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105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
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* Copyright (C) 2020 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup pkg_openwsn
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* @{
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*
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* @file
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* @brief RIOT adaption definition of the "cryptoengine" module
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*
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* @author Francisco Molina <francois-xavier.molina@inria.fr>
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*
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* @}
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*/
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#include <stdio.h>
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#include "opendefs.h"
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#include "crypto/ciphers.h"
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#include "crypto/modes/ecb.h"
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#include "crypto/modes/ccm.h"
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/* CCM does not restrict the input message size, but these function will
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only be called with a message length of at most 125b in OpenWSN */
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#define MAX_MESSAGE_LEN (125U)
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owerror_t cryptoengine_aes_ccms_enc(uint8_t *a, uint8_t len_a, uint8_t *m,
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uint8_t *len_m, uint8_t *nonce, uint8_t l,
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uint8_t *key, uint8_t len_mac)
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{
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cipher_t cipher;
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int ret, len;
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uint8_t tmp_buff[MAX_MESSAGE_LEN + CCM_MAC_MAX_LEN];
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ret = cipher_init(&cipher, CIPHER_AES, key, CCM_BLOCK_SIZE);
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if (ret != 1) {
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return E_FAIL;
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}
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len = cipher_encrypt_ccm(&cipher, a, len_a, len_mac, l,
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nonce, 15 - l, m, *len_m, tmp_buff);
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if (len < 0) {
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return E_FAIL;
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}
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*len_m = len;
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memcpy(m, tmp_buff, *len_m);
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return E_SUCCESS;
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}
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owerror_t cryptoengine_aes_ccms_dec(uint8_t *a, uint8_t len_a, uint8_t *m,
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uint8_t *len_m, uint8_t *nonce, uint8_t l,
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uint8_t *key, uint8_t len_mac)
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{
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cipher_t cipher;
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int ret, len;
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uint8_t tmp_buff[MAX_MESSAGE_LEN];
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ret = cipher_init(&cipher, CIPHER_AES, key, CCM_BLOCK_SIZE);
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if (ret != 1) {
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return E_FAIL;
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}
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len = cipher_decrypt_ccm(&cipher, a, len_a, len_mac, l, nonce, 15 - l, m,
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*len_m, tmp_buff);
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if (len < 0) {
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return E_FAIL;
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}
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*len_m = len;
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memcpy(m, tmp_buff, *len_m);
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return E_SUCCESS;
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}
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owerror_t cryptoengine_aes_ecb_enc(uint8_t *buffer, uint8_t *key)
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{
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cipher_t cipher;
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int ret, len;
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ret = cipher_init(&cipher, CIPHER_AES, key, CCM_BLOCK_SIZE);
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if (ret != 1) {
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return E_FAIL;
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}
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len = cipher_encrypt_ecb(&cipher, buffer, CCM_BLOCK_SIZE, buffer);
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if (len < 0) {
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return E_FAIL;
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}
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return E_SUCCESS;
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}
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