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533 lines
25 KiB
C
533 lines
25 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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#include "mbedtls/private_access.h"
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#include "mbedtls/build_info.h"
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#include "mbedtls/cipher.h"
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#define MBEDTLS_CCM_DECRYPT 0
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#define MBEDTLS_CCM_ENCRYPT 1
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#define MBEDTLS_CCM_STAR_DECRYPT 2
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#define MBEDTLS_CCM_STAR_ENCRYPT 3
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/** Bad input parameters to the function. */
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#define MBEDTLS_ERR_CCM_BAD_INPUT -0x000D
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/** Authenticated decryption failed. */
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#define MBEDTLS_ERR_CCM_AUTH_FAILED -0x000F
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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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unsigned char MBEDTLS_PRIVATE(y)[16]; /*!< The Y working buffer */
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unsigned char MBEDTLS_PRIVATE(ctr)[16]; /*!< The counter buffer */
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mbedtls_cipher_context_t MBEDTLS_PRIVATE(cipher_ctx); /*!< The cipher context used. */
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size_t MBEDTLS_PRIVATE(plaintext_len); /*!< Total plaintext length */
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size_t MBEDTLS_PRIVATE(add_len); /*!< Total authentication data length */
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size_t MBEDTLS_PRIVATE(tag_len); /*!< Total tag length */
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size_t MBEDTLS_PRIVATE(processed); /*!< Track how many bytes of input data
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were processed (chunked input).
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Used independently for both auth data
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and plaintext/ciphertext.
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This variable is set to zero after
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auth data input is finished. */
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unsigned char MBEDTLS_PRIVATE(q); /*!< The Q working value */
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unsigned char MBEDTLS_PRIVATE(mode); /*!< The operation to perform:
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#MBEDTLS_CCM_ENCRYPT or
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#MBEDTLS_CCM_DECRYPT or
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#MBEDTLS_CCM_STAR_ENCRYPT or
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#MBEDTLS_CCM_STAR_DECRYPT. */
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int MBEDTLS_PRIVATE(state); /*!< Working value holding context's
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state. Used for chunked data
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input */
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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 ad The additional data field. If \p ad_len is greater than
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* zero, \p ad must be a readable buffer of at least that
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* length.
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* \param ad_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 *ad, size_t ad_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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* For tag length = 0, input length is ignored.
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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 ad The additional data field. This must be a readable buffer of
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* at least \p ad_len Bytes.
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* \param ad_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 *ad, size_t ad_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 ad The additional data field. This must be a readable buffer
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* of at least that \p ad_len Bytes..
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* \param ad_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 *ad, size_t ad_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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* For tag length = 0, input length is ignored.
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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 ad The additional data field. This must be a readable buffer of
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* at least that \p ad_len Bytes.
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* \param ad_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 *ad, size_t ad_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 starts a CCM encryption or decryption
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* operation.
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*
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* This function and mbedtls_ccm_set_lengths() must be called
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* before calling mbedtls_ccm_update_ad() or
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* mbedtls_ccm_update(). This function can be called before
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* or after mbedtls_ccm_set_lengths().
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*
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* \note This function is not implemented in Mbed TLS yet.
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*
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* \param ctx The CCM context. This must be initialized.
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* \param mode The operation to perform: #MBEDTLS_CCM_ENCRYPT or
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* #MBEDTLS_CCM_DECRYPT or #MBEDTLS_CCM_STAR_ENCRYPT or
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* #MBEDTLS_CCM_STAR_DECRYPT.
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* \param iv The initialization vector. This must be a readable buffer
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* 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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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
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* \p ctx is in an invalid state,
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* \p mode is invalid,
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* \p iv_len is invalid (lower than \c 7 or greater than
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* \c 13).
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*/
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int mbedtls_ccm_starts( mbedtls_ccm_context *ctx,
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int mode,
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const unsigned char *iv,
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size_t iv_len );
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/**
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* \brief This function declares the lengths of the message
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* and additional data for a CCM encryption or decryption
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* operation.
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*
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* This function and mbedtls_ccm_starts() must be called
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* before calling mbedtls_ccm_update_ad() or
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* mbedtls_ccm_update(). This function can be called before
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* or after mbedtls_ccm_starts().
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*
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* \note This function is not implemented in Mbed TLS yet.
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*
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* \param ctx The CCM context. This must be initialized.
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* \param total_ad_len The total length of additional data in bytes.
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* This must be less than `2^16 - 2^8`.
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* \param plaintext_len The length in bytes of the plaintext to encrypt or
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* result of the decryption (thus not encompassing the
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* additional data that are not encrypted).
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* \param tag_len The length of the tag to generate in Bytes:
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* 4, 6, 8, 10, 12, 14 or 16.
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* For CCM*, zero is also valid.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
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* \p ctx is in an invalid state,
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* \p total_ad_len is greater than \c 0xFF00.
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*/
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int mbedtls_ccm_set_lengths( mbedtls_ccm_context *ctx,
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size_t total_ad_len,
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size_t plaintext_len,
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size_t tag_len );
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/**
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* \brief This function feeds an input buffer as associated data
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* (authenticated but not encrypted data) in a CCM
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* encryption or decryption operation.
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*
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* You may call this function zero, one or more times
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* to pass successive parts of the additional data. The
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* lengths \p ad_len of the data parts should eventually add
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* up exactly to the total length of additional data
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* \c total_ad_len passed to mbedtls_ccm_set_lengths(). You
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* may not call this function after calling
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* mbedtls_ccm_update().
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*
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* \note This function is not implemented in Mbed TLS yet.
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*
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* \param ctx The CCM context. This must have been started with
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* mbedtls_ccm_starts(), the lengths of the message and
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* additional data must have been declared with
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* mbedtls_ccm_set_lengths() and this must not have yet
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* received any input with mbedtls_ccm_update().
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* \param ad The buffer holding the additional data, or \c NULL
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* if \p ad_len is \c 0.
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* \param ad_len The length of the additional data. If \c 0,
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* \p ad may be \c NULL.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
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* \p ctx is in an invalid state,
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* total input length too long.
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*/
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int mbedtls_ccm_update_ad( mbedtls_ccm_context *ctx,
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const unsigned char *ad,
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size_t ad_len );
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/**
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* \brief This function feeds an input buffer into an ongoing CCM
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* encryption or decryption operation.
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*
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* You may call this function zero, one or more times
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* to pass successive parts of the input: the plaintext to
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* encrypt, or the ciphertext (not including the tag) to
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* decrypt. After the last part of the input, call
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* mbedtls_ccm_finish(). The lengths \p input_len of the
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* data parts should eventually add up exactly to the
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* plaintext length \c plaintext_len passed to
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* mbedtls_ccm_set_lengths().
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*
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* This function may produce output in one of the following
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* ways:
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* - Immediate output: the output length is always equal
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* to the input length.
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* - Buffered output: except for the last part of input data,
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* the output consists of a whole number of 16-byte blocks.
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* If the total input length so far (not including
|
|
* associated data) is 16 \* *B* + *A* with *A* < 16 then
|
|
* the total output length is 16 \* *B*.
|
|
* For the last part of input data, the output length is
|
|
* equal to the input length plus the number of bytes (*A*)
|
|
* buffered in the previous call to the function (if any).
|
|
* The function uses the plaintext length
|
|
* \c plaintext_len passed to mbedtls_ccm_set_lengths()
|
|
* to detect the last part of input data.
|
|
*
|
|
* In particular:
|
|
* - It is always correct to call this function with
|
|
* \p output_size >= \p input_len + 15.
|
|
* - If \p input_len is a multiple of 16 for all the calls
|
|
* to this function during an operation (not necessary for
|
|
* the last one) then it is correct to use \p output_size
|
|
* =\p input_len.
|
|
*
|
|
* \note This function is not implemented in Mbed TLS yet.
|
|
*
|
|
* \param ctx The CCM context. This must have been started with
|
|
* mbedtls_ccm_starts() and the lengths of the message and
|
|
* additional data must have been declared with
|
|
* mbedtls_ccm_set_lengths().
|
|
* \param input The buffer holding the input data. If \p input_len
|
|
* is greater than zero, this must be a readable buffer
|
|
* of at least \p input_len bytes.
|
|
* \param input_len The length of the input data in bytes.
|
|
* \param output The buffer for the output data. If \p output_size
|
|
* is greater than zero, this must be a writable buffer of
|
|
* at least \p output_size bytes.
|
|
* \param output_size The size of the output buffer in bytes.
|
|
* See the function description regarding the output size.
|
|
* \param output_len On success, \p *output_len contains the actual
|
|
* length of the output written in \p output.
|
|
* On failure, the content of \p *output_len is
|
|
* unspecified.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
|
|
* \p ctx is in an invalid state,
|
|
* total input length too long,
|
|
* or \p output_size too small.
|
|
*/
|
|
int mbedtls_ccm_update( mbedtls_ccm_context *ctx,
|
|
const unsigned char *input, size_t input_len,
|
|
unsigned char *output, size_t output_size,
|
|
size_t *output_len );
|
|
|
|
/**
|
|
* \brief This function finishes the CCM operation and generates
|
|
* the authentication tag.
|
|
*
|
|
* It wraps up the CCM stream, and generates the
|
|
* tag. The tag can have a maximum length of 16 Bytes.
|
|
*
|
|
* \note This function is not implemented in Mbed TLS yet.
|
|
*
|
|
* \param ctx The CCM context. This must have been started with
|
|
* mbedtls_ccm_starts() and the lengths of the message and
|
|
* additional data must have been declared with
|
|
* mbedtls_ccm_set_lengths().
|
|
* \param tag The buffer for holding the tag. If \p tag_len is greater
|
|
* than zero, this must be a writable buffer of at least \p
|
|
* tag_len Bytes.
|
|
* \param tag_len The length of the tag. Must match the tag length passed to
|
|
* mbedtls_ccm_set_lengths() function.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
|
|
* \p ctx is in an invalid state,
|
|
* invalid value of \p tag_len,
|
|
* the total amount of additional data passed to
|
|
* mbedtls_ccm_update_ad() was lower than the total length of
|
|
* additional data \c total_ad_len passed to
|
|
* mbedtls_ccm_set_lengths(),
|
|
* the total amount of input data passed to
|
|
* mbedtls_ccm_update() was lower than the plaintext length
|
|
* \c plaintext_len passed to mbedtls_ccm_set_lengths().
|
|
*/
|
|
int mbedtls_ccm_finish( mbedtls_ccm_context *ctx,
|
|
unsigned char *tag, size_t tag_len );
|
|
|
|
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
|
|
/**
|
|
* \brief The CCM checkup routine.
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return \c 1 on failure.
|
|
*/
|
|
int mbedtls_ccm_self_test( int verbose );
|
|
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* MBEDTLS_CCM_H */
|