forked from chunyexixiaoyu/xiuos
343 lines
11 KiB
C
343 lines
11 KiB
C
/**
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* @file
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* SNMPv3 crypto/auth functions implemented for ARM mbedtls.
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*/
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/*
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* Copyright (c) 2016 Elias Oenal and Dirk Ziegelmeier.
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Elias Oenal <lwip@eliasoenal.com>
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* Dirk Ziegelmeier <dirk@ziegelmeier.net>
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*/
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#include "lwip/apps/snmpv3.h"
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#include "snmpv3_priv.h"
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#include "lwip/arch.h"
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#include "snmp_msg.h"
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#include "lwip/sys.h"
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#include <string.h>
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#if LWIP_SNMP && LWIP_SNMP_V3 && LWIP_SNMP_V3_MBEDTLS
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#include "mbedtls/md.h"
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#include "mbedtls/cipher.h"
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#include "mbedtls/md5.h"
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#include "mbedtls/sha1.h"
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err_t
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snmpv3_auth(struct snmp_pbuf_stream *stream, u16_t length,
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const u8_t *key, snmpv3_auth_algo_t algo, u8_t *hmac_out)
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{
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u32_t i;
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u8_t key_len;
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const mbedtls_md_info_t *md_info;
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mbedtls_md_context_t ctx;
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struct snmp_pbuf_stream read_stream;
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snmp_pbuf_stream_init(&read_stream, stream->pbuf, stream->offset, stream->length);
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if (algo == SNMP_V3_AUTH_ALGO_MD5) {
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md_info = mbedtls_md_info_from_type(MBEDTLS_MD_MD5);
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key_len = SNMP_V3_MD5_LEN;
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} else if (algo == SNMP_V3_AUTH_ALGO_SHA) {
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md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
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key_len = SNMP_V3_SHA_LEN;
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} else {
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return ERR_ARG;
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}
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mbedtls_md_init(&ctx);
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if (mbedtls_md_setup(&ctx, md_info, 1) != 0) {
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return ERR_ARG;
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}
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if (mbedtls_md_hmac_starts(&ctx, key, key_len) != 0) {
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goto free_md;
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}
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for (i = 0; i < length; i++) {
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u8_t byte;
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if (snmp_pbuf_stream_read(&read_stream, &byte)) {
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goto free_md;
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}
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if (mbedtls_md_hmac_update(&ctx, &byte, 1) != 0) {
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goto free_md;
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}
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}
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if (mbedtls_md_hmac_finish(&ctx, hmac_out) != 0) {
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goto free_md;
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}
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mbedtls_md_free(&ctx);
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return ERR_OK;
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free_md:
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mbedtls_md_free(&ctx);
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return ERR_ARG;
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}
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#if LWIP_SNMP_V3_CRYPTO
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err_t
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snmpv3_crypt(struct snmp_pbuf_stream *stream, u16_t length,
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const u8_t *key, const u8_t *priv_param, const u32_t engine_boots,
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const u32_t engine_time, snmpv3_priv_algo_t algo, snmpv3_priv_mode_t mode)
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{
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size_t i;
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mbedtls_cipher_context_t ctx;
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const mbedtls_cipher_info_t *cipher_info;
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struct snmp_pbuf_stream read_stream;
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struct snmp_pbuf_stream write_stream;
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snmp_pbuf_stream_init(&read_stream, stream->pbuf, stream->offset, stream->length);
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snmp_pbuf_stream_init(&write_stream, stream->pbuf, stream->offset, stream->length);
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mbedtls_cipher_init(&ctx);
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if (algo == SNMP_V3_PRIV_ALGO_DES) {
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u8_t iv_local[8];
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u8_t out_bytes[8];
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size_t out_len;
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/* RFC 3414 mandates padding for DES */
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if ((length & 0x07) != 0) {
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return ERR_ARG;
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}
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cipher_info = mbedtls_cipher_info_from_type(MBEDTLS_CIPHER_DES_CBC);
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if (mbedtls_cipher_setup(&ctx, cipher_info) != 0) {
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return ERR_ARG;
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}
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if (mbedtls_cipher_set_padding_mode(&ctx, MBEDTLS_PADDING_NONE) != 0) {
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return ERR_ARG;
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}
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if (mbedtls_cipher_setkey(&ctx, key, 8 * 8, (mode == SNMP_V3_PRIV_MODE_ENCRYPT) ? MBEDTLS_ENCRYPT : MBEDTLS_DECRYPT) != 0) {
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goto error;
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}
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/* Prepare IV */
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for (i = 0; i < LWIP_ARRAYSIZE(iv_local); i++) {
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iv_local[i] = priv_param[i] ^ key[i + 8];
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}
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if (mbedtls_cipher_set_iv(&ctx, iv_local, LWIP_ARRAYSIZE(iv_local)) != 0) {
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goto error;
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}
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for (i = 0; i < length; i += 8) {
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size_t j;
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u8_t in_bytes[8];
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out_len = LWIP_ARRAYSIZE(out_bytes) ;
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for (j = 0; j < LWIP_ARRAYSIZE(in_bytes); j++) {
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if (snmp_pbuf_stream_read(&read_stream, &in_bytes[j]) != ERR_OK) {
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goto error;
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}
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}
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if (mbedtls_cipher_update(&ctx, in_bytes, LWIP_ARRAYSIZE(in_bytes), out_bytes, &out_len) != 0) {
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goto error;
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}
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if (snmp_pbuf_stream_writebuf(&write_stream, out_bytes, (u16_t)out_len) != ERR_OK) {
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goto error;
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}
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}
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out_len = LWIP_ARRAYSIZE(out_bytes);
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if (mbedtls_cipher_finish(&ctx, out_bytes, &out_len) != 0) {
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goto error;
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}
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if (snmp_pbuf_stream_writebuf(&write_stream, out_bytes, (u16_t)out_len) != ERR_OK) {
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goto error;
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}
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} else if (algo == SNMP_V3_PRIV_ALGO_AES) {
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u8_t iv_local[16];
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cipher_info = mbedtls_cipher_info_from_type(MBEDTLS_CIPHER_AES_128_CFB128);
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if (mbedtls_cipher_setup(&ctx, cipher_info) != 0) {
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return ERR_ARG;
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}
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if (mbedtls_cipher_setkey(&ctx, key, 16 * 8, (mode == SNMP_V3_PRIV_MODE_ENCRYPT) ? MBEDTLS_ENCRYPT : MBEDTLS_DECRYPT) != 0) {
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goto error;
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}
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/*
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* IV is the big endian concatenation of boots,
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* uptime and priv param - see RFC3826.
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*/
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iv_local[0 + 0] = (engine_boots >> 24) & 0xFF;
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iv_local[0 + 1] = (engine_boots >> 16) & 0xFF;
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iv_local[0 + 2] = (engine_boots >> 8) & 0xFF;
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iv_local[0 + 3] = (engine_boots >> 0) & 0xFF;
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iv_local[4 + 0] = (engine_time >> 24) & 0xFF;
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iv_local[4 + 1] = (engine_time >> 16) & 0xFF;
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iv_local[4 + 2] = (engine_time >> 8) & 0xFF;
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iv_local[4 + 3] = (engine_time >> 0) & 0xFF;
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SMEMCPY(iv_local + 8, priv_param, 8);
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if (mbedtls_cipher_set_iv(&ctx, iv_local, LWIP_ARRAYSIZE(iv_local)) != 0) {
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goto error;
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}
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for (i = 0; i < length; i++) {
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u8_t in_byte;
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u8_t out_byte;
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size_t out_len = sizeof(out_byte);
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if (snmp_pbuf_stream_read(&read_stream, &in_byte) != ERR_OK) {
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goto error;
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}
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if (mbedtls_cipher_update(&ctx, &in_byte, sizeof(in_byte), &out_byte, &out_len) != 0) {
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goto error;
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}
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if (snmp_pbuf_stream_write(&write_stream, out_byte) != ERR_OK) {
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goto error;
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}
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}
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} else {
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return ERR_ARG;
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}
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mbedtls_cipher_free(&ctx);
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return ERR_OK;
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error:
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mbedtls_cipher_free(&ctx);
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return ERR_OK;
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}
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#endif /* LWIP_SNMP_V3_CRYPTO */
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/* A.2.1. Password to Key Sample Code for MD5 */
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void
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snmpv3_password_to_key_md5(
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const u8_t *password, /* IN */
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size_t passwordlen, /* IN */
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const u8_t *engineID, /* IN - pointer to snmpEngineID */
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u8_t engineLength,/* IN - length of snmpEngineID */
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u8_t *key) /* OUT - pointer to caller 16-octet buffer */
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{
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mbedtls_md5_context MD;
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u8_t *cp, password_buf[64];
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u32_t password_index = 0;
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u8_t i;
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u32_t count = 0;
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mbedtls_md5_init(&MD); /* initialize MD5 */
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mbedtls_md5_starts(&MD);
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/**********************************************/
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/* Use while loop until we've done 1 Megabyte */
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/**********************************************/
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while (count < 1048576) {
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cp = password_buf;
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for (i = 0; i < 64; i++) {
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/*************************************************/
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/* Take the next octet of the password, wrapping */
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/* to the beginning of the password as necessary.*/
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/*************************************************/
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*cp++ = password[password_index++ % passwordlen];
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}
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mbedtls_md5_update(&MD, password_buf, 64);
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count += 64;
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}
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mbedtls_md5_finish(&MD, key); /* tell MD5 we're done */
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/*****************************************************/
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/* Now localize the key with the engineID and pass */
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/* through MD5 to produce final key */
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/* May want to ensure that engineLength <= 32, */
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/* otherwise need to use a buffer larger than 64 */
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/*****************************************************/
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SMEMCPY(password_buf, key, 16);
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MEMCPY(password_buf + 16, engineID, engineLength);
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SMEMCPY(password_buf + 16 + engineLength, key, 16);
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mbedtls_md5_starts(&MD);
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mbedtls_md5_update(&MD, password_buf, 32 + engineLength);
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mbedtls_md5_finish(&MD, key);
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mbedtls_md5_free(&MD);
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return;
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}
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/* A.2.2. Password to Key Sample Code for SHA */
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void
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snmpv3_password_to_key_sha(
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const u8_t *password, /* IN */
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size_t passwordlen, /* IN */
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const u8_t *engineID, /* IN - pointer to snmpEngineID */
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u8_t engineLength,/* IN - length of snmpEngineID */
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u8_t *key) /* OUT - pointer to caller 20-octet buffer */
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{
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mbedtls_sha1_context SH;
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u8_t *cp, password_buf[72];
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u32_t password_index = 0;
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u8_t i;
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u32_t count = 0;
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mbedtls_sha1_init(&SH); /* initialize SHA */
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mbedtls_sha1_starts(&SH);
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/**********************************************/
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/* Use while loop until we've done 1 Megabyte */
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/**********************************************/
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while (count < 1048576) {
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cp = password_buf;
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for (i = 0; i < 64; i++) {
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/*************************************************/
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/* Take the next octet of the password, wrapping */
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/* to the beginning of the password as necessary.*/
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/*************************************************/
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*cp++ = password[password_index++ % passwordlen];
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}
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mbedtls_sha1_update(&SH, password_buf, 64);
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count += 64;
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}
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mbedtls_sha1_finish(&SH, key); /* tell SHA we're done */
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/*****************************************************/
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/* Now localize the key with the engineID and pass */
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/* through SHA to produce final key */
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/* May want to ensure that engineLength <= 32, */
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/* otherwise need to use a buffer larger than 72 */
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/*****************************************************/
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SMEMCPY(password_buf, key, 20);
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MEMCPY(password_buf + 20, engineID, engineLength);
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SMEMCPY(password_buf + 20 + engineLength, key, 20);
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mbedtls_sha1_starts(&SH);
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mbedtls_sha1_update(&SH, password_buf, 40 + engineLength);
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mbedtls_sha1_finish(&SH, key);
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mbedtls_sha1_free(&SH);
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return;
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}
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#endif /* LWIP_SNMP && LWIP_SNMP_V3 && LWIP_SNMP_V3_MBEDTLS */
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