both DES and 3DES keys consisting of 112 bits are stored in strings of 16 bytes; 3DES
keys consisting of 168 bits are stored in strings of 24 bytes.
AES keys are stored in strings of 16 bytes or 24 bytes depending on whether it is an
AES 128-bit key or an AES 192-bit key.
AES always operates with 16 bytes. Therefore data streams are always padded to lengths
that are multiples of 16 bytes.
All cryptographic operations are done in cipher block chaining mode, which defines the
result of the previous operation to be the init vector of the next cryptographic operation.
For sending data the CBC send mode is applied, for receiving it is always CBC receive
mode.
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 14 June 2010
189731
P5DF072EV2/T0PD4090
MIFARE SAM AV1
© NXP B.V. 2010. All rights reserved.
4 of 22