214 lines
7.8 KiB
C
214 lines
7.8 KiB
C
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/**
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* \file cmac.h
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*
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* \brief This file contains CMAC definitions and functions.
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*
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* The Cipher-based Message Authentication Code (CMAC) Mode for
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* Authentication is defined in <em>RFC-4493: The AES-CMAC Algorithm</em>.
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*/
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/*
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* Copyright (C) 2015-2018, Arm Limited (or its affiliates), All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of Mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_CMAC_H
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#define MBEDTLS_CMAC_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "cipher.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED is deprecated and should not be used. */
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#define MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED -0x007A /**< CMAC hardware accelerator failed. */
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#define MBEDTLS_AES_BLOCK_SIZE 16
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#define MBEDTLS_DES3_BLOCK_SIZE 8
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#if defined(MBEDTLS_AES_C)
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#define MBEDTLS_CIPHER_BLKSIZE_MAX 16 /**< The longest block used by CMAC is that of AES. */
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#else
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#define MBEDTLS_CIPHER_BLKSIZE_MAX 8 /**< The longest block used by CMAC is that of 3DES. */
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#endif
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#if !defined(MBEDTLS_CMAC_ALT)
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/**
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* The CMAC context structure.
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*/
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struct mbedtls_cmac_context_t
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{
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/** The internal state of the CMAC algorithm. */
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unsigned char state[MBEDTLS_CIPHER_BLKSIZE_MAX];
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/** Unprocessed data - either data that was not block aligned and is still
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* pending processing, or the final block. */
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unsigned char unprocessed_block[MBEDTLS_CIPHER_BLKSIZE_MAX];
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/** The length of data pending processing. */
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size_t unprocessed_len;
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};
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#else /* !MBEDTLS_CMAC_ALT */
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#include "cmac_alt.h"
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#endif /* !MBEDTLS_CMAC_ALT */
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/**
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* \brief This function sets the CMAC key, and prepares to authenticate
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* the input data.
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* Must be called with an initialized cipher context.
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*
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* \param ctx The cipher context used for the CMAC operation, initialized
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* as one of the following types: MBEDTLS_CIPHER_AES_128_ECB,
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* MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_CIPHER_AES_256_ECB,
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* or MBEDTLS_CIPHER_DES_EDE3_ECB.
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* \param key The CMAC key.
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* \param keybits The length of the CMAC key in bits.
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* Must be supported by the cipher.
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*
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* \return \c 0 on success.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_cmac_starts( mbedtls_cipher_context_t *ctx,
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const unsigned char *key, size_t keybits );
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/**
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* \brief This function feeds an input buffer into an ongoing CMAC
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* computation.
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*
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* It is called between mbedtls_cipher_cmac_starts() or
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* mbedtls_cipher_cmac_reset(), and mbedtls_cipher_cmac_finish().
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* Can be called repeatedly.
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*
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* \param ctx The cipher context used for the CMAC operation.
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* \param input The buffer holding the input data.
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* \param ilen The length of the input data.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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* if parameter verification fails.
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*/
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int mbedtls_cipher_cmac_update( mbedtls_cipher_context_t *ctx,
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const unsigned char *input, size_t ilen );
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/**
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* \brief This function finishes the CMAC operation, and writes
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* the result to the output buffer.
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*
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* It is called after mbedtls_cipher_cmac_update().
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* It can be followed by mbedtls_cipher_cmac_reset() and
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* mbedtls_cipher_cmac_update(), or mbedtls_cipher_free().
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*
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* \param ctx The cipher context used for the CMAC operation.
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* \param output The output buffer for the CMAC checksum result.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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* if parameter verification fails.
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*/
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int mbedtls_cipher_cmac_finish( mbedtls_cipher_context_t *ctx,
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unsigned char *output );
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/**
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* \brief This function prepares the authentication of another
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* message with the same key as the previous CMAC
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* operation.
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*
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* It is called after mbedtls_cipher_cmac_finish()
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* and before mbedtls_cipher_cmac_update().
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*
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* \param ctx The cipher context used for the CMAC operation.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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* if parameter verification fails.
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*/
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int mbedtls_cipher_cmac_reset( mbedtls_cipher_context_t *ctx );
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/**
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* \brief This function calculates the full generic CMAC
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* on the input buffer with the provided key.
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*
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* The function allocates the context, performs the
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* calculation, and frees the context.
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*
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* The CMAC result is calculated as
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* output = generic CMAC(cmac key, input buffer).
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*
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*
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* \param cipher_info The cipher information.
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* \param key The CMAC key.
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* \param keylen The length of the CMAC key in bits.
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* \param input The buffer holding the input data.
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* \param ilen The length of the input data.
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* \param output The buffer for the generic CMAC result.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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* if parameter verification fails.
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*/
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int mbedtls_cipher_cmac( const mbedtls_cipher_info_t *cipher_info,
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const unsigned char *key, size_t keylen,
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const unsigned char *input, size_t ilen,
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unsigned char *output );
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#if defined(MBEDTLS_AES_C)
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/**
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* \brief This function implements the AES-CMAC-PRF-128 pseudorandom
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* function, as defined in
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* <em>RFC-4615: The Advanced Encryption Standard-Cipher-based
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* Message Authentication Code-Pseudo-Random Function-128
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* (AES-CMAC-PRF-128) Algorithm for the Internet Key
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* Exchange Protocol (IKE).</em>
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*
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* \param key The key to use.
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* \param key_len The key length in Bytes.
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* \param input The buffer holding the input data.
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* \param in_len The length of the input data in Bytes.
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* \param output The buffer holding the generated 16 Bytes of
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* pseudorandom output.
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*
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* \return \c 0 on success.
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*/
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int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_len,
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const unsigned char *input, size_t in_len,
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unsigned char output[16] );
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#endif /* MBEDTLS_AES_C */
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#if defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) )
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/**
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* \brief The CMAC checkup routine.
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*
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* \return \c 0 on success.
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* \return \c 1 on failure.
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*/
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int mbedtls_cmac_self_test( int verbose );
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#endif /* MBEDTLS_SELF_TEST && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_CMAC_H */
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