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https://github.com/zephyrproject-rtos/zephyr
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76a42daaa9
This is originally from git@github.com:YanziNetworks/tinyDTLS.git commit d7ca5120e7e853f76e9743db2a0236a26ba71363 Change-Id: I6e6c2da76e11b473ead1b0ddac929f8bd670d7e3 Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
/* dtls -- a very basic DTLS implementation
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*
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* Copyright (C) 2011--2012 Olaf Bergmann <bergmann@tzi.org>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _DTLS_CCM_H_
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#define _DTLS_CCM_H_
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#include "aes/rijndael.h"
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/* implementation of Counter Mode CBC-MAC, RFC 3610 */
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#define DTLS_CCM_BLOCKSIZE 16 /**< size of hmac blocks */
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#define DTLS_CCM_MAX 16 /**< max number of bytes in digest */
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#define DTLS_CCM_NONCE_SIZE 12 /**< size of nonce */
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/**
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* Authenticates and encrypts a message using AES in CCM mode. Please
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* see also RFC 3610 for the meaning of \p M, \p L, \p lm and \p la.
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*
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* \param ctx The initialized rijndael_ctx object to be used for AES operations.
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* \param M The number of authentication octets.
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* \param L The number of bytes used to encode the message length.
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* \param N The nonce value to use. You must provide \c DTLS_CCM_BLOCKSIZE
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* nonce octets, although only the first \c 16 - \p L are used.
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* \param msg The message to encrypt. The first \p la octets are additional
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* authentication data that will be cleartext. Note that the
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* encryption operation modifies the contents of \p msg and adds
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* \p M bytes MAC. Therefore, the buffer must be at least
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* \p lm + \p M bytes large.
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* \param lm The actual length of \p msg.
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* \param aad A pointer to the additional authentication data (can be \c NULL if
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* \p la is zero).
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* \param la The number of additional authentication octets (may be zero).
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* \return FIXME
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*/
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long int
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dtls_ccm_encrypt_message(rijndael_ctx *ctx, size_t M, size_t L,
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unsigned char nonce[DTLS_CCM_BLOCKSIZE],
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unsigned char *msg, size_t lm,
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const unsigned char *aad, size_t la);
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long int
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dtls_ccm_decrypt_message(rijndael_ctx *ctx, size_t M, size_t L,
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unsigned char nonce[DTLS_CCM_BLOCKSIZE],
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unsigned char *msg, size_t lm,
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const unsigned char *aad, size_t la);
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#endif /* _DTLS_CCM_H_ */
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