288 lines
9.9 KiB
C
288 lines
9.9 KiB
C
/**
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* \file aes.h
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*
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* \brief AES block cipher
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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_AES_H
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#define MBEDTLS_AES_H
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#include <stddef.h>
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#include <stdint.h>
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/* padlock.c and aesni.c rely on these values! */
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#define MBEDTLS_AES_ENCRYPT 1
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#define MBEDTLS_AES_DECRYPT 0
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#define MBEDTLS_ERR_AES_INVALID_KEY_LENGTH -0x0020 /**< Invalid key length. */
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#define MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH -0x0022 /**< Invalid data input length. */
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#if !defined(MBEDTLS_AES_ALT)
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// Regular implementation
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//
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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 AES context structure
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*
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* \note buf is able to hold 32 extra bytes, which can be used:
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* - for alignment purposes if VIA padlock is used, and/or
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* - to simplify key expansion in the 256-bit case by
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* generating an extra round key
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*/
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typedef struct
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{
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int nr; /*!< number of rounds */
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uint32_t *rk; /*!< AES round keys */
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uint32_t buf[68]; /*!< unaligned data */
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}
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mbedtls_aes_context;
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/**
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* \brief Initialize AES context
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*
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* \param ctx AES context to be initialized
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*/
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void mbedtls_aes_init( mbedtls_aes_context *ctx );
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/**
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* \brief Clear AES context
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*
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* \param ctx AES context to be cleared
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*/
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void mbedtls_aes_free( mbedtls_aes_context *ctx );
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/**
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* \brief AES key schedule (encryption)
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*
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* \param ctx AES 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_AES_INVALID_KEY_LENGTH
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*/
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int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief AES key schedule (decryption)
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*
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* \param ctx AES 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_AES_INVALID_KEY_LENGTH
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*/
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int mbedtls_aes_setkey_dec( mbedtls_aes_context *ctx, const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief AES-ECB block encryption/decryption
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*
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* \param ctx AES context
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* \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_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_aes_crypt_ecb( mbedtls_aes_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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/**
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* \brief AES-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 AES context
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* \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_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 MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH
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*/
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int mbedtls_aes_crypt_cbc( mbedtls_aes_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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#if defined(MBEDTLS_CIPHER_MODE_CFB)
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/**
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* \brief AES-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_aes_setkey_enc() for both MBEDTLS_AES_ENCRYPT and MBEDTLS_AES_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 AES context
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* \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_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
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*/
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int mbedtls_aes_crypt_cfb128( mbedtls_aes_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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/**
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* \brief AES-CFB8 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_aes_setkey_enc() for both MBEDTLS_AES_ENCRYPT and MBEDTLS_AES_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 AES context
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* \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_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
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*/
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int mbedtls_aes_crypt_cfb8( mbedtls_aes_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_CFB */
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/**
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* \brief AES-CTR buffer encryption/decryption
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*
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* Warning: You have to keep the maximum use of your counter in mind!
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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_aes_setkey_enc() for both MBEDTLS_AES_ENCRYPT and MBEDTLS_AES_DECRYPT.
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*
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* \param ctx AES 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_aes_crypt_ctr( mbedtls_aes_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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/**
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* \brief Internal AES block encryption function
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* (Only exposed to allow overriding it,
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* see MBEDTLS_AES_ENCRYPT_ALT)
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*
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* \param ctx AES context
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* \param input Plaintext block
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* \param output Output (ciphertext) block
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*/
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void mbedtls_aes_encrypt( mbedtls_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] );
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/**
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* \brief Internal AES block decryption function
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* (Only exposed to allow overriding it,
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* see MBEDTLS_AES_DECRYPT_ALT)
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*
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* \param ctx AES context
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* \param input Ciphertext block
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* \param output Output (plaintext) block
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*/
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void mbedtls_aes_decrypt( mbedtls_aes_context *ctx,
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const unsigned char input[16],
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unsigned char output[16] );
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#ifdef __cplusplus
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}
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#endif
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#else /* MBEDTLS_AES_ALT */
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#include "aes_alt.h"
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#endif /* MBEDTLS_AES_ALT */
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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 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_aes_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif /* aes.h */
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