mirror of https://github.com/ARMmbed/mbed-os.git
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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* Copyright (c) 2017-2018, Pelion and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "nsconfig.h"
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#include "ns_types.h"
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#ifdef PANA
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#include "ns_trace.h"
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#include "string.h"
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#include "ccmLIB.h"
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#include "ns_trace.h"
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#include "common_functions.h"
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#define CLIENT_WRITE_KEY 0
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#define SERVER_WRITE_KEY 16
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#define CLIENT_IV 32
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#define SERVER_IV 36
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#define TRACE_GROUP "cryp"
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#define TLS_1_2_VER 0x0303
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static bool tls_ccm_init(ccm_globals_t *ccm_ptr, const uint8_t *key_expansion, const uint8_t *nonce, bool server, uint8_t crypt_process)
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{
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const uint8_t *key, *iv_ptr;
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if (server) {
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key = key_expansion + SERVER_WRITE_KEY;
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iv_ptr = key_expansion + SERVER_IV;
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} else {
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key = key_expansion + CLIENT_WRITE_KEY;
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iv_ptr = key_expansion + CLIENT_IV;
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}
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if (!ccm_sec_init(ccm_ptr, AES_SECURITY_LEVEL_ENC_MIC64, key, crypt_process, 3)) {
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return false;
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}
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memcpy(ccm_ptr->exp_nonce, iv_ptr, 4);
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memcpy(&ccm_ptr->exp_nonce[4], nonce, 8);
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return true;
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}
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static void tls_set_adata(ccm_globals_t *ccm_ptr, uint8_t *a_data, const uint8_t *nonce, uint8_t type)
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{
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ccm_ptr->adata_len = 13;
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ccm_ptr->adata_ptr = a_data;
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memcpy(a_data, nonce, 8);
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a_data += 8;
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*a_data++ = type;
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a_data = common_write_16_bit(TLS_1_2_VER, a_data);
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common_write_16_bit(ccm_ptr->data_len, a_data);
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}
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int8_t tls_ccm_data_encrypt(uint8_t *data_ptr, uint16_t data_length, const uint8_t *key_expansion, const uint8_t *nonce, uint8_t type, bool server)
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{
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ccm_globals_t ccm_ptr;
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if (!tls_ccm_init(&ccm_ptr, key_expansion, nonce, server, AES_CCM_ENCRYPT)) {
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return -1;
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}
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uint8_t adata[13];
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ccm_ptr.data_len = data_length;
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ccm_ptr.data_ptr = data_ptr;
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ccm_ptr.mic = (ccm_ptr.data_ptr + ccm_ptr.data_len);
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tls_set_adata(&ccm_ptr, adata, nonce, type);
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return ccm_process_run(&ccm_ptr);
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}
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int8_t tls_ccm_data_decrypt(uint8_t *data_ptr, uint16_t data_length, const uint8_t *key_expansion, uint8_t type, bool server)
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{
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if (data_length <= 16) {
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return -1;
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}
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ccm_globals_t ccm_ptr;
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if (!tls_ccm_init(&ccm_ptr, key_expansion, data_ptr, server, AES_CCM_DECRYPT)) {
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return -1;
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}
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uint8_t adata[13];
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ccm_ptr.data_len = data_length - 16;
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tls_set_adata(&ccm_ptr, adata, data_ptr, type);
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ccm_ptr.data_ptr = data_ptr + 8;
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ccm_ptr.mic = (ccm_ptr.data_ptr + ccm_ptr.data_len);
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return ccm_process_run(&ccm_ptr);
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}
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#endif
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