174 lines
6.1 KiB
C
174 lines
6.1 KiB
C
/**
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* \file ccm.h
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*
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* \brief CCM combines Counter mode encryption with CBC-MAC authentication
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* for 128-bit block ciphers.
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*
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* Input to CCM includes the following elements:
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* <ul><li>Payload - data that is both authenticated and encrypted.</li>
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* <li>Associated data (Adata) - data that is authenticated but not
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* encrypted, For example, a header.</li>
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* <li>Nonce - A unique value that is assigned to the payload and the
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* associated data.</li></ul>
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*
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*/
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/*
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* Copyright (C) 2006-2018, 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_CCM_H
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#define MBEDTLS_CCM_H
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#include "cipher.h"
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#define MBEDTLS_ERR_CCM_BAD_INPUT -0x000D /**< Bad input parameters to the function. */
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#define MBEDTLS_ERR_CCM_AUTH_FAILED -0x000F /**< Authenticated decryption failed. */
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#define MBEDTLS_ERR_CCM_HW_ACCEL_FAILED -0x0011 /**< CCM hardware accelerator failed. */
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#if !defined(MBEDTLS_CCM_ALT)
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// Regular implementation
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//
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief The CCM context-type definition. The CCM context is passed
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* to the APIs called.
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*/
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typedef struct {
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mbedtls_cipher_context_t cipher_ctx; /*!< The cipher context used. */
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}
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mbedtls_ccm_context;
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/**
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* \brief This function initializes the specified CCM context,
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* to make references valid, and prepare the context
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* for mbedtls_ccm_setkey() or mbedtls_ccm_free().
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*
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* \param ctx The CCM context to initialize.
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*/
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void mbedtls_ccm_init( mbedtls_ccm_context *ctx );
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/**
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* \brief This function initializes the CCM context set in the
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* \p ctx parameter and sets the encryption key.
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*
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* \param ctx The CCM context to initialize.
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* \param cipher The 128-bit block cipher to use.
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* \param key The encryption key.
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* \param keybits The key size in bits. This must be acceptable by the cipher.
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*
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* \return \c 0 on success, or a cipher-specific error code.
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*/
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int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
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mbedtls_cipher_id_t cipher,
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const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief This function releases and clears the specified CCM context
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* and underlying cipher sub-context.
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*
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* \param ctx The CCM context to clear.
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*/
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void mbedtls_ccm_free( mbedtls_ccm_context *ctx );
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/**
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* \brief This function encrypts a buffer using CCM.
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*
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* \param ctx The CCM context to use for encryption.
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* \param length The length of the input data in Bytes.
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* \param iv Initialization vector (nonce).
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* \param iv_len The length of the IV in Bytes: 7, 8, 9, 10, 11, 12, or 13.
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* \param add The additional data field.
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* \param add_len The length of additional data in Bytes.
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* Must be less than 2^16 - 2^8.
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* \param input The buffer holding the input data.
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* \param output The buffer holding the output data.
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* Must be at least \p length Bytes wide.
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* \param tag The buffer holding the tag.
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* \param tag_len The length of the tag to generate in Bytes:
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* 4, 6, 8, 10, 14 or 16.
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*
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* \note The tag is written to a separate buffer. To concatenate
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* the \p tag with the \p output, as done in <em>RFC-3610:
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* Counter with CBC-MAC (CCM)</em>, use
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* \p tag = \p output + \p length, and make sure that the
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* output buffer is at least \p length + \p tag_len wide.
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*
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* \return \c 0 on success.
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*/
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int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
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const unsigned char *iv, size_t iv_len,
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const unsigned char *add, size_t add_len,
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const unsigned char *input, unsigned char *output,
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unsigned char *tag, size_t tag_len );
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/**
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* \brief This function performs a CCM authenticated decryption of a
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* buffer.
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*
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* \param ctx The CCM context to use for decryption.
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* \param length The length of the input data in Bytes.
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* \param iv Initialization vector.
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* \param iv_len The length of the IV in Bytes: 7, 8, 9, 10, 11, 12, or 13.
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* \param add The additional data field.
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* \param add_len The length of additional data in Bytes.
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* \param input The buffer holding the input data.
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* \param output The buffer holding the output data.
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* \param tag The buffer holding the tag.
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* \param tag_len The length of the tag in Bytes.
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*
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* \return 0 if successful and authenticated, or
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* #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match.
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*/
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int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
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const unsigned char *iv, size_t iv_len,
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const unsigned char *add, size_t add_len,
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const unsigned char *input, unsigned char *output,
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const unsigned char *tag, size_t tag_len );
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#ifdef __cplusplus
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}
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#endif
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#else /* MBEDTLS_CCM_ALT */
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#include "ccm_alt.h"
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#endif /* MBEDTLS_CCM_ALT */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
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/**
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* \brief The CCM checkup routine.
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*
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* \return \c 0 on success, or \c 1 on failure.
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*/
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int mbedtls_ccm_self_test( int verbose );
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#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_CCM_H */
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