mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
336 lines
12 KiB
C
336 lines
12 KiB
C
/**
|
|
* \brief AES block cipher, ESP32 hardware accelerated version
|
|
* Based on mbedTLS FIPS-197 compliant version.
|
|
*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* Additions Copyright (C) 2016, Espressif Systems (Shanghai) PTE Ltd
|
|
* 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.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifndef ESP_AES_H
|
|
#define ESP_AES_H
|
|
|
|
#include "esp_types.h"
|
|
#include "rom/aes.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* padlock.c and aesni.c rely on these values! */
|
|
#define ESP_AES_ENCRYPT 1
|
|
#define ESP_AES_DECRYPT 0
|
|
|
|
#define ERR_ESP_AES_INVALID_KEY_LENGTH -0x0020 /**< Invalid key length. */
|
|
#define ERR_ESP_AES_INVALID_INPUT_LENGTH -0x0022 /**< Invalid data input length. */
|
|
|
|
/**
|
|
* \brief AES context structure
|
|
*
|
|
* \note buf is able to hold 32 extra bytes, which can be used:
|
|
* - for alignment purposes if VIA padlock is used, and/or
|
|
* - to simplify key expansion in the 256-bit case by
|
|
* generating an extra round key
|
|
*/
|
|
typedef struct {
|
|
uint8_t key_bytes;
|
|
uint8_t key[32];
|
|
} esp_aes_context;
|
|
|
|
|
|
/**
|
|
* \brief The AES XTS context-type definition.
|
|
*/
|
|
typedef struct
|
|
{
|
|
esp_aes_context crypt; /*!< The AES context to use for AES block
|
|
encryption or decryption. */
|
|
esp_aes_context tweak; /*!< The AES context used for tweak
|
|
computation. */
|
|
} esp_aes_xts_context;
|
|
|
|
|
|
/**
|
|
* \brief Lock access to AES hardware unit
|
|
*
|
|
* AES hardware unit can only be used by one
|
|
* consumer at a time.
|
|
*
|
|
* esp_aes_xxx API calls automatically manage locking & unlocking of
|
|
* hardware, this function is only needed if you want to call
|
|
* ets_aes_xxx functions directly.
|
|
*/
|
|
void esp_aes_acquire_hardware( void );
|
|
|
|
/**
|
|
* \brief Unlock access to AES hardware unit
|
|
*
|
|
* esp_aes_xxx API calls automatically manage locking & unlocking of
|
|
* hardware, this function is only needed if you want to call
|
|
* ets_aes_xxx functions directly.
|
|
*/
|
|
void esp_aes_release_hardware( void );
|
|
|
|
/**
|
|
* \brief Initialize AES context
|
|
*
|
|
* \param ctx AES context to be initialized
|
|
*/
|
|
void esp_aes_init( esp_aes_context *ctx );
|
|
|
|
/**
|
|
* \brief Clear AES context
|
|
*
|
|
* \param ctx AES context to be cleared
|
|
*/
|
|
void esp_aes_free( esp_aes_context *ctx );
|
|
|
|
/**
|
|
* \brief This function initializes the specified AES XTS context.
|
|
*
|
|
* It must be the first API called before using
|
|
* the context.
|
|
*
|
|
* \param ctx The AES XTS context to initialize.
|
|
*/
|
|
void esp_aes_xts_init( esp_aes_xts_context *ctx );
|
|
|
|
/**
|
|
* \brief This function releases and clears the specified AES XTS context.
|
|
*
|
|
* \param ctx The AES XTS context to clear.
|
|
*/
|
|
void esp_aes_xts_free( esp_aes_xts_context *ctx );
|
|
|
|
/**
|
|
* \brief AES set key schedule (encryption or decryption)
|
|
*
|
|
* \param ctx AES context to be initialized
|
|
* \param key encryption key
|
|
* \param keybits must be 128, 192 or 256
|
|
*
|
|
* \return 0 if successful, or ERR_AES_INVALID_KEY_LENGTH
|
|
*/
|
|
int esp_aes_setkey( esp_aes_context *ctx, const unsigned char *key, unsigned int keybits );
|
|
|
|
/**
|
|
* \brief AES-ECB block encryption/decryption
|
|
*
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param input 16-byte input block
|
|
* \param output 16-byte output block
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int esp_aes_crypt_ecb( esp_aes_context *ctx, int mode, const unsigned char input[16], unsigned char output[16] );
|
|
|
|
/**
|
|
* \brief AES-CBC buffer encryption/decryption
|
|
* Length should be a multiple of the block
|
|
* size (16 bytes)
|
|
*
|
|
* \note Upon exit, the content of the IV is updated so that you can
|
|
* call the function same function again on the following
|
|
* block(s) of data and get the same result as if it was
|
|
* encrypted in one call. This allows a "streaming" usage.
|
|
* If on the other hand you need to retain the contents of the
|
|
* IV, you should either save it manually or use the cipher
|
|
* module instead.
|
|
*
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param length length of the input data
|
|
* \param iv initialization vector (updated after use)
|
|
* \param input buffer holding the input data
|
|
* \param output buffer holding the output data
|
|
*
|
|
* \return 0 if successful, or ERR_AES_INVALID_INPUT_LENGTH
|
|
*/
|
|
int esp_aes_crypt_cbc( esp_aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
|
|
/**
|
|
* \brief AES-CFB128 buffer encryption/decryption.
|
|
*
|
|
* Note: Due to the nature of CFB you should use the same key schedule for
|
|
* both encryption and decryption. So a context initialized with
|
|
* esp_aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
|
|
*
|
|
* \note Upon exit, the content of the IV is updated so that you can
|
|
* call the function same function again on the following
|
|
* block(s) of data and get the same result as if it was
|
|
* encrypted in one call. This allows a "streaming" usage.
|
|
* If on the other hand you need to retain the contents of the
|
|
* IV, you should either save it manually or use the cipher
|
|
* module instead.
|
|
*
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param length length of the input data
|
|
* \param iv_off offset in IV (updated after use)
|
|
* \param iv initialization vector (updated after use)
|
|
* \param input buffer holding the input data
|
|
* \param output buffer holding the output data
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int esp_aes_crypt_cfb128( esp_aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
size_t *iv_off,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief AES-CFB8 buffer encryption/decryption.
|
|
*
|
|
* Note: Due to the nature of CFB you should use the same key schedule for
|
|
* both encryption and decryption. So a context initialized with
|
|
* esp_aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
|
|
*
|
|
* \note Upon exit, the content of the IV is updated so that you can
|
|
* call the function same function again on the following
|
|
* block(s) of data and get the same result as if it was
|
|
* encrypted in one call. This allows a "streaming" usage.
|
|
* If on the other hand you need to retain the contents of the
|
|
* IV, you should either save it manually or use the cipher
|
|
* module instead.
|
|
*
|
|
* \param ctx AES context
|
|
* \param mode AES_ENCRYPT or AES_DECRYPT
|
|
* \param length length of the input data
|
|
* \param iv initialization vector (updated after use)
|
|
* \param input buffer holding the input data
|
|
* \param output buffer holding the output data
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int esp_aes_crypt_cfb8( esp_aes_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
unsigned char iv[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief AES-CTR buffer encryption/decryption
|
|
*
|
|
* Warning: You have to keep the maximum use of your counter in mind!
|
|
*
|
|
* Note: Due to the nature of CTR you should use the same key schedule for
|
|
* both encryption and decryption. So a context initialized with
|
|
* esp_aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
|
|
*
|
|
* \param ctx AES context
|
|
* \param length The length of the data
|
|
* \param nc_off The offset in the current stream_block (for resuming
|
|
* within current cipher stream). The offset pointer to
|
|
* should be 0 at the start of a stream.
|
|
* \param nonce_counter The 128-bit nonce and counter.
|
|
* \param stream_block The saved stream-block for resuming. Is overwritten
|
|
* by the function.
|
|
* \param input The input data stream
|
|
* \param output The output data stream
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int esp_aes_crypt_ctr( esp_aes_context *ctx,
|
|
size_t length,
|
|
size_t *nc_off,
|
|
unsigned char nonce_counter[16],
|
|
unsigned char stream_block[16],
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief This function prepares an XTS context for encryption and
|
|
* sets the encryption key.
|
|
*
|
|
* \param ctx The AES XTS context to which the key should be bound.
|
|
* \param key The encryption key. This is comprised of the XTS key1
|
|
* concatenated with the XTS key2.
|
|
* \param keybits The size of \p key passed in bits. Valid options are:
|
|
* <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li>
|
|
* <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul>
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.
|
|
*/
|
|
int esp_aes_xts_setkey_enc( esp_aes_xts_context *ctx,
|
|
const unsigned char *key,
|
|
unsigned int keybits );
|
|
|
|
/**
|
|
* \brief This function prepares an XTS context for decryption and
|
|
* sets the decryption key.
|
|
*
|
|
* \param ctx The AES XTS context to which the key should be bound.
|
|
* \param key The decryption key. This is comprised of the XTS key1
|
|
* concatenated with the XTS key2.
|
|
* \param keybits The size of \p key passed in bits. Valid options are:
|
|
* <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li>
|
|
* <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul>
|
|
*
|
|
* \return \c 0 on success.
|
|
* \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.
|
|
*/
|
|
int esp_aes_xts_setkey_dec( esp_aes_xts_context *ctx,
|
|
const unsigned char *key,
|
|
unsigned int keybits );
|
|
|
|
|
|
/**
|
|
* \brief Internal AES block encryption function
|
|
* (Only exposed to allow overriding it,
|
|
* see AES_ENCRYPT_ALT)
|
|
*
|
|
* \param ctx AES context
|
|
* \param input Plaintext block
|
|
* \param output Output (ciphertext) block
|
|
*/
|
|
int esp_internal_aes_encrypt( esp_aes_context *ctx, const unsigned char input[16], unsigned char output[16] );
|
|
|
|
/** Deprecated, see esp_aes_internal_encrypt */
|
|
void esp_aes_encrypt( esp_aes_context *ctx, const unsigned char input[16], unsigned char output[16] ) __attribute__((deprecated));
|
|
|
|
/**
|
|
* \brief Internal AES block decryption function
|
|
* (Only exposed to allow overriding it,
|
|
* see AES_DECRYPT_ALT)
|
|
*
|
|
* \param ctx AES context
|
|
* \param input Ciphertext block
|
|
* \param output Output (plaintext) block
|
|
*/
|
|
int esp_internal_aes_decrypt( esp_aes_context *ctx, const unsigned char input[16], unsigned char output[16] );
|
|
|
|
/** Deprecated, see esp_aes_internal_decrypt */
|
|
void esp_aes_decrypt( esp_aes_context *ctx, const unsigned char input[16], unsigned char output[16] ) __attribute__((deprecated));
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* aes.h */
|