cc2538: Add AES-CCM* driver

Signed-off-by: Benoît Thébaudeau <[email protected]>

cpu/cc2538/Makefile.cc2538

@@ -54,7 +54,7 @@ CONTIKI_CPU_DIRS += ../cc253x/usb/common ../cc253x/usb/common/cdc-acm
 CONTIKI_CPU_SOURCEFILES += clock.c rtimer-arch.c uart.c watchdog.c
 CONTIKI_CPU_SOURCEFILES += nvic.c cpu.c sys-ctrl.c gpio.c ioc.c spi.c adc.c
 CONTIKI_CPU_SOURCEFILES += crypto.c aes.c ecb.c ccm.c sha256.c
-CONTIKI_CPU_SOURCEFILES += cc2538-aes-128.c
+CONTIKI_CPU_SOURCEFILES += cc2538-aes-128.c cc2538-ccm-star.c
 CONTIKI_CPU_SOURCEFILES += cc2538-rf.c udma.c lpm.c
 CONTIKI_CPU_SOURCEFILES += pka.c bignum-driver.c ecc-driver.c ecc-algorithm.c
 CONTIKI_CPU_SOURCEFILES += ecc-curve.c

cpu/cc2538/dev/cc2538-ccm-star.c

@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2015, Benoît Thébaudeau <[email protected]>
+ * 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 copyright holder 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDER 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.
+ */
+/**
+ * \addtogroup cc2538-ccm-star
+ * @{
+ *
+ * \file
+ * Implementation of the AES-CCM* driver for the CC2538 SoC
+ */
+#include "contiki.h"
+#include "dev/ccm.h"
+#include "dev/cc2538-aes-128.h"
+#include "dev/cc2538-ccm-star.h"
+
+#include <stdint.h>
+#include <stdio.h>
+/*---------------------------------------------------------------------------*/
+#define MODULE_NAME     "cc2538-ccm-star"
+
+#define CCM_STAR_LEN_LEN        (CCM_NONCE_LEN_LEN - CCM_STAR_NONCE_LENGTH)
+
+#define DEBUG 0
+#if DEBUG
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
+/*---------------------------------------------------------------------------*/
+static uint8_t
+enable_crypto(void)
+{
+  uint8_t enabled = CRYPTO_IS_ENABLED();
+  if(!enabled) {
+    crypto_enable();
+  }
+  return enabled;
+}
+/*---------------------------------------------------------------------------*/
+static void
+restore_crypto(uint8_t enabled)
+{
+  if(!enabled) {
+    crypto_disable();
+  }
+}
+/*---------------------------------------------------------------------------*/
+static void
+set_key(const uint8_t *key)
+{
+  cc2538_aes_128_driver.set_key(key);
+}
+/*---------------------------------------------------------------------------*/
+static void
+aead(const uint8_t *nonce, uint8_t *m, uint8_t m_len, const uint8_t *a,
+     uint8_t a_len, uint8_t *result, uint8_t mic_len, int forward)
+{
+  uint16_t cdata_len;
+  uint8_t crypto_enabled, ret;
+
+  crypto_enabled = enable_crypto();
+
+  if(forward) {
+    ret = ccm_auth_encrypt_start(CCM_STAR_LEN_LEN, CC2538_AES_128_KEY_AREA,
+                                 nonce, a, a_len, m, m_len, m, mic_len, NULL);
+    if(ret != CRYPTO_SUCCESS) {
+      PRINTF("%s: ccm_auth_encrypt_start() error %u\n", MODULE_NAME, ret);
+      restore_crypto(crypto_enabled);
+      return;
+    }
+
+    while(!ccm_auth_encrypt_check_status());
+    ret = ccm_auth_encrypt_get_result(result, mic_len);
+    if(ret != CRYPTO_SUCCESS) {
+      PRINTF("%s: ccm_auth_encrypt_get_result() error %u\n", MODULE_NAME, ret);
+    }
+  } else {
+    cdata_len = m_len + mic_len;
+    ret = ccm_auth_decrypt_start(CCM_STAR_LEN_LEN, CC2538_AES_128_KEY_AREA,
+                                 nonce, a, a_len, m, cdata_len, m, mic_len,
+                                 NULL);
+    if(ret != CRYPTO_SUCCESS) {
+      PRINTF("%s: ccm_auth_decrypt_start() error %u\n", MODULE_NAME, ret);
+      restore_crypto(crypto_enabled);
+      return;
+    }
+
+    while(!ccm_auth_decrypt_check_status());
+    ret = ccm_auth_decrypt_get_result(m, cdata_len, result, mic_len);
+    if(ret != CRYPTO_SUCCESS) {
+      PRINTF("%s: ccm_auth_decrypt_get_result() error %u\n", MODULE_NAME, ret);
+    }
+  }
+
+  restore_crypto(crypto_enabled);
+}
+/*---------------------------------------------------------------------------*/
+const struct ccm_star_driver cc2538_ccm_star_driver = {
+  set_key,
+  aead
+};
+
+/** @} */

cpu/cc2538/dev/cc2538-ccm-star.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2015, Benoît Thébaudeau <[email protected]>
+ * 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 copyright holder 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDER 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.
+ */
+/**
+ * \addtogroup cc2538-aes
+ * @{
+ *
+ * \defgroup cc2538-ccm-star CC2538 AES-CCM*
+ *
+ * AES-CCM* driver for the CC2538 SoC
+ * @{
+ *
+ * \file
+ * Header file of the AES-CCM* driver for the CC2538 SoC
+ */
+#ifndef CC2538_CCM_STAR_H_
+#define CC2538_CCM_STAR_H_
+
+#include "lib/ccm-star.h"
+/*---------------------------------------------------------------------------*/
+extern const struct ccm_star_driver cc2538_ccm_star_driver;
+
+#endif /* CC2538_CCM_STAR_H_ */
+
+/**
+ * @}
+ * @}
+ */

cpu/cc2538/dev/ccm.c

@@ -96,14 +96,14 @@ ccm_auth_crypt_get_result(const void *cdata, uint16_t cdata_len,
     /* Check MIC */
     data_len = cdata_len - mic_len;
     if(rom_util_memcmp(tag, &((const uint8_t *)cdata)[data_len], mic_len)) {
-      return AES_AUTHENTICATION_FAILED;
+      ret = AES_AUTHENTICATION_FAILED;
     }
   }
 
   /* Copy tag to MIC */
   rom_util_memcpy(mic, tag, mic_len);
 
-  return CRYPTO_SUCCESS;
+  return ret;
 }
 /*---------------------------------------------------------------------------*/
 uint8_t

platform/cc2538dk/contiki-conf.h

@@ -512,6 +512,10 @@ typedef uint32_t rtimer_clock_t;
 #ifndef AES_128_CONF
 #define AES_128_CONF            cc2538_aes_128_driver /**< AES-128 driver */
 #endif
+
+#ifndef CCM_STAR_CONF
+#define CCM_STAR_CONF           cc2538_ccm_star_driver /**< AES-CCM* driver */
+#endif
 /** @} */
 /*---------------------------------------------------------------------------*/
 

platform/zoul/contiki-conf.h

@@ -580,6 +580,10 @@ typedef uint32_t rtimer_clock_t;
 #ifndef AES_128_CONF
 #define AES_128_CONF            cc2538_aes_128_driver /**< AES-128 driver */
 #endif
+
+#ifndef CCM_STAR_CONF
+#define CCM_STAR_CONF           cc2538_ccm_star_driver /**< AES-CCM* driver */
+#endif
 /** @} */
 /*---------------------------------------------------------------------------*/