mirror of https://github.com/ARMmbed/mbed-os.git
503 lines
20 KiB
C
503 lines
20 KiB
C
/**
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* \file aes_alt.h
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*
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* \brief This file contains AES definitions and functions.
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*
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* The Advanced Encryption Standard (AES) specifies a FIPS-approved
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* cryptographic algorithm that can be used to protect electronic
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* data.
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*
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* The AES algorithm is a symmetric block cipher that can
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* encrypt and decrypt information. For more information, see
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* <em>FIPS Publication 197: Advanced Encryption Standard</em> and
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* <em>ISO/IEC 18033-2:2006: Information technology -- Security
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* techniques -- Encryption algorithms -- Part 2: Asymmetric
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* ciphers</em>.
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*
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* The AES-XTS block mode is standardized by NIST SP 800-38E
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* <https://nvlpubs.nist.gov/nistpubs/legacy/sp/nistspecialpublication800-38e.pdf>
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* and described in detail by IEEE P1619
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* <https://ieeexplore.ieee.org/servlet/opac?punumber=4375278>.
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*/
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/* Copyright (C) 2006-2019, 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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* Copyright (C) 2006-2019 STMicroelectronics, All Rights Reserved
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*
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* This file implements ST AES HW services based on API from mbed TLS
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*/
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#ifndef MBEDTLS_AES_ALT_H
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#define MBEDTLS_AES_ALT_H
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#if defined(MBEDTLS_AES_ALT)
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#include "mbedtls/platform.h"
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#include "cmsis.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ST_AES_TIMEOUT ((uint32_t) 0xFF) /* 255 ms timeout for the crypto processor */
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#define ST_ERR_AES_BUSY (-0x0023) /* Crypto processor is busy, timeout occured */
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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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uint32_t aes_key[8]; /* Decryption key */
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CRYP_HandleTypeDef hcryp_aes;
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uint32_t ctx_save_cr; /* save context for multi-instance */
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}
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mbedtls_aes_context;
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief The AES XTS context-type definition.
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*/
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typedef struct mbedtls_aes_xts_context {
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mbedtls_aes_context crypt; /*!< The AES context to use for AES block
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encryption or decryption. */
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mbedtls_aes_context tweak; /*!< The AES context used for tweak
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computation. */
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} mbedtls_aes_xts_context;
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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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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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief This function initializes the specified AES XTS context.
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*
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* It must be the first API called before using
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* the context.
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*
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* \param ctx The AES XTS context to initialize. This must not be \c NULL.
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*/
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void mbedtls_aes_xts_init(mbedtls_aes_xts_context *ctx);
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/**
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* \brief This function releases and clears the specified AES XTS context.
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*
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* \param ctx The AES XTS context to clear.
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* If this is \c NULL, this function does nothing.
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* Otherwise, the context must have been at least initialized.
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*/
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void mbedtls_aes_xts_free(mbedtls_aes_xts_context *ctx);
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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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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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief This function prepares an XTS context for encryption and
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* sets the encryption key.
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*
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* \param ctx The AES XTS context to which the key should be bound.
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* It must be initialized.
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* \param key The encryption key. This is comprised of the XTS key1
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* concatenated with the XTS key2.
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* This must be a readable buffer of size \p keybits bits.
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* \param keybits The size of \p key passed in bits. Valid options are:
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* <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li>
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* <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul>
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.
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*/
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int mbedtls_aes_xts_setkey_enc(mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits);
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/**
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* \brief This function prepares an XTS context for decryption and
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* sets the decryption key.
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*
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* \param ctx The AES XTS context to which the key should be bound.
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* It must be initialized.
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* \param key The decryption key. This is comprised of the XTS key1
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* concatenated with the XTS key2.
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* This must be a readable buffer of size \p keybits bits.
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* \param keybits The size of \p key passed in bits. Valid options are:
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* <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li>
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* <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul>
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.
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*/
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int mbedtls_aes_xts_setkey_dec(mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits);
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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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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#if defined(MBEDTLS_CIPHER_MODE_CBC)
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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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#endif /* MBEDTLS_CIPHER_MODE_CBC */
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief This function performs an AES-XTS encryption or decryption
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* operation for an entire XTS data unit.
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*
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* AES-XTS encrypts or decrypts blocks based on their location as
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* defined by a data unit number. The data unit number must be
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* provided by \p data_unit.
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*
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* NIST SP 800-38E limits the maximum size of a data unit to 2^20
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* AES blocks. If the data unit is larger than this, this function
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* returns #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH.
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*
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* \param ctx The AES XTS context to use for AES XTS operations.
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* It must be initialized and bound to a key.
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* \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or
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* #MBEDTLS_AES_DECRYPT.
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* \param length The length of a data unit in Bytes. This can be any
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* length between 16 bytes and 2^24 bytes inclusive
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* (between 1 and 2^20 block cipher blocks).
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* \param data_unit The address of the data unit encoded as an array of 16
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* bytes in little-endian format. For disk encryption, this
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* is typically the index of the block device sector that
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* contains the data.
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* \param input The buffer holding the input data (which is an entire
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* data unit). This function reads \p length Bytes from \p
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* input.
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* \param output The buffer holding the output data (which is an entire
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* data unit). This function writes \p length Bytes to \p
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* output.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH if \p length is
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* smaller than an AES block in size (16 Bytes) or if \p
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* length is larger than 2^20 blocks (16 MiB).
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*/
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int mbedtls_aes_crypt_xts(mbedtls_aes_xts_context *ctx,
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int mode,
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size_t length,
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const unsigned char data_unit[16],
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const unsigned char *input,
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unsigned char *output);
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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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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#if defined(MBEDTLS_CIPHER_MODE_OFB)
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/**
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* \brief This function performs an AES-OFB (Output Feedback Mode)
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* encryption or decryption operation.
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*
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* For OFB, you must set up the context with
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* mbedtls_aes_setkey_enc(), regardless of whether you are
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* performing an encryption or decryption operation. This is
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* because OFB mode uses the same key schedule for encryption and
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* decryption.
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*
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* The OFB operation is identical for encryption or decryption,
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* therefore no operation mode needs to be specified.
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*
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* \note Upon exit, the content of iv, the Initialisation Vector, is
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* updated so that you can call the same function again on the next
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* block(s) of data and get the same result as if it was encrypted
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* in one call. This allows a "streaming" usage, by initialising
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* iv_off to 0 before the first call, and preserving its value
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* between calls.
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*
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* For non-streaming use, the iv should be initialised on each call
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* to a unique value, and iv_off set to 0 on each call.
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*
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* If you need to retain the contents of the initialisation vector,
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* you must either save it manually or use the cipher module
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* instead.
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*
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* \warning For the OFB mode, the initialisation vector must be unique
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* every encryption operation. Reuse of an initialisation vector
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* will compromise security.
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*
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* \param ctx The AES context to use for encryption or decryption.
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* It must be initialized and bound to a key.
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* \param length The length of the input data.
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* \param iv_off The offset in IV (updated after use).
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* It must point to a valid \c size_t.
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* \param iv The initialization vector (updated after use).
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* It must be a readable and writeable buffer of \c 16 Bytes.
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* \param input The buffer holding the input data.
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* It must be readable and of size \p length Bytes.
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* \param output The buffer holding the output data.
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* It must be writeable and of size \p length Bytes.
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*
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* \return \c 0 on success.
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*/
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int mbedtls_aes_crypt_ofb(mbedtls_aes_context *ctx,
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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_OFB */
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#if defined(MBEDTLS_CIPHER_MODE_CTR)
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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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#endif /* MBEDTLS_CIPHER_MODE_CTR */
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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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* \return 0 if successful
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*/
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int mbedtls_internal_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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* \return 0 if successful
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*/
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int mbedtls_internal_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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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#if defined(MBEDTLS_DEPRECATED_WARNING)
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#define MBEDTLS_DEPRECATED __attribute__((deprecated))
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#else
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#define MBEDTLS_DEPRECATED
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#endif
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/**
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* \brief Deprecated internal AES block encryption function
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* without return value.
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*
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* \deprecated Superseded by mbedtls_aes_encrypt_ext() in 2.5.0
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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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MBEDTLS_DEPRECATED 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 Deprecated internal AES block decryption function
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* without return value.
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*
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* \deprecated Superseded by mbedtls_aes_decrypt_ext() in 2.5.0
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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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MBEDTLS_DEPRECATED 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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#undef MBEDTLS_DEPRECATED
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#endif /* !MBEDTLS_DEPRECATED_REMOVED */
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#ifdef __cplusplus
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}
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|
#endif
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|
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#endif /* MBEDTLS_AES_ALT */
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|
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#endif /* MBEDTLS_AES_ALT_H */
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|