Ashley Mills / tinydtls_0_4_0

mbed port of tinydtls

ccm.h@1:bc8a649bad13, 2013-10-11 (annotated)

Committer:
ashleymills
Date:
Fri Oct 11 08:46:21 2013 +0000
Revision:
1:bc8a649bad13
Parent:
0:04990d454f45 
Cleaned up all the debug stuff I added finding the hash table bug.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ashleymills 0:04990d454f45 1 /* dtls -- a very basic DTLS implementation
ashleymills 0:04990d454f45 2 *
ashleymills 0:04990d454f45 3 * Copyright (C) 2011--2012 Olaf Bergmann <bergmann@tzi.org>
ashleymills 0:04990d454f45 4 *
ashleymills 0:04990d454f45 5 * Permission is hereby granted, free of charge, to any person
ashleymills 0:04990d454f45 6 * obtaining a copy of this software and associated documentation
ashleymills 0:04990d454f45 7 * files (the "Software"), to deal in the Software without
ashleymills 0:04990d454f45 8 * restriction, including without limitation the rights to use, copy,
ashleymills 0:04990d454f45 9 * modify, merge, publish, distribute, sublicense, and/or sell copies
ashleymills 0:04990d454f45 10 * of the Software, and to permit persons to whom the Software is
ashleymills 0:04990d454f45 11 * furnished to do so, subject to the following conditions:
ashleymills 0:04990d454f45 12 *
ashleymills 0:04990d454f45 13 * The above copyright notice and this permission notice shall be
ashleymills 0:04990d454f45 14 * included in all copies or substantial portions of the Software.
ashleymills 0:04990d454f45 15 *
ashleymills 0:04990d454f45 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
ashleymills 0:04990d454f45 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
ashleymills 0:04990d454f45 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
ashleymills 0:04990d454f45 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
ashleymills 0:04990d454f45 20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ashleymills 0:04990d454f45 21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
ashleymills 0:04990d454f45 22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
ashleymills 0:04990d454f45 23 * SOFTWARE.
ashleymills 0:04990d454f45 24 */
ashleymills 0:04990d454f45 25
ashleymills 0:04990d454f45 26 #ifndef _CCM_H_
ashleymills 0:04990d454f45 27 #define _CCM_H_
ashleymills 0:04990d454f45 28
ashleymills 0:04990d454f45 29 #include "config.h"
ashleymills 0:04990d454f45 30 #include "aes/rijndael.h"
ashleymills 0:04990d454f45 31
ashleymills 0:04990d454f45 32 /* implementation of Counter Mode CBC-MAC, RFC 3610 */
ashleymills 0:04990d454f45 33
ashleymills 0:04990d454f45 34 #define DTLS_CCM_BLOCKSIZE 16 /**< size of hmac blocks */
ashleymills 0:04990d454f45 35 #define DTLS_CCM_MAX 16 /**< max number of bytes in digest */
ashleymills 0:04990d454f45 36 #define DTLS_CCM_NONCE_SIZE 12 /**< size of nonce */
ashleymills 0:04990d454f45 37
ashleymills 0:04990d454f45 38 /**
ashleymills 0:04990d454f45 39 * Authenticates and encrypts a message using AES in CCM mode. Please
ashleymills 0:04990d454f45 40 * see also RFC 3610 for the meaning of \p M, \p L, \p lm and \p la.
ashleymills 0:04990d454f45 41 *
ashleymills 0:04990d454f45 42 * \param ctx The initialized rijndael_ctx object to be used for AES operations.
ashleymills 0:04990d454f45 43 * \param M The number of authentication octets.
ashleymills 0:04990d454f45 44 * \param L The number of bytes used to encode the message length.
ashleymills 0:04990d454f45 45 * \param N The nonce value to use. You must provide \c DTLS_CCM_BLOCKSIZE
ashleymills 0:04990d454f45 46 * nonce octets, although only the first \c 16 - \p L are used.
ashleymills 0:04990d454f45 47 * \param msg The message to encrypt. The first \p la octets are additional
ashleymills 0:04990d454f45 48 * authentication data that will be cleartext. Note that the
ashleymills 0:04990d454f45 49 * encryption operation modifies the contents of \p msg and adds
ashleymills 0:04990d454f45 50 * \p M bytes MAC. Therefore, the buffer must be at least
ashleymills 0:04990d454f45 51 * \p lm + \p M bytes large.
ashleymills 0:04990d454f45 52 * \param lm The actual length of \p msg.
ashleymills 0:04990d454f45 53 * \param aad A pointer to the additional authentication data (can be \c NULL if
ashleymills 0:04990d454f45 54 * \p la is zero).
ashleymills 0:04990d454f45 55 * \param la The number of additional authentication octets (may be zero).
ashleymills 0:04990d454f45 56 * \return FIXME
ashleymills 0:04990d454f45 57 */
ashleymills 0:04990d454f45 58 long int
ashleymills 0:04990d454f45 59 dtls_ccm_encrypt_message(rijndael_ctx *ctx, size_t M, size_t L,
ashleymills 0:04990d454f45 60 unsigned char N[DTLS_CCM_BLOCKSIZE],
ashleymills 0:04990d454f45 61 unsigned char *msg, size_t lm,
ashleymills 0:04990d454f45 62 const unsigned char *aad, size_t la);
ashleymills 0:04990d454f45 63
ashleymills 0:04990d454f45 64 long int
ashleymills 0:04990d454f45 65 dtls_ccm_decrypt_message(rijndael_ctx *ctx, size_t M, size_t L,
ashleymills 0:04990d454f45 66 unsigned char N[DTLS_CCM_BLOCKSIZE],
ashleymills 0:04990d454f45 67 unsigned char *msg, size_t lm,
ashleymills 0:04990d454f45 68 const unsigned char *aad, size_t la);
ashleymills 0:04990d454f45 69
ashleymills 0:04990d454f45 70 #endif /* _CCM_H_ */