125 lines
4.7 KiB
C
125 lines
4.7 KiB
C
/*
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* Copyright (c) 2015, Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-gcm
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* @{
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*
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* \file
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* Implementation of the cc2538 AES-GCM driver
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*/
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#include "contiki.h"
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#include "dev/rom-util.h"
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#include "dev/gcm.h"
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#include <stdbool.h>
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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static uint8_t
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gcm_auth_crypt_start(uint8_t encrypt, uint8_t key_area, const void *iv,
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const void *adata, uint16_t adata_len,
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const void *data_in, void *data_out, uint16_t data_len,
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struct process *process)
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{
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uint32_t ctrl;
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uint32_t aes_iv[AES_IV_LEN / sizeof(uint32_t)];
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/* Program AES-GCM authentication/crypto operation */
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ctrl = AES_AES_CTRL_SAVE_CONTEXT | /* Save context */
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AES_AES_CTRL_GCM | /* GCM */
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AES_AES_CTRL_CTR_WIDTH_32 | /* CTR width 32 */
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AES_AES_CTRL_CTR | /* CTR */
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(encrypt ? AES_AES_CTRL_DIRECTION_ENCRYPT : 0); /* En/decryption */
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/* Prepare the crypto initialization vector
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* Initialization vector */
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rom_util_memcpy(aes_iv, iv, GCM_IV_LEN);
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/* Initialize counter to 1 */
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aes_iv[GCM_IV_LEN / sizeof(aes_iv[0])] = 0x01000000;
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return aes_auth_crypt_start(ctrl, key_area, aes_iv, adata, adata_len,
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data_in, data_out, data_len, process);
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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gcm_auth_crypt_get_result(const void *tag_in, void *tag_out)
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{
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uint32_t tag[AES_TAG_LEN / sizeof(uint32_t)];
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uint8_t ret;
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ret = aes_auth_crypt_get_result(NULL, tag);
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if(ret != CRYPTO_SUCCESS) {
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return ret;
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}
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if(tag_in != NULL) {
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/* Check tag */
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if(rom_util_memcmp(tag, tag_in, GCM_TAG_LEN)) {
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ret = AES_AUTHENTICATION_FAILED;
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}
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}
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if(tag_out != NULL) {
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/* Copy tag */
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rom_util_memcpy(tag_out, tag, GCM_TAG_LEN);
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}
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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gcm_auth_encrypt_start(uint8_t key_area, const void *iv, const void *adata,
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uint16_t adata_len, const void *pdata,
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uint16_t pdata_len, void *cdata, struct process *process)
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{
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return gcm_auth_crypt_start(true, key_area, iv, adata, adata_len,
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pdata, cdata, pdata_len, process);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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gcm_auth_encrypt_get_result(void *tag)
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{
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return gcm_auth_crypt_get_result(NULL, tag);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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gcm_auth_decrypt_start(uint8_t key_area, const void *iv, const void *adata,
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uint16_t adata_len, const void *cdata,
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uint16_t cdata_len, void *pdata, struct process *process)
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{
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return gcm_auth_crypt_start(false, key_area, iv, adata, adata_len,
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cdata, pdata, cdata_len, process);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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gcm_auth_decrypt_get_result(const void *tag_in, void *tag_out)
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__attribute__ ((alias("gcm_auth_crypt_get_result")));
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/** @} */
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