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/**
* \file cmac.h
*
* \brief This file contains CMAC definitions and functions.
*
* The Cipher-based Message Authentication Code (CMAC) Mode for
* Authentication is defined in <em>RFC-4493: The AES-CMAC Algorithm</em>.
*/
/*
* Copyright The Mbed TLS Contributors
* 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.
*/
#ifndef MBEDTLS_CMAC_H
#define MBEDTLS_CMAC_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include "mbedtls/cipher.h"
#ifdef __cplusplus
extern "C" {
#endif
/* MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED is deprecated and should not be used. */
/** CMAC hardware accelerator failed. */
#define MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED -0x007A
#define MBEDTLS_AES_BLOCK_SIZE 16
#define MBEDTLS_DES3_BLOCK_SIZE 8
#if defined(MBEDTLS_AES_C)
#define MBEDTLS_CIPHER_BLKSIZE_MAX 16 /**< The longest block used by CMAC is that of AES. */
#else
#define MBEDTLS_CIPHER_BLKSIZE_MAX 8 /**< The longest block used by CMAC is that of 3DES. */
#endif
#if !defined(MBEDTLS_CMAC_ALT)
/**
* The CMAC context structure.
*/
struct mbedtls_cmac_context_t
{
/** The internal state of the CMAC algorithm. */
unsigned char state[MBEDTLS_CIPHER_BLKSIZE_MAX];
/** Unprocessed data - either data that was not block aligned and is still
* pending processing, or the final block. */
unsigned char unprocessed_block[MBEDTLS_CIPHER_BLKSIZE_MAX];
/** The length of data pending processing. */
size_t unprocessed_len;
};
#else /* !MBEDTLS_CMAC_ALT */
#include "cmac_alt.h"
#endif /* !MBEDTLS_CMAC_ALT */
/**
* \brief This function starts a new CMAC computation
* by setting the CMAC key, and preparing to authenticate
* the input data.
* It must be called with an initialized cipher context.
*
* Once this function has completed, data can be supplied
* to the CMAC computation by calling
* mbedtls_cipher_cmac_update().
*
* To start a CMAC computation using the same key as a previous
* CMAC computation, use mbedtls_cipher_cmac_finish().
*
* \note When the CMAC implementation is supplied by an alternate
* implementation (through #MBEDTLS_CMAC_ALT), some ciphers
* may not be supported by that implementation, and thus
* return an error. Alternate implementations must support
* AES-128 and AES-256, and may support AES-192 and 3DES.
*
* \param ctx The cipher context used for the CMAC operation, initialized
* as one of the following types: MBEDTLS_CIPHER_AES_128_ECB,
* MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_CIPHER_AES_256_ECB,
* or MBEDTLS_CIPHER_DES_EDE3_ECB.
* \param key The CMAC key.
* \param keybits The length of the CMAC key in bits.
* Must be supported by the cipher.
*
* \return \c 0 on success.
* \return A cipher-specific error code on failure.
*/
int mbedtls_cipher_cmac_starts( mbedtls_cipher_context_t *ctx,
const unsigned char *key, size_t keybits );
/**
* \brief This function feeds an input buffer into an ongoing CMAC
* computation.
*
* The CMAC computation must have previously been started
* by calling mbedtls_cipher_cmac_starts() or
* mbedtls_cipher_cmac_reset().
*
* Call this function as many times as needed to input the
* data to be authenticated.
* Once all of the required data has been input,
* call mbedtls_cipher_cmac_finish() to obtain the result
* of the CMAC operation.
*
* \param ctx The cipher context used for the CMAC operation.
* \param input The buffer holding the input data.
* \param ilen The length of the input data.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
* if parameter verification fails.
*/
int mbedtls_cipher_cmac_update( mbedtls_cipher_context_t *ctx,
const unsigned char *input, size_t ilen );
/**
* \brief This function finishes an ongoing CMAC operation, and
* writes the result to the output buffer.
*
* It should be followed either by
* mbedtls_cipher_cmac_reset(), which starts another CMAC
* operation with the same key, or mbedtls_cipher_free(),
* which clears the cipher context.
*
* \param ctx The cipher context used for the CMAC operation.
* \param output The output buffer for the CMAC checksum result.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
* if parameter verification fails.
*/
int mbedtls_cipher_cmac_finish( mbedtls_cipher_context_t *ctx,
unsigned char *output );
/**
* \brief This function starts a new CMAC operation with the same
* key as the previous one.
*
* It should be called after finishing the previous CMAC
* operation with mbedtls_cipher_cmac_finish().
* After calling this function,
* call mbedtls_cipher_cmac_update() to supply the new
* CMAC operation with data.
*
* \param ctx The cipher context used for the CMAC operation.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
* if parameter verification fails.
*/
int mbedtls_cipher_cmac_reset( mbedtls_cipher_context_t *ctx );
/**
* \brief This function calculates the full generic CMAC
* on the input buffer with the provided key.
*
* The function allocates the context, performs the
* calculation, and frees the context.
*
* The CMAC result is calculated as
* output = generic CMAC(cmac key, input buffer).
*
* \note When the CMAC implementation is supplied by an alternate
* implementation (through #MBEDTLS_CMAC_ALT), some ciphers
* may not be supported by that implementation, and thus
* return an error. Alternate implementations must support
* AES-128 and AES-256, and may support AES-192 and 3DES.
*
* \param cipher_info The cipher information.
* \param key The CMAC key.
* \param keylen The length of the CMAC key in bits.
* \param input The buffer holding the input data.
* \param ilen The length of the input data.
* \param output The buffer for the generic CMAC result.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
* if parameter verification fails.
*/
int mbedtls_cipher_cmac( const mbedtls_cipher_info_t *cipher_info,
const unsigned char *key, size_t keylen,
const unsigned char *input, size_t ilen,
unsigned char *output );
#if defined(MBEDTLS_AES_C)
/**
* \brief This function implements the AES-CMAC-PRF-128 pseudorandom
* function, as defined in
* <em>RFC-4615: The Advanced Encryption Standard-Cipher-based
* Message Authentication Code-Pseudo-Random Function-128
* (AES-CMAC-PRF-128) Algorithm for the Internet Key
* Exchange Protocol (IKE).</em>
*
* \param key The key to use.
* \param key_len The key length in Bytes.
* \param input The buffer holding the input data.
* \param in_len The length of the input data in Bytes.
* \param output The buffer holding the generated 16 Bytes of
* pseudorandom output.
*
* \return \c 0 on success.
*/
int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_len,
const unsigned char *input, size_t in_len,
unsigned char output[16] );
#endif /* MBEDTLS_AES_C */
#if defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) )
/**
* \brief The CMAC checkup routine.
*
* \note In case the CMAC routines are provided by an alternative
* implementation (i.e. #MBEDTLS_CMAC_ALT is defined), the
* checkup routine will succeed even if the implementation does
* not support the less widely used AES-192 or 3DES primitives.
* The self-test requires at least AES-128 and AES-256 to be
* supported by the underlying implementation.
*
* \return \c 0 on success.
* \return \c 1 on failure.
*/
int mbedtls_cmac_self_test( int verbose );
#endif /* MBEDTLS_SELF_TEST && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
#ifdef __cplusplus
}
#endif
#endif /* MBEDTLS_CMAC_H */
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