mbed client lightswitch demo
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Diff: mbedtls/mbedtls/ccm.h
- Revision:
- 11:cada08fc8a70
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbedtls/mbedtls/ccm.h Thu Jun 09 17:08:36 2016 +0000 @@ -0,0 +1,141 @@ +/** + * \file ccm.h + * + * \brief Counter with CBC-MAC (CCM) for 128-bit block ciphers + * + * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved + * 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. + * + * This file is part of mbed TLS (https://tls.mbed.org) + */ +#ifndef MBEDTLS_CCM_H +#define MBEDTLS_CCM_H + +#include "cipher.h" + +#define MBEDTLS_ERR_CCM_BAD_INPUT -0x000D /**< Bad input parameters to function. */ +#define MBEDTLS_ERR_CCM_AUTH_FAILED -0x000F /**< Authenticated decryption failed. */ + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \brief CCM context structure + */ +typedef struct { + mbedtls_cipher_context_t cipher_ctx; /*!< cipher context used */ +} +mbedtls_ccm_context; + +/** + * \brief Initialize CCM context (just makes references valid) + * Makes the context ready for mbedtls_ccm_setkey() or + * mbedtls_ccm_free(). + * + * \param ctx CCM context to initialize + */ +void mbedtls_ccm_init( mbedtls_ccm_context *ctx ); + +/** + * \brief CCM initialization (encryption and decryption) + * + * \param ctx CCM context to be initialized + * \param cipher cipher to use (a 128-bit block cipher) + * \param key encryption key + * \param keybits key size in bits (must be acceptable by the cipher) + * + * \return 0 if successful, or a cipher specific error code + */ +int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx, + mbedtls_cipher_id_t cipher, + const unsigned char *key, + unsigned int keybits ); + +/** + * \brief Free a CCM context and underlying cipher sub-context + * + * \param ctx CCM context to free + */ +void mbedtls_ccm_free( mbedtls_ccm_context *ctx ); + +/** + * \brief CCM buffer encryption + * + * \param ctx CCM context + * \param length length of the input data in bytes + * \param iv nonce (initialization vector) + * \param iv_len length of IV in bytes + * must be 2, 3, 4, 5, 6, 7 or 8 + * \param add additional data + * \param add_len length of additional data in bytes + * must be less than 2^16 - 2^8 + * \param input buffer holding the input data + * \param output buffer for holding the output data + * must be at least 'length' bytes wide + * \param tag buffer for holding the tag + * \param tag_len length of the tag to generate in bytes + * must be 4, 6, 8, 10, 14 or 16 + * + * \note The tag is written to a separate buffer. To get the tag + * concatenated with the output as in the CCM spec, use + * tag = output + length and make sure the output buffer is + * at least length + tag_len wide. + * + * \return 0 if successful + */ +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 CCM buffer authenticated decryption + * + * \param ctx CCM context + * \param length length of the input data + * \param iv initialization vector + * \param iv_len length of IV + * \param add additional data + * \param add_len length of additional data + * \param input buffer holding the input data + * \param output buffer for holding the output data + * \param tag buffer holding the tag + * \param tag_len length of the tag + * + * \return 0 if successful and authenticated, + * MBEDTLS_ERR_CCM_AUTH_FAILED if tag does not match + */ +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 ); + +#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C) +/** + * \brief Checkup routine + * + * \return 0 if successful, or 1 if the test failed + */ +int mbedtls_ccm_self_test( int verbose ); +#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */ + +#ifdef __cplusplus +} +#endif + +#endif /* MBEDTLS_CCM_H */