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309 lines
14 KiB
C
309 lines
14 KiB
C
/**
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* \file ccm.h
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*
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* \brief This file provides an API for the CCM authenticated encryption
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* mode for block ciphers.
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*
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* 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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* Definition of CCM:
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* http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
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* RFC 3610 "Counter with CBC-MAC (CCM)"
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*
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* Related:
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* RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
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*
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* Definition of CCM*:
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* IEEE 802.15.4 - IEEE Standard for Local and metropolitan area networks
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* Integer representation is fixed most-significant-octet-first order and
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* the representation of octets is most-significant-bit-first order. This is
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* consistent with RFC 3610.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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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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#ifndef MBEDTLS_CCM_H
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#define MBEDTLS_CCM_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/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 "mbedtls/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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/* MBEDTLS_ERR_CCM_HW_ACCEL_FAILED is deprecated and should not be used. */
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#define MBEDTLS_ERR_CCM_HW_ACCEL_FAILED -0x0011 /**< CCM hardware accelerator failed. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_CCM_ALT)
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// Regular implementation
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//
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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 mbedtls_ccm_context
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{
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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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#else /* MBEDTLS_CCM_ALT */
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#include "ccm_alt.h"
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#endif /* MBEDTLS_CCM_ALT */
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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. This must not be \c NULL.
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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. This must be an initialized
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* context.
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* \param cipher The 128-bit block cipher to use.
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* \param key The encryption key. This must not be \c NULL.
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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.
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* \return A CCM or cipher-specific error code on failure.
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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. If this is \c NULL, the function
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* has no effect. Otherwise, this must be initialized.
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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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* \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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* \param ctx The CCM context to use for encryption. This must be
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* initialized and bound to a key.
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* \param length The length of the input data in Bytes.
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* \param iv The initialization vector (nonce). This must be a readable
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* buffer of at least \p iv_len Bytes.
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* \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
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* or 13. The length L of the message length field is
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* 15 - \p iv_len.
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* \param add The additional data field. If \p add_len is greater than
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* zero, \p add must be a readable buffer of at least that
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* length.
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* \param add_len The length of additional data in Bytes.
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* This must be less than `2^16 - 2^8`.
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* \param input The buffer holding the input data. If \p length is greater
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* than zero, \p input must be a readable buffer of at least
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* that length.
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* \param output The buffer holding the output data. If \p length is greater
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* than zero, \p output must be a writable buffer of at least
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* that length.
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* \param tag The buffer holding the authentication field. This must be a
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* writable buffer of at least \p tag_len Bytes.
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* \param tag_len The length of the authentication field to generate in Bytes:
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* 4, 6, 8, 10, 12, 14 or 16.
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*
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* \return \c 0 on success.
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* \return A CCM or cipher-specific error code on failure.
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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 encrypts a buffer using CCM*.
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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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* \note When using this function in a variable tag length context,
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* the tag length has to be encoded into the \p iv passed to
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* this function.
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*
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* \param ctx The CCM context to use for encryption. This must be
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* initialized and bound to a key.
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* \param length The length of the input data in Bytes.
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* \param iv The initialization vector (nonce). This must be a readable
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* buffer of at least \p iv_len Bytes.
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* \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
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* or 13. The length L of the message length field is
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* 15 - \p iv_len.
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* \param add The additional data field. This must be a readable buffer of
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* at least \p add_len Bytes.
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* \param add_len The length of additional data in Bytes.
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* This must be less than 2^16 - 2^8.
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* \param input The buffer holding the input data. If \p length is greater
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* than zero, \p input must be a readable buffer of at least
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* that length.
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* \param output The buffer holding the output data. If \p length is greater
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* than zero, \p output must be a writable buffer of at least
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* that length.
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* \param tag The buffer holding the authentication field. This must be a
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* writable buffer of at least \p tag_len Bytes.
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* \param tag_len The length of the authentication field to generate in Bytes:
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* 0, 4, 6, 8, 10, 12, 14 or 16.
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*
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* \warning Passing \c 0 as \p tag_len means that the message is no
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* longer authenticated.
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*
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* \return \c 0 on success.
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* \return A CCM or cipher-specific error code on failure.
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*/
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int mbedtls_ccm_star_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. This must be
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* initialized and bound to a key.
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* \param length The length of the input data in Bytes.
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* \param iv The initialization vector (nonce). This must be a readable
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* buffer of at least \p iv_len Bytes.
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* \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
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* or 13. The length L of the message length field is
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* 15 - \p iv_len.
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* \param add The additional data field. This must be a readable buffer
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* of at least that \p add_len Bytes..
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* \param add_len The length of additional data in Bytes.
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* This must be less than 2^16 - 2^8.
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* \param input The buffer holding the input data. If \p length is greater
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* than zero, \p input must be a readable buffer of at least
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* that length.
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* \param output The buffer holding the output data. If \p length is greater
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* than zero, \p output must be a writable buffer of at least
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* that length.
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* \param tag The buffer holding the authentication field. This must be a
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* readable buffer of at least \p tag_len Bytes.
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* \param tag_len The length of the authentication field to generate in Bytes:
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* 4, 6, 8, 10, 12, 14 or 16.
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*
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* \return \c 0 on success. This indicates that the message is authentic.
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* \return #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match.
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* \return A cipher-specific error code on calculation failure.
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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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/**
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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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* \note When using this function in a variable tag length context,
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* the tag length has to be decoded from \p iv and passed to
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* this function as \p tag_len. (\p tag needs to be adjusted
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* accordingly.)
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*
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* \param ctx The CCM context to use for decryption. This must be
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* initialized and bound to a key.
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* \param length The length of the input data in Bytes.
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* \param iv The initialization vector (nonce). This must be a readable
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* buffer of at least \p iv_len Bytes.
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* \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
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* or 13. The length L of the message length field is
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* 15 - \p iv_len.
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* \param add The additional data field. This must be a readable buffer of
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* at least that \p add_len Bytes.
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* \param add_len The length of additional data in Bytes.
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* This must be less than 2^16 - 2^8.
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* \param input The buffer holding the input data. If \p length is greater
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* than zero, \p input must be a readable buffer of at least
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* that length.
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* \param output The buffer holding the output data. If \p length is greater
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* than zero, \p output must be a writable buffer of at least
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* that length.
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* \param tag The buffer holding the authentication field. This must be a
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* readable buffer of at least \p tag_len Bytes.
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* \param tag_len The length of the authentication field in Bytes.
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* 0, 4, 6, 8, 10, 12, 14 or 16.
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*
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* \warning Passing \c 0 as \p tag_len means that the message is nos
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* longer authenticated.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match.
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* \return A cipher-specific error code on calculation failure.
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*/
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int mbedtls_ccm_star_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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#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.
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* \return \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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