include/mbedtls/ccm.h - third_party/github/ARMmbed/mbedtls - Git at Google

 /**
  * \file ccm.h
  *
  * \brief 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>
  *
  */
 /*
  *  Copyright (C) 2006-2018, Arm Limited (or its affiliates), 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 the function. */
 #define MBEDTLS_ERR_CCM_AUTH_FAILED     -0x000F /**< Authenticated decryption failed. */
 #define MBEDTLS_ERR_CCM_HW_ACCEL_FAILED -0x0011 /**< CCM hardware accelerator failed. */

 #if !defined(MBEDTLS_CCM_ALT)
 // Regular implementation
 //

 #ifdef __cplusplus
 extern "C" {
 #endif

 /**
  * \brief    The CCM context-type definition. The CCM context is passed
  *           to the APIs called.
  */
 typedef struct {
     mbedtls_cipher_context_t cipher_ctx;    /*!< The cipher context used. */
 }
 mbedtls_ccm_context;

 /**
  * \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.
  */
 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.
  * \param cipher    The 128-bit block cipher to use.
  * \param key       The encryption key.
  * \param keybits   The key size in bits. This must be acceptable by the cipher.
  *
  * \return          \c 0 on success, 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   This function releases and clears the specified CCM context
  *          and underlying cipher sub-context.
  *
  * \param ctx       The CCM context to clear.
  */
 void mbedtls_ccm_free( mbedtls_ccm_context *ctx );

 /**
  * \brief           This function encrypts a buffer using CCM.
  *
  * \param ctx       The CCM context to use for encryption.
  * \param length    The length of the input data in Bytes.
  * \param iv        Initialization vector (nonce).
  * \param iv_len    The length of the IV in Bytes: 7, 8, 9, 10, 11, 12, or 13.
  * \param add       The additional data field.
  * \param add_len   The length of additional data in Bytes.
  *                  Must be less than 2^16 - 2^8.
  * \param input     The buffer holding the input data.
  * \param output    The buffer holding the output data.
  *                  Must be at least \p length Bytes wide.
  * \param tag       The buffer holding the tag.
  * \param tag_len   The length of the tag to generate in Bytes:
  *                  4, 6, 8, 10, 12, 14 or 16.
  *
  * \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.
  *
  * \return          \c 0 on success.
  */
 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 performs a CCM authenticated decryption of a
  *                  buffer.
  *
  * \param ctx       The CCM context to use for decryption.
  * \param length    The length of the input data in Bytes.
  * \param iv        Initialization vector.
  * \param iv_len    The length of the IV in Bytes: 7, 8, 9, 10, 11, 12, or 13.
  * \param add       The additional data field.
  * \param add_len   The length of additional data in Bytes.
  *                  Must be less than 2^16 - 2^8.
  * \param input     The buffer holding the input data.
  * \param output    The buffer holding the output data.
  *                  Must be at least \p length Bytes wide.
  * \param tag       The buffer holding the tag.
  * \param tag_len   The length of the tag in Bytes.
  *                  4, 6, 8, 10, 12, 14 or 16.
  *
  * \return          0 if successful and authenticated, or
  *                  #MBEDTLS_ERR_CCM_AUTH_FAILED if the 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 );

 #ifdef __cplusplus
 }
 #endif

 #else  /* MBEDTLS_CCM_ALT */
 #include "ccm_alt.h"
 #endif /* MBEDTLS_CCM_ALT */

 #ifdef __cplusplus
 extern "C" {
 #endif

 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
 /**
  * \brief          The CCM checkup routine.
  *
  * \return         \c 0 on success, or \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 */
	/**
	* \file ccm.h
	*
	* \brief 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>
	*
	*/
	/*
	* Copyright (C) 2006-2018, Arm Limited (or its affiliates), 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 the function. /
	#define MBEDTLS_ERR_CCM_AUTH_FAILED -0x000F /*< Authenticated decryption failed. /
	#define MBEDTLS_ERR_CCM_HW_ACCEL_FAILED -0x0011 /*< CCM hardware accelerator failed. /

	#if !defined(MBEDTLS_CCM_ALT)
	// Regular implementation
	//

	#ifdef __cplusplus
	extern "C" {
	#endif

	/**
	* \brief The CCM context-type definition. The CCM context is passed
	* to the APIs called.
	*/
	typedef struct {
	mbedtls_cipher_context_t cipher_ctx; /!< The cipher context used. /
	}
	mbedtls_ccm_context;

	/**
	* \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.
	*/
	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.
	* \param cipher The 128-bit block cipher to use.
	* \param key The encryption key.
	* \param keybits The key size in bits. This must be acceptable by the cipher.
	*
	* \return \c 0 on success, 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 This function releases and clears the specified CCM context
	* and underlying cipher sub-context.
	*
	* \param ctx The CCM context to clear.
	*/
	void mbedtls_ccm_free( mbedtls_ccm_context *ctx );

	/**
	* \brief This function encrypts a buffer using CCM.
	*
	* \param ctx The CCM context to use for encryption.
	* \param length The length of the input data in Bytes.
	* \param iv Initialization vector (nonce).
	* \param iv_len The length of the IV in Bytes: 7, 8, 9, 10, 11, 12, or 13.
	* \param add The additional data field.
	* \param add_len The length of additional data in Bytes.
	* Must be less than 2^16 - 2^8.
	* \param input The buffer holding the input data.
	* \param output The buffer holding the output data.
	* Must be at least \p length Bytes wide.
	* \param tag The buffer holding the tag.
	* \param tag_len The length of the tag to generate in Bytes:
	* 4, 6, 8, 10, 12, 14 or 16.
	*
	* \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.
	*
	* \return \c 0 on success.
	*/
	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 performs a CCM authenticated decryption of a
	* buffer.
	*
	* \param ctx The CCM context to use for decryption.
	* \param length The length of the input data in Bytes.
	* \param iv Initialization vector.
	* \param iv_len The length of the IV in Bytes: 7, 8, 9, 10, 11, 12, or 13.
	* \param add The additional data field.
	* \param add_len The length of additional data in Bytes.
	* Must be less than 2^16 - 2^8.
	* \param input The buffer holding the input data.
	* \param output The buffer holding the output data.
	* Must be at least \p length Bytes wide.
	* \param tag The buffer holding the tag.
	* \param tag_len The length of the tag in Bytes.
	* 4, 6, 8, 10, 12, 14 or 16.
	*
	* \return 0 if successful and authenticated, or
	* #MBEDTLS_ERR_CCM_AUTH_FAILED if the 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 );

	#ifdef __cplusplus
	}
	#endif

	#else /* MBEDTLS_CCM_ALT */
	#include "ccm_alt.h"
	#endif /* MBEDTLS_CCM_ALT */

	#ifdef __cplusplus
	extern "C" {
	#endif

	#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
	/**
	* \brief The CCM checkup routine.
	*
	* \return \c 0 on success, or \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 */