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This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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. * */ /** * @file * @brief Implementation of Gazell Pairing Library (gzp), Common functions. * @defgroup gzp_source_common Gazell Pairing common functions implementation * @{ * @ingroup gzp_04_source */ #include "nrf_gzp.h" #include "nrf_gzll.h" #include "nrf_ecb.h" #include #define SOURCE_FILE NRF_SOURCE_FILE_GZP ///< File identifer for asserts. /******************************************************************************/ /** @name Global variables * @{ */ /******************************************************************************/ /** * Constant holding base address part of the pairing address. */ static const uint8_t pairing_base_address[4] = { GZP_ADDRESS }; /** * Constant holding prefix byte of the pairing address. */ static const uint8_t pairing_address_prefix_byte = 0; /** * Constant holding pre-defined "validation ID". */ static const uint8_t gzp_validation_id[GZP_VALIDATION_ID_LENGTH] = GZP_VALIDATION_ID; /** * Constant holding pre-defined "secret key". */ static const uint8_t gzp_secret_key[16] = GZP_SECRET_KEY; /** * Variable used for AES key selection */ static gzp_key_select_t gzp_key_select; /** @} */ /******************************************************************************/ /** @name Misc. external variables. * @{ */ /******************************************************************************/ static uint8_t gzp_session_token[GZP_SESSION_TOKEN_LENGTH]; static uint8_t gzp_dyn_key[GZP_DYN_KEY_LENGTH]; /** @} */ /******************************************************************************/ /** @name Implementation common internal GZP functions * @{ */ /******************************************************************************/ bool gzp_update_radio_params(const uint8_t* system_address) { uint8_t i; uint8_t channels[NRF_GZLL_CONST_MAX_CHANNEL_TABLE_SIZE]; uint32_t channel_table_size; uint32_t pairing_base_address_32, system_address_32; bool update_ok = true; bool gzll_enabled_state; gzll_enabled_state = nrf_gzll_is_enabled(); // Configure "global" pairing address pairing_base_address_32 = (pairing_base_address[0]) + ((uint32_t)pairing_base_address[1] << 8) + ((uint32_t)pairing_base_address[2] << 16) + ((uint32_t)pairing_base_address[3] << 24) ; if (system_address != NULL) { system_address_32 = (system_address[0]) + ((uint32_t)system_address[1] << 8) + ((uint32_t)system_address[2] << 16) + ((uint32_t)system_address[3] << 24) ; } else { return false; } nrf_gzp_disable_gzll(); update_ok = update_ok && nrf_gzll_set_base_address_0(pairing_base_address_32); update_ok = update_ok && nrf_gzll_set_address_prefix_byte(GZP_PAIRING_PIPE, pairing_address_prefix_byte); update_ok = update_ok && nrf_gzll_set_base_address_1(system_address_32); // Configure address for pipe 1 - 5. Address byte set to equal pipe number. for (i = 1; i < NRF_GZLL_CONST_PIPE_COUNT; i++) { update_ok = update_ok && nrf_gzll_set_address_prefix_byte(i,i); } channel_table_size = nrf_gzll_get_channel_table_size(); gzp_generate_channels(&channels[0], system_address, channel_table_size); // Write generated channel subset to Gazell Link Layer update_ok = update_ok && nrf_gzll_set_channel_table(&channels[0], channel_table_size); if (gzll_enabled_state) { update_ok = update_ok && nrf_gzll_enable(); } return update_ok; } void gzp_generate_channels(uint8_t* ch_dst, const uint8_t* system_address, uint8_t channel_tab_size) { uint8_t binsize, spacing, i; binsize = (GZP_CHANNEL_MAX - GZP_CHANNEL_MIN) / channel_tab_size; ch_dst[0] = GZP_CHANNEL_LOW; ch_dst[channel_tab_size - 1] = GZP_CHANNEL_HIGH; if (system_address != NULL) { for (i = 1; i < (channel_tab_size - 1); i++) { ch_dst[i] = (binsize * i) + (system_address[i % 4] % binsize); } } // If channels are too close, shift them to better positions for (i = 1; i < channel_tab_size; i++) { spacing = (ch_dst[i] - ch_dst[i - 1]); if (spacing < GZP_CHANNEL_SPACING_MIN) { ch_dst[i] += (GZP_CHANNEL_SPACING_MIN - spacing); } } } __INLINE void nrf_gzp_disable_gzll(void) { if (nrf_gzll_is_enabled()) { nrf_gzll_disable(); __WFI(); while (nrf_gzll_is_enabled()) { } } } #ifndef GZP_CRYPT_DISABLE void gzp_xor_cipher(uint8_t* dst, const uint8_t* src, const uint8_t* pad, uint8_t length) { uint8_t i; for (i = 0; i < length; i++) { *dst = *src ^ *pad; dst++; src++; pad++; } } bool gzp_validate_id(const uint8_t* id) { return (memcmp(id, (void*)gzp_validation_id, GZP_VALIDATION_ID_LENGTH) == 0); } void gzp_add_validation_id(uint8_t* dst) { memcpy(dst, (void const*)gzp_validation_id, GZP_VALIDATION_ID_LENGTH); } void gzp_crypt_set_session_token(const uint8_t * token) { memcpy(gzp_session_token, (void const*)token, GZP_SESSION_TOKEN_LENGTH); } void gzp_crypt_set_dyn_key(const uint8_t* key) { memcpy(gzp_dyn_key, (void const*)key, GZP_DYN_KEY_LENGTH); } void gzp_crypt_get_session_token(uint8_t * dst_token) { memcpy(dst_token, (void const*)gzp_session_token, GZP_SESSION_TOKEN_LENGTH); } void gzp_crypt_get_dyn_key(uint8_t* dst_key) { memcpy(dst_key, (void const*)gzp_dyn_key, GZP_DYN_KEY_LENGTH); } void gzp_crypt_select_key(gzp_key_select_t key_select) { gzp_key_select = key_select; } void gzp_crypt(uint8_t* dst, const uint8_t* src, uint8_t length) { uint8_t i; uint8_t key[16]; uint8_t iv[16]; // Build AES key based on "gzp_key_select" switch (gzp_key_select) { case GZP_ID_EXCHANGE: memcpy(key, (void const*)gzp_secret_key, 16); break; case GZP_KEY_EXCHANGE: memcpy(key, (void const*)gzp_secret_key, 16); gzp_get_host_id(key); break; case GZP_DATA_EXCHANGE: memcpy(key, (void const*)gzp_secret_key, 16); memcpy(key, (void const*)gzp_dyn_key, GZP_DYN_KEY_LENGTH); break; default: return; } // Build init vector from "gzp_session_token" for (i = 0; i < 16; i++) { if (i < GZP_SESSION_TOKEN_LENGTH) { iv[i] = gzp_session_token[i]; } else { iv[i] = 0; } } // Set up hal_aes using new key and init vector (void)nrf_ecb_init(); nrf_ecb_set_key(key); //hal_aes_setup(false, ECB, key, NULL); // Note, here we skip the IV as we use ECB mode // Encrypt IV using ECB mode (void)nrf_ecb_crypt(iv, iv); // Encrypt data by XOR'ing with AES output gzp_xor_cipher(dst, src, iv, length); } void gzp_random_numbers_generate(uint8_t * dst, uint8_t n) { uint8_t i; NRF_RNG->EVENTS_VALRDY=0; NRF_RNG->TASKS_START = 1; for (i = 0; i < n; i++) { while (NRF_RNG->EVENTS_VALRDY==0) {} dst[i] = (uint8_t)NRF_RNG->VALUE; NRF_RNG->EVENTS_VALRDY=0; } NRF_RNG->TASKS_STOP = 1; } /******************************************************************************/ /** @name Implementation of nRF51 specific GZP functions * @{ */ /******************************************************************************/ /** * @brief Function for setting the Primask variable. Only necessary if ARMCC * compiler skips __set_PRIMASK at high optimization levels. * * @param primask The primask value. 1 to disable interrupts, 0 otherwise. */ static void nrf_gzp_set_primask(uint32_t primask) { #if defined(__CC_ARM) //lint -save -e10 -e618 -e438 -e550 -e526 -e628 -e526 volatile register uint32_t __regPriMask __ASM("primask"); __regPriMask = (primask); #else __set_PRIMASK(primask); #endif //lint -restore } void nrf_gzp_flush_rx_fifo(uint32_t pipe) { static uint8_t dummy_packet[NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH]; uint32_t length; nrf_gzp_set_primask(1); while (nrf_gzll_get_rx_fifo_packet_count(pipe) >0) { length = NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH; (void)nrf_gzll_fetch_packet_from_rx_fifo(pipe,dummy_packet,&length); } nrf_gzp_set_primask(0); } /** @} */ /******************************************************************************/ /** @name Implementation of debug functions * @{ */ /******************************************************************************/ /** @} */ /** @} */ #endif