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/**
* \file cmac.h
*
* \brief The CMAC Mode for Authentication
*
* Copyright (C) 2006-2016, 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)
*/
#ifndef MBEDTLS_CMAC_H
#define MBEDTLS_CMAC_H
#include "cipher.h"
#define MBEDTLS_ERR_CMAC_BAD_INPUT -0x0011 /**< Bad input parameters to function. */
#define MBEDTLS_ERR_CMAC_VERIFY_FAILED -0x0013 /**< Verification failed. */
#define MBEDTLS_ERR_CMAC_ALLOC_FAILED -0x0015 /**< Failed to allocate memory */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief CMAC context structure
*/
typedef struct {
mbedtls_cipher_context_t cipher_ctx; /*!< cipher context used */
unsigned char* K1; /*!< CMAC Subkey 1 */
unsigned char* K2; /*!< CMAC Subkey 2 */
}
mbedtls_cmac_context;
/**
* \brief Initialize CMAC context (just makes references valid)
* Makes the context ready for mbedtls_cmac_setkey() or
* mbedtls_cmac_free().
*
* \param ctx CMAC context to initialize
*/
void mbedtls_cmac_init( mbedtls_cmac_context *ctx );
/**
* \brief Initialize the CMAC context
*
* \param ctx CMAC context to be initialized
* \param cipher cipher to use.
Cipher block size must be 8 bytes or 16 bytes.
* \param key encryption key
* \param keybits encryption key size in bits (must be acceptable by the cipher)
*
* \return 0 if successful, or a cipher specific error code
*/
int mbedtls_cmac_setkey( mbedtls_cmac_context *ctx,
mbedtls_cipher_id_t cipher,
const unsigned char *key,
unsigned int keybits );
/**
* \brief Free a CMAC context and underlying cipher sub-context
* Securely wipes sub keys and other sensitive data.
*
* \param ctx CMAC context to free
*/
void mbedtls_cmac_free( mbedtls_cmac_context *ctx );
/**
* \brief Generate a CMAC tag.
*
* \param ctx CMAC context
* \param input buffer holding the input data
* \param in_len length of the input data in bytes
* \param tag buffer for holding the generated tag
* \param tag_len length of the tag to generate in bytes
* Must be 2, 4, 6, 8 if cipher block size is 8
* Must be 2, 4, 6, 8, 10, 12, 14 or 16 if cipher block size is 16
*
* \return 0 if successful
*/
int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
const unsigned char *input, size_t in_len,
unsigned char *tag, size_t tag_len );
/**
* \brief Verify a CMAC tag.
*
* \param ctx CMAC context
* \param input buffer holding the input data
* \param in_len length of the input data in bytes
* \param tag buffer holding the tag to verify
* \param tag_len length of the tag to verify in bytes
* Must be 2, 4, 6, 8 if cipher block size is 8
* Must be 2, 4, 6, 8, 10, 12, 14 or 16 if cipher block size is 16
* \return 0 if successful and authenticated
* MBEDTLS_ERR_CMAC_VERIFY_FAILED if tag does not match
*/
int mbedtls_cmac_verify( mbedtls_cmac_context *ctx,
const unsigned char *input, size_t in_len,
const unsigned char *tag, size_t tag_len );
#ifdef MBEDTLS_AES_C
/**
* \brief AES-CMAC-128-PRF
* See RFC 4615 for details
*
* \param key PRF key
* \param key_len PRF key length
* \param input buffer holding the input data
* \param in_len length of the input data in bytes
* \param tag buffer holding the generated pseudorandom output
*
* \return 0 if successful
*/
int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_len,
const unsigned char *input, size_t in_len,
unsigned char tag[16] );
#endif /* MBEDTLS_AES_C */
#if defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) )
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int mbedtls_cmac_self_test( int verbose );
#endif /* MBEDTLS_SELF_TEST && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
#ifdef __cplusplus
}
#endif
#endif /* MBEDTLS_CMAC_H */