| /** |
| * \file ccm.h |
| * |
| * \brief This file provides an API for the CCM authenticated encryption |
| * mode for block ciphers. |
| * |
| * CCM combines Counter mode encryption with CBC-MAC authentication |
| * for 128-bit block ciphers. |
| * |
| * Input to CCM includes the following elements: |
| * <ul><li>Payload - data that is both authenticated and encrypted.</li> |
| * <li>Associated data (Adata) - data that is authenticated but not |
| * encrypted, For example, a header.</li> |
| * <li>Nonce - A unique value that is assigned to the payload and the |
| * associated data.</li></ul> |
| * |
| * Definition of CCM: |
| * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf |
| * RFC 3610 "Counter with CBC-MAC (CCM)" |
| * |
| * Related: |
| * RFC 5116 "An Interface and Algorithms for Authenticated Encryption" |
| * |
| * Definition of CCM*: |
| * IEEE 802.15.4 - IEEE Standard for Local and metropolitan area networks |
| * Integer representation is fixed most-significant-octet-first order and |
| * the representation of octets is most-significant-bit-first order. This is |
| * consistent with RFC 3610. |
| */ |
| /* |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef MBEDTLS_CCM_H |
| #define MBEDTLS_CCM_H |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #include "mbedtls/cipher.h" |
| |
| #define MBEDTLS_ERR_CCM_BAD_INPUT -0x000D /**< Bad input parameters to the function. */ |
| #define MBEDTLS_ERR_CCM_AUTH_FAILED -0x000F /**< Authenticated decryption failed. */ |
| |
| /* MBEDTLS_ERR_CCM_HW_ACCEL_FAILED is deprecated and should not be used. */ |
| #define MBEDTLS_ERR_CCM_HW_ACCEL_FAILED -0x0011 /**< CCM hardware accelerator failed. */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #if !defined(MBEDTLS_CCM_ALT) |
| // Regular implementation |
| // |
| |
| /** |
| * \brief The CCM context-type definition. The CCM context is passed |
| * to the APIs called. |
| */ |
| typedef struct mbedtls_ccm_context |
| { |
| mbedtls_cipher_context_t cipher_ctx; /*!< The cipher context used. */ |
| } |
| mbedtls_ccm_context; |
| |
| #else /* MBEDTLS_CCM_ALT */ |
| #include "ccm_alt.h" |
| #endif /* MBEDTLS_CCM_ALT */ |
| |
| /** |
| * \brief This function initializes the specified CCM context, |
| * to make references valid, and prepare the context |
| * for mbedtls_ccm_setkey() or mbedtls_ccm_free(). |
| * |
| * \param ctx The CCM context to initialize. This must not be \c NULL. |
| */ |
| void mbedtls_ccm_init( mbedtls_ccm_context *ctx ); |
| |
| /** |
| * \brief This function initializes the CCM context set in the |
| * \p ctx parameter and sets the encryption key. |
| * |
| * \param ctx The CCM context to initialize. This must be an initialized |
| * context. |
| * \param cipher The 128-bit block cipher to use. |
| * \param key The encryption key. This must not be \c NULL. |
| * \param keybits The key size in bits. This must be acceptable by the cipher. |
| * |
| * \return \c 0 on success. |
| * \return A CCM or cipher-specific error code on failure. |
| */ |
| int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx, |
| mbedtls_cipher_id_t cipher, |
| const unsigned char *key, |
| unsigned int keybits ); |
| |
| /** |
| * \brief This function releases and clears the specified CCM context |
| * and underlying cipher sub-context. |
| * |
| * \param ctx The CCM context to clear. If this is \c NULL, the function |
| * has no effect. Otherwise, this must be initialized. |
| */ |
| void mbedtls_ccm_free( mbedtls_ccm_context *ctx ); |
| |
| /** |
| * \brief This function encrypts a buffer using CCM. |
| * |
| * \note The tag is written to a separate buffer. To concatenate |
| * the \p tag with the \p output, as done in <em>RFC-3610: |
| * Counter with CBC-MAC (CCM)</em>, use |
| * \p tag = \p output + \p length, and make sure that the |
| * output buffer is at least \p length + \p tag_len wide. |
| * |
| * \param ctx The CCM context to use for encryption. This must be |
| * initialized and bound to a key. |
| * \param length The length of the input data in Bytes. |
| * \param iv The initialization vector (nonce). This must be a readable |
| * buffer of at least \p iv_len Bytes. |
| * \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12, |
| * or 13. The length L of the message length field is |
| * 15 - \p iv_len. |
| * \param add The additional data field. If \p add_len is greater than |
| * zero, \p add must be a readable buffer of at least that |
| * length. |
| * \param add_len The length of additional data in Bytes. |
| * This must be less than `2^16 - 2^8`. |
| * \param input The buffer holding the input data. If \p length is greater |
| * than zero, \p input must be a readable buffer of at least |
| * that length. |
| * \param output The buffer holding the output data. If \p length is greater |
| * than zero, \p output must be a writable buffer of at least |
| * that length. |
| * \param tag The buffer holding the authentication field. This must be a |
| * writable buffer of at least \p tag_len Bytes. |
| * \param tag_len The length of the authentication field to generate in Bytes: |
| * 4, 6, 8, 10, 12, 14 or 16. |
| * |
| * \return \c 0 on success. |
| * \return A CCM or cipher-specific error code on failure. |
| */ |
| int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *add, size_t add_len, |
| const unsigned char *input, unsigned char *output, |
| unsigned char *tag, size_t tag_len ); |
| |
| /** |
| * \brief This function encrypts a buffer using CCM*. |
| * |
| * \note The tag is written to a separate buffer. To concatenate |
| * the \p tag with the \p output, as done in <em>RFC-3610: |
| * Counter with CBC-MAC (CCM)</em>, use |
| * \p tag = \p output + \p length, and make sure that the |
| * output buffer is at least \p length + \p tag_len wide. |
| * |
| * \note When using this function in a variable tag length context, |
| * the tag length has to be encoded into the \p iv passed to |
| * this function. |
| * |
| * \param ctx The CCM context to use for encryption. This must be |
| * initialized and bound to a key. |
| * \param length The length of the input data in Bytes. |
| * \param iv The initialization vector (nonce). This must be a readable |
| * buffer of at least \p iv_len Bytes. |
| * \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12, |
| * or 13. The length L of the message length field is |
| * 15 - \p iv_len. |
| * \param add The additional data field. This must be a readable buffer of |
| * at least \p add_len Bytes. |
| * \param add_len The length of additional data in Bytes. |
| * This must be less than 2^16 - 2^8. |
| * \param input The buffer holding the input data. If \p length is greater |
| * than zero, \p input must be a readable buffer of at least |
| * that length. |
| * \param output The buffer holding the output data. If \p length is greater |
| * than zero, \p output must be a writable buffer of at least |
| * that length. |
| * \param tag The buffer holding the authentication field. This must be a |
| * writable buffer of at least \p tag_len Bytes. |
| * \param tag_len The length of the authentication field to generate in Bytes: |
| * 0, 4, 6, 8, 10, 12, 14 or 16. |
| * |
| * \warning Passing \c 0 as \p tag_len means that the message is no |
| * longer authenticated. |
| * |
| * \return \c 0 on success. |
| * \return A CCM or cipher-specific error code on failure. |
| */ |
| int mbedtls_ccm_star_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *add, size_t add_len, |
| const unsigned char *input, unsigned char *output, |
| unsigned char *tag, size_t tag_len ); |
| |
| /** |
| * \brief This function performs a CCM authenticated decryption of a |
| * buffer. |
| * |
| * \param ctx The CCM context to use for decryption. This must be |
| * initialized and bound to a key. |
| * \param length The length of the input data in Bytes. |
| * \param iv The initialization vector (nonce). This must be a readable |
| * buffer of at least \p iv_len Bytes. |
| * \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12, |
| * or 13. The length L of the message length field is |
| * 15 - \p iv_len. |
| * \param add The additional data field. This must be a readable buffer |
| * of at least that \p add_len Bytes.. |
| * \param add_len The length of additional data in Bytes. |
| * This must be less than 2^16 - 2^8. |
| * \param input The buffer holding the input data. If \p length is greater |
| * than zero, \p input must be a readable buffer of at least |
| * that length. |
| * \param output The buffer holding the output data. If \p length is greater |
| * than zero, \p output must be a writable buffer of at least |
| * that length. |
| * \param tag The buffer holding the authentication field. This must be a |
| * readable buffer of at least \p tag_len Bytes. |
| * \param tag_len The length of the authentication field to generate in Bytes: |
| * 4, 6, 8, 10, 12, 14 or 16. |
| * |
| * \return \c 0 on success. This indicates that the message is authentic. |
| * \return #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match. |
| * \return A cipher-specific error code on calculation failure. |
| */ |
| int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *add, size_t add_len, |
| const unsigned char *input, unsigned char *output, |
| const unsigned char *tag, size_t tag_len ); |
| |
| /** |
| * \brief This function performs a CCM* authenticated decryption of a |
| * buffer. |
| * |
| * \note When using this function in a variable tag length context, |
| * the tag length has to be decoded from \p iv and passed to |
| * this function as \p tag_len. (\p tag needs to be adjusted |
| * accordingly.) |
| * |
| * \param ctx The CCM context to use for decryption. This must be |
| * initialized and bound to a key. |
| * \param length The length of the input data in Bytes. |
| * \param iv The initialization vector (nonce). This must be a readable |
| * buffer of at least \p iv_len Bytes. |
| * \param iv_len The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12, |
| * or 13. The length L of the message length field is |
| * 15 - \p iv_len. |
| * \param add The additional data field. This must be a readable buffer of |
| * at least that \p add_len Bytes. |
| * \param add_len The length of additional data in Bytes. |
| * This must be less than 2^16 - 2^8. |
| * \param input The buffer holding the input data. If \p length is greater |
| * than zero, \p input must be a readable buffer of at least |
| * that length. |
| * \param output The buffer holding the output data. If \p length is greater |
| * than zero, \p output must be a writable buffer of at least |
| * that length. |
| * \param tag The buffer holding the authentication field. This must be a |
| * readable buffer of at least \p tag_len Bytes. |
| * \param tag_len The length of the authentication field in Bytes. |
| * 0, 4, 6, 8, 10, 12, 14 or 16. |
| * |
| * \warning Passing \c 0 as \p tag_len means that the message is nos |
| * longer authenticated. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match. |
| * \return A cipher-specific error code on calculation failure. |
| */ |
| int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *add, size_t add_len, |
| const unsigned char *input, unsigned char *output, |
| const 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 */ |