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428cc52a73
Thanks to forward declare we can declare `struct` in our header file instead making #include
272 lines
10 KiB
C
272 lines
10 KiB
C
/**
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* \file camellia.h
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*
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* \brief Camellia block cipher
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*/
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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_CAMELLIA_H
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#define MBEDTLS_CAMELLIA_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#define MBEDTLS_CAMELLIA_ENCRYPT 1
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#define MBEDTLS_CAMELLIA_DECRYPT 0
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#define MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH -0x0024 /**< Invalid key length. */
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#define MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH -0x0026 /**< Invalid data input length. */
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#define MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED -0x0027 /**< Camellia hardware accelerator failed. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_CAMELLIA_ALT)
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// Regular implementation
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//
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/**
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* \brief CAMELLIA context structure
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*/
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typedef struct mbedtls_camellia_context
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{
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int nr; /*!< number of rounds */
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uint32_t rk[68]; /*!< CAMELLIA round keys */
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}
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mbedtls_camellia_context;
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#else /* MBEDTLS_CAMELLIA_ALT */
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#include "camellia_alt.h"
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#endif /* MBEDTLS_CAMELLIA_ALT */
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/**
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* \brief Initialize CAMELLIA context
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*
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* \param ctx CAMELLIA context to be initialized
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*/
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void mbedtls_camellia_init( mbedtls_camellia_context *ctx );
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/**
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* \brief Clear CAMELLIA context
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*
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* \param ctx CAMELLIA context to be cleared
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*/
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void mbedtls_camellia_free( mbedtls_camellia_context *ctx );
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/**
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* \brief CAMELLIA key schedule (encryption)
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*
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* \param ctx CAMELLIA context to be initialized
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* \param key encryption key
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* \param keybits must be 128, 192 or 256
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*
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* \return 0 if successful, or MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
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*/
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int mbedtls_camellia_setkey_enc( mbedtls_camellia_context *ctx, const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief CAMELLIA key schedule (decryption)
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*
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* \param ctx CAMELLIA context to be initialized
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* \param key decryption key
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* \param keybits must be 128, 192 or 256
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*
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* \return 0 if successful, or MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
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*/
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int mbedtls_camellia_setkey_dec( mbedtls_camellia_context *ctx, const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief CAMELLIA-ECB block encryption/decryption
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*
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* \param ctx CAMELLIA context
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* \param mode MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
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* \param input 16-byte input block
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* \param output 16-byte output block
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*
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* \return 0 if successful
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*/
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int mbedtls_camellia_crypt_ecb( mbedtls_camellia_context *ctx,
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int mode,
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const unsigned char input[16],
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unsigned char output[16] );
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#if defined(MBEDTLS_CIPHER_MODE_CBC)
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/**
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* \brief CAMELLIA-CBC buffer encryption/decryption
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* Length should be a multiple of the block
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* size (16 bytes)
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*
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* \note Upon exit, the content of the IV is updated so that you can
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* call the function same function again on the following
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* block(s) of data and get the same result as if it was
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* encrypted in one call. This allows a "streaming" usage.
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* If on the other hand you need to retain the contents of the
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* IV, you should either save it manually or use the cipher
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* module instead.
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*
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* \param ctx CAMELLIA context
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* \param mode MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
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* \param length length of the input data
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* \param iv initialization vector (updated after use)
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* \param input buffer holding the input data
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* \param output buffer holding the output data
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*
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* \return 0 if successful, or
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* MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
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*/
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int mbedtls_camellia_crypt_cbc( mbedtls_camellia_context *ctx,
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int mode,
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size_t length,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CBC */
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#if defined(MBEDTLS_CIPHER_MODE_CFB)
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/**
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* \brief CAMELLIA-CFB128 buffer encryption/decryption
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*
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* Note: Due to the nature of CFB you should use the same key schedule for
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* both encryption and decryption. So a context initialized with
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* mbedtls_camellia_setkey_enc() for both MBEDTLS_CAMELLIA_ENCRYPT and CAMELLIE_DECRYPT.
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*
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* \note Upon exit, the content of the IV is updated so that you can
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* call the function same function again on the following
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* block(s) of data and get the same result as if it was
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* encrypted in one call. This allows a "streaming" usage.
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* If on the other hand you need to retain the contents of the
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* IV, you should either save it manually or use the cipher
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* module instead.
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*
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* \param ctx CAMELLIA context
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* \param mode MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
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* \param length length of the input data
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* \param iv_off offset in IV (updated after use)
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* \param iv initialization vector (updated after use)
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* \param input buffer holding the input data
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* \param output buffer holding the output data
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*
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* \return 0 if successful, or
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* MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
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*/
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int mbedtls_camellia_crypt_cfb128( mbedtls_camellia_context *ctx,
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int mode,
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size_t length,
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size_t *iv_off,
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unsigned char iv[16],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CFB */
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#if defined(MBEDTLS_CIPHER_MODE_CTR)
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/**
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* \brief CAMELLIA-CTR buffer encryption/decryption
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*
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* Note: Due to the nature of CTR you should use the same key schedule for
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* both encryption and decryption. So a context initialized with
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* mbedtls_camellia_setkey_enc() for both MBEDTLS_CAMELLIA_ENCRYPT and MBEDTLS_CAMELLIA_DECRYPT.
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*
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* \warning You must never reuse a nonce value with the same key. Doing so
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* would void the encryption for the two messages encrypted with
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* the same nonce and key.
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*
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* There are two common strategies for managing nonces with CTR:
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*
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* 1. You can handle everything as a single message processed over
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* successive calls to this function. In that case, you want to
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* set \p nonce_counter and \p nc_off to 0 for the first call, and
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* then preserve the values of \p nonce_counter, \p nc_off and \p
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* stream_block across calls to this function as they will be
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* updated by this function.
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*
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* With this strategy, you must not encrypt more than 2**128
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* blocks of data with the same key.
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*
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* 2. You can encrypt separate messages by dividing the \p
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* nonce_counter buffer in two areas: the first one used for a
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* per-message nonce, handled by yourself, and the second one
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* updated by this function internally.
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*
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* For example, you might reserve the first 12 bytes for the
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* per-message nonce, and the last 4 bytes for internal use. In that
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* case, before calling this function on a new message you need to
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* set the first 12 bytes of \p nonce_counter to your chosen nonce
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* value, the last 4 to 0, and \p nc_off to 0 (which will cause \p
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* stream_block to be ignored). That way, you can encrypt at most
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* 2**96 messages of up to 2**32 blocks each with the same key.
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*
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* The per-message nonce (or information sufficient to reconstruct
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* it) needs to be communicated with the ciphertext and must be unique.
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* The recommended way to ensure uniqueness is to use a message
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* counter. An alternative is to generate random nonces, but this
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* limits the number of messages that can be securely encrypted:
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* for example, with 96-bit random nonces, you should not encrypt
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* more than 2**32 messages with the same key.
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*
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* Note that for both stategies, sizes are measured in blocks and
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* that a CAMELLIA block is 16 bytes.
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*
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* \warning Upon return, \p stream_block contains sensitive data. Its
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* content must not be written to insecure storage and should be
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* securely discarded as soon as it's no longer needed.
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*
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* \param ctx CAMELLIA context
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* \param length The length of the data
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* \param nc_off The offset in the current stream_block (for resuming
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* within current cipher stream). The offset pointer to
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* should be 0 at the start of a stream.
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* \param nonce_counter The 128-bit nonce and counter.
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* \param stream_block The saved stream-block for resuming. Is overwritten
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* by the function.
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* \param input The input data stream
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* \param output The output data stream
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*
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* \return 0 if successful
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*/
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int mbedtls_camellia_crypt_ctr( mbedtls_camellia_context *ctx,
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size_t length,
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size_t *nc_off,
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unsigned char nonce_counter[16],
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unsigned char stream_block[16],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CTR */
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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_camellia_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif /* camellia.h */
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