141 lines
4.8 KiB
C
141 lines
4.8 KiB
C
/**
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* \file ccm.h
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*
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* \brief Counter with CBC-MAC (CCM) for 128-bit block ciphers
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*
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* Copyright (C) 2006-2015, ARM Limited, 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 function. */
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#define MBEDTLS_ERR_CCM_AUTH_FAILED -0x000F /**< Authenticated decryption failed. */
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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 CCM context structure
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*/
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typedef struct {
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mbedtls_cipher_context_t cipher_ctx; /*!< cipher context used */
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}
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mbedtls_ccm_context;
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/**
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* \brief Initialize CCM context (just makes references valid)
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* Makes the context ready for mbedtls_ccm_setkey() or
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* mbedtls_ccm_free().
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*
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* \param ctx 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 CCM initialization (encryption and decryption)
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*
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* \param ctx CCM context to be initialized
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* \param cipher cipher to use (a 128-bit block cipher)
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* \param key encryption key
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* \param keybits key size in bits (must be acceptable by the cipher)
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*
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* \return 0 if successful, 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 Free a CCM context and underlying cipher sub-context
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*
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* \param ctx CCM context to free
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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 CCM buffer encryption
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*
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* \param ctx CCM context
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* \param length length of the input data in bytes
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* \param iv nonce (initialization vector)
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* \param iv_len length of IV in bytes
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* must be 2, 3, 4, 5, 6, 7 or 8
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* \param add additional data
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* \param add_len length of additional data in bytes
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* must be less than 2^16 - 2^8
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* \param input buffer holding the input data
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* \param output buffer for holding the output data
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* must be at least 'length' bytes wide
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* \param tag buffer for holding the tag
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* \param tag_len length of the tag to generate in bytes
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* must be 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 get the tag
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* concatenated with the output as in the CCM spec, use
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* tag = output + length and make sure the output buffer is
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* at least length + tag_len wide.
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*
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* \return 0 if successful
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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 CCM buffer authenticated decryption
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*
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* \param ctx CCM context
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* \param length length of the input data
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* \param iv initialization vector
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* \param iv_len length of IV
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* \param add additional data
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* \param add_len length of additional data
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* \param input buffer holding the input data
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* \param output buffer for holding the output data
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* \param tag buffer holding the tag
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* \param tag_len length of the tag
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*
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* \return 0 if successful and authenticated,
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* MBEDTLS_ERR_CCM_AUTH_FAILED if 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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#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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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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