Valerii Koval
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*******************************************************************************
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*
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* Copyright (c) 2011, 2012, 2013, 2014, 2015 Olaf Bergmann (TZI) and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
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*
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* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Olaf Bergmann - initial API and implementation
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* Hauke Mehrtens - memory optimization, ECC integration
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*
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*******************************************************************************/
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#ifndef _DTLS_GLOBAL_H_
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#define _DTLS_GLOBAL_H_
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#include <stdlib.h>
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#include <sys/types.h>
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#include "tinydtls.h"
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#ifndef DTLSv12
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/* The current version of tinyDTLS supports DTLSv1.2 only. */
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#define DTLSv12 1
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#endif
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#ifndef WITH_SHA256
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/* The current version of tinyDTLS supports DTLSv1.2 with SHA256 PRF
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only. */
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#define WITH_SHA256 1
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#endif
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/* Define our own types as at least uint32_t does not work on my amd64. */
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typedef unsigned char uint8;
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typedef unsigned char uint16[2];
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typedef unsigned char uint24[3];
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typedef unsigned char uint32[4];
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typedef unsigned char uint48[6];
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#ifndef DTLS_MAX_BUF
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/** Maximum size of DTLS message.
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When Peers are sending bigger messages this causes problems. Californium
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with ECDSA needs at least 220 */
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#if (defined(WITH_CONTIKI) || defined(RIOT_VERSION))
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#ifdef DTLS_ECC
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#define DTLS_MAX_BUF 200
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#else /* DTLS_ECC */
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#define DTLS_MAX_BUF 120
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#endif /* DTLS_ECC */
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#else /* WITH_CONTIKI */
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#define DTLS_MAX_BUF 1400
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#endif /* WITH_CONTIKI || RIOT_VERSION */
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#endif
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#ifndef DTLS_DEFAULT_MAX_RETRANSMIT
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/** Number of message retransmissions. */
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#define DTLS_DEFAULT_MAX_RETRANSMIT 7
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#endif
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/** Known cipher suites.*/
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typedef enum {
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TLS_NULL_WITH_NULL_NULL = 0x0000, /**< NULL cipher */
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TLS_PSK_WITH_AES_128_CCM_8 = 0xC0A8, /**< see RFC 6655 */
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TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 = 0xC0AE /**< see RFC 7251 */
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} dtls_cipher_t;
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/** Known compression suites.*/
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typedef enum {
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TLS_COMPRESSION_NULL = 0x0000 /* NULL compression */
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} dtls_compression_t;
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#define TLS_EXT_ELLIPTIC_CURVES 10 /* see RFC 4492 */
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#define TLS_EXT_EC_POINT_FORMATS 11 /* see RFC 4492 */
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#define TLS_EXT_SIG_HASH_ALGO 13 /* see RFC 5246 */
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#define TLS_EXT_CLIENT_CERTIFICATE_TYPE 19 /* see RFC 7250 */
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#define TLS_EXT_SERVER_CERTIFICATE_TYPE 20 /* see RFC 7250 */
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#define TLS_EXT_ENCRYPT_THEN_MAC 22 /* see RFC 7366 */
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#define TLS_EXT_EXTENDED_MASTER_SECRET 23 /* see RFC 7627 */
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#define TLS_CERT_TYPE_RAW_PUBLIC_KEY 2 /* see RFC 7250 */
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#define TLS_EXT_ELLIPTIC_CURVES_SECP256R1 23 /* see RFC 4492 */
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#define TLS_EXT_EC_POINT_FORMATS_UNCOMPRESSED 0 /* see RFC 4492 */
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#define TLS_EC_CURVE_TYPE_NAMED_CURVE 3 /* see RFC 4492 */
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#define TLS_CLIENT_CERTIFICATE_TYPE_ECDSA_SIGN 64 /* see RFC 4492 */
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#define TLS_EXT_SIG_HASH_ALGO_SHA256 4 /* see RFC 5246 */
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#define TLS_EXT_SIG_HASH_ALGO_ECDSA 3 /* see RFC 5246 */
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/**
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* XORs \p n bytes byte-by-byte starting at \p y to the memory area
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* starting at \p x. */
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static inline void
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memxor(unsigned char *x, const unsigned char *y, size_t n) {
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while(n--) {
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*x ^= *y;
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x++; y++;
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}
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}
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/**
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* Compares \p len bytes from @p a with @p b in constant time. This
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* functions always traverses the entire length to prevent timing
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* attacks.
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*
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* \param a Byte sequence to compare
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* \param b Byte sequence to compare
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* \param len Number of bytes to compare.
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* \return \c 1 if \p a and \p b are equal, \c 0 otherwise.
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*/
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static inline int
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equals(unsigned char *a, unsigned char *b, size_t len) {
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int result = 1;
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while (len--) {
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result &= (*a++ == *b++);
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}
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return result;
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}
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#ifdef HAVE_FLS
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#define dtls_fls(i) fls(i)
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#else
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static inline int
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dtls_fls(unsigned int i) {
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int n;
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for (n = 0; i; n++)
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i >>= 1;
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return n;
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}
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#endif /* HAVE_FLS */
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#undef uthash_fatal
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#define uthash_fatal(msg) return(-1) /* fatal error in uthash */
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#endif /* _DTLS_GLOBAL_H_ */
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