esp-idf/components/mbedtls/port/aes/esp_aes_common.c

77 wiersze
1.8 KiB
C

/*
* AES block cipher, ESP hardware accelerated version, common
* Based on mbedTLS FIPS-197 compliant version.
*
* SPDX-FileCopyrightText: The Mbed TLS Contributors
*
* SPDX-License-Identifier: Apache-2.0
*
* SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
*/
/*
* The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
*
* http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
* http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
*/
#include "aes/esp_aes_internal.h"
#include "mbedtls/aes.h"
#include "hal/aes_hal.h"
#include "hal/aes_types.h"
#include "soc/soc_caps.h"
#include "mbedtls/error.h"
#include <string.h>
#include "mbedtls/platform.h"
#if SOC_AES_GDMA
#include "esp_aes_dma_priv.h"
#endif
bool valid_key_length(const esp_aes_context *ctx)
{
bool valid_len = (ctx->key_bytes == AES_128_KEY_BYTES) || (ctx->key_bytes == AES_256_KEY_BYTES);
#if SOC_AES_SUPPORT_AES_192
valid_len |= ctx->key_bytes == AES_192_KEY_BYTES;
#endif
return valid_len;
}
void esp_aes_init( esp_aes_context *ctx )
{
bzero( ctx, sizeof( esp_aes_context ) );
}
void esp_aes_free( esp_aes_context *ctx )
{
if ( ctx == NULL ) {
return;
}
bzero( ctx, sizeof( esp_aes_context ) );
}
/*
* AES key schedule (same for encryption or decryption, as hardware handles schedule)
*
*/
int esp_aes_setkey( esp_aes_context *ctx, const unsigned char *key,
unsigned int keybits )
{
#if !SOC_AES_SUPPORT_AES_192
if (keybits == 192) {
return MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED;
}
#endif
if (keybits != 128 && keybits != 192 && keybits != 256) {
return MBEDTLS_ERR_AES_INVALID_KEY_LENGTH;
}
ctx->key_bytes = keybits / 8;
memcpy(ctx->key, key, ctx->key_bytes);
ctx->key_in_hardware = 0;
return 0;
}