diff --git a/core/dev/cc2420-aes.c b/core/dev/cc2420-aes.c new file mode 100644 index 000000000..876632d58 --- /dev/null +++ b/core/dev/cc2420-aes.c @@ -0,0 +1,105 @@ +/* + * Copyright (c) 2008, Swedish Institute of Computer Science. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * This file is part of the Contiki operating system. + * + * $Id: cc2420-aes.c,v 1.1 2008/07/02 08:46:13 adamdunkels Exp $ + */ + +/** + * \file + * AES encryption/decryption functions. + * \author + * Adam Dunkels + */ + +#include "contiki.h" +#include "dev/cc2420-aes.h" +#include "dev/cc2420_const.h" +#include "dev/spi.h" + + +#define KEYLEN 16 +#define MAX_DATALEN 16 + +#define MIN(a,b) ((a) < (b)? (a): (b)) + +/*---------------------------------------------------------------------------*/ +void +cc2420_aes_set_key(uint8_t *key, int index) +{ + uint16_t f; + + switch(index) { + case 0: + FASTSPI_WRITE_RAM_LE(key, CC2420RAM_KEY0, KEYLEN, f); + break; + case 1: + FASTSPI_WRITE_RAM_LE(key, CC2420RAM_KEY0, KEYLEN, f); + break; + } +} +/*---------------------------------------------------------------------------*/ +/* Encrypt at most 16 bytes of data. */ +static void +cipher16(uint8_t *data, int len) +{ + uint16_t f; + + len = MIN(len, MAX_DATALEN); + + FASTSPI_WRITE_RAM_LE(data, CC2420RAM_SABUF, len, f); + FASTSPI_STROBE(CC2420_SAES); + FASTSPI_READ_RAM_LE(data, CC2420RAM_SABUF, len, f); +} +/*---------------------------------------------------------------------------*/ +void +cc2420_aes_cihper(uint8_t *data, int len, int key_index) +{ + int i; + uint16_t secctrl0; + + FASTSPI_GETREG(CC2420_SECCTRL0, secctrl0); + + secctrl0 &= ~(CC2420_SECCTRL0_SAKEYSEL0 | CC2420_SECCTRL0_SAKEYSEL1); + + switch(key_index) { + case 0: + secctrl0 |= CC2420_SECCTRL0_SAKEYSEL0; + break; + case 1: + secctrl0 |= CC2420_SECCTRL0_SAKEYSEL1; + break; + } + FASTSPI_SETREG(CC2420_SECCTRL0, secctrl0); + + for(i = 0; i < len; i = i + MAX_DATALEN) { + cipher16(data + i, MIN(len - i, MAX_DATALEN)); + } +} +/*---------------------------------------------------------------------------*/ diff --git a/core/dev/cc2420-aes.h b/core/dev/cc2420-aes.h new file mode 100644 index 000000000..002fdec84 --- /dev/null +++ b/core/dev/cc2420-aes.h @@ -0,0 +1,76 @@ +/* + * Copyright (c) 2008, Swedish Institute of Computer Science. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * This file is part of the Contiki operating system. + * + * $Id: cc2420-aes.h,v 1.1 2008/07/02 08:46:13 adamdunkels Exp $ + */ + +/** + * \file + * Interface to the CC2420 AES encryption/decryption functions + * \author + * Adam Dunkels + */ + +#ifndef __CC2420_AES_H__ +#define __CC2420_AES_H__ + +/** + * \brief Setup an AES key + * \param key A pointer to a 16-byte AES key + * \param index The key index: either 0 or 1. + * + * This function sets up an AES key with the CC2420 + * chip. The AES key can later be used with the + * cc2420_aes_cipher() function to encrypt or decrypt + * data. + * + * The CC2420 can store two separate keys in its + * memory. The keys are indexed as 0 or 1 and the key + * index is given by the 'index' parameter. + * + */ +void cc2420_aes_set_key(uint8_t *key, int index); + + +/** + * \brief Encrypt/decrypt data with AES + * \param data A pointer to the data to be encrypted/decrypted + * \param len The length of the data to be encrypted/decrypted + * \param key_index The key to use. The key must have previously been set up with cc2420_aes_set_key(). + * + * This function encrypts/decrypts data with AES. A + * pointer to the data is passed as a parameter, and the + * function overwrites the data with the encrypted data. + * + */ +void cc2420_aes_cihper(uint8_t *data, int len, int key_index); + + +#endif /* __CC2420_AES_H__ */