XTEA-Cipher library for Arduino

XTEA cipher library with MAC code calculation support for Arduino environment. Supported encryption modes are: ECB, CFB and OCB and for generating message authentication codes is CFB-MAC. 'C' code of this library was optimized for lowest possible use of program memory. Contrary to reference implementation, base data type is uint8_t[] instead of uint32_t.

Constants

Configure library settings in file xtea.h, or better in your sketch, by adding directive #define XTEA_ROUNDS n or/and #define XTEA_MAC_ROUNDS n before directive including this cipher library e.g.:

...
#define XTEA_ROUNDS 48
#define XTEA_MAC_ROUNDS 24

#include "XTEA-Cipher.h"
...

XTEA_ROUNDS

actual number of Feistel rounds during cipher is 2 * XTEA_ROUNDS

[default value is 32]
XTEA_MAC_ROUNDS

actual number of Feistel rounds during MAC calculation is 2 * XTEA_MAC_ROUNDS

[default value is 32]

known attack is on 36 Feistel rounds (18 XTEA_ROUNDS or XTEA_MAC_ROUNDS)
XTEA_BLOCK_SIZE

data block size = 64-bit [8 bytes]

[Do NOT change its value]
XTEA_IV_SIZE

size of initialization vector [IV] (a.k.a. NONCE) = 64-bit [8 bytes]

[Do NOT change its value]
XTEA_KEY_SIZE

key size = 128-bit [16 bytes]

[Do NOT change its value]

Library Content

Read the source code for details.

Examples

XTEA Test 'C' style

Sketch shows examples of calling 'C' code functions and validating them with test vectors.
XTEA Test Arduino style

This sketch shows examples of calling methods of a c++ class and validating them with test vectors.

Installation Guide

Arduino IDE - Additional libraries installation guide.

Reporting bugs

Create an issue on GitHub.

License

Source: https://github.com/michpro/XTEA-Cipher

This project is released under MIT License.

Support

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