Esp8266 细聊HmacMD5的加密方法带来的安全性，并实践在esp8266上，最大保障传输的过程的信息的安全性

/* * SSLv3/TLSv1 shared functions * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of mbed TLS (https://tls.mbed.org) */ /* * The SSL 3.0 specification was drafted by Netscape in 1996, * and became an IETF standard in 1999. * * http://wp.netscape.com/eng/ssl3/ * http://www.ietf.org/rfc/rfc2246.txt * http://www.ietf.org/rfc/rfc4346.txt */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_SSL_TLS_C) #include "mbedtls/debug.h" #include "mbedtls/ssl.h" #include "mbedtls/ssl_internal.h" #include <string.h> #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) #include "mbedtls/oid.h" #endif #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include <stdlib.h> #define mbedtls_calloc calloc #define mbedtls_free free #endif /* Implementation that should never be optimized out by the compiler */ static void mbedtls_zeroize( void *v, size_t n ) { volatile unsigned char *p = v; while( n-- ) *p++ = 0; } /* Length of the "epoch" field in the record header */ static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl ) { #if defined(MBEDTLS_SSL_PROTO_DTLS) if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) return( 2 ); #else ((void) ssl); #endif return( 0 ); } /* * Start a timer. * Passing millisecs = 0 cancels a running timer. */ static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs ) { if( ssl->f_set_timer == NULL ) return; MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) ); ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs ); } /* * Return -1 is timer is expired, 0 if it isn't. */ static int ssl_check_timer( mbedtls_ssl_context *ssl ) { if( ssl->f_get_timer == NULL ) return( 0 ); if( ssl->f_get_timer( ssl->p_timer ) == 2 ) { MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) ); return( -1 ); } return( 0 ); } #if defined(MBEDTLS_SSL_PROTO_DTLS) /* * Double the retransmit timeout value, within the allowed range, * returning -1 if the maximum value has already been reached. */ static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl ) { uint32_t new_timeout; if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max ) return( -1 ); new_timeout = 2 * ssl->handshake->retransmit_timeout; /* Avoid arithmetic overflow and range overflow */ if( new_timeout < ssl->handshake->retransmit_timeout || new_timeout > ssl->conf->hs_timeout_max ) { new_timeout = ssl->conf->hs_timeout_max; } ssl->handshake->retransmit_timeout = new_timeout; MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", ssl->handshake->retransmit_timeout ) ); return( 0 ); } static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl ) { ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min; MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", ssl->handshake->retransmit_timeout ) ); } #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) /* * Convert max_fragment_length codes to length. * RFC 6066 says: * enum{ * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) * } MaxFragmentLength; * and we add 0 -> extension unused */ static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] = { MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */ 512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */ 1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */ 2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */ 4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */ }; #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_CLI_C) static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src ) { mbedtls_ssl_session_free( dst ); memcpy( dst, src, sizeof( mbedtls_ssl_session ) ); #if defined(MBEDTLS_X509_CRT_PARSE_C) if( src->peer_cert != NULL ) { int ret; dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) ); if( dst->peer_cert == NULL ) return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); mbedtls_x509_crt_init( dst->peer_cert ); if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p, src->peer_cert->raw.len ) ) != 0 ) { mbedtls_free( dst->peer_cert ); dst->peer_cert = NULL; return( ret ); } } #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) if( src->ticket != NULL ) { dst->ticket = mbedtls_calloc( 1, src->ticket_len ); if( dst->ticket == NULL ) return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); memcpy( dst->ticket, src->ticket, src->ticket_len ); } #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ return( 0 ); } #endif /* MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl, const unsigned char *key_enc, const unsigned char *key_dec, size_t keylen, const unsigned char *iv_enc, const unsigned char *iv_dec, size_t ivlen, const unsigned char *mac_enc, const unsigned char *mac_dec, size_t maclen ) = NULL; int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL; int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL; int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL; int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL; int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL; #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ /* * Key material generation */ #if defined(MBEDTLS_SSL_PROTO_SSL3) static int ssl3_prf( const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen ) { size_t i; mbedtls_md5_context md5; mbedtls_sha1_context sha1; unsigned char padding[16]; unsigned char sha1sum[20]; ((void)label); mbedtls_md5_init( &md5 ); mbedtls_sha1_init( &sha1 ); /* * SSLv3: * block = * MD5( secret + SHA1( 'A' + secret + random ) ) + * MD5( secret + SHA1( 'BB' + secret + random ) ) + * MD5( secret + SHA1( 'CCC' + secret + random ) ) + * ... */ for( i = 0; i < dlen / 16; i++ ) { memset( padding, (unsigned char) ('A' + i), 1 + i ); mbedtls_sha1_starts( &sha1 ); mbedtls_sha1_update( &sha1, padding, 1 + i ); mbedtls_sha1_update( &sha1, secret, slen ); mbedtls_sha1_update( &sha1, random, rlen ); mbedtls_sha1_finish( &sha1, sha1sum ); mbedtls_md5_starts( &md5 ); mbedtls_md5_update( &md5, secret, slen ); mbedtls_md5_update( &md5, sha1sum, 20 ); mbedtls_md5_