esp-idf/components/mbedtls/port/sha/dma/esp_sha256.c

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/*
* SHA-256 implementation with hardware ESP support added.
*
* SPDX-FileCopyrightText: The Mbed TLS Contributors
*
* SPDX-License-Identifier: Apache-2.0
*
* SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
*/
/*
* The SHA-256 Secure Hash Standard was published by NIST in 2002.
*
* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
*/
#include <mbedtls/build_info.h>
#if defined(MBEDTLS_SHA256_C) && defined(MBEDTLS_SHA256_ALT)
#include "mbedtls/sha256.h"
#include <string.h>
#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf printf
#endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST */
#include "sha/sha_dma.h"
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n )
{
volatile unsigned char *p = v;
while ( n-- ) {
*p++ = 0;
}
}
/*
* 32-bit integer manipulation macros (big endian)
*/
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i) \
do { \
(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
| ( (uint32_t) (b)[(i) + 1] << 16 ) \
| ( (uint32_t) (b)[(i) + 2] << 8 ) \
| ( (uint32_t) (b)[(i) + 3] ); \
} while( 0 )
#endif
#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i) \
do { \
(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
(b)[(i) + 3] = (unsigned char) ( (n) ); \
} while( 0 )
#endif
void mbedtls_sha256_init( mbedtls_sha256_context *ctx )
{
memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
}
void mbedtls_sha256_free( mbedtls_sha256_context *ctx )
{
if ( ctx == NULL ) {
return;
}
mbedtls_zeroize( ctx, sizeof( mbedtls_sha256_context ) );
}
void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
const mbedtls_sha256_context *src )
{
*dst = *src;
}
/*
* SHA-256 context setup
*/
int mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 )
{
memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
if ( is224 ) {
ctx->mode = SHA2_224;
} else {
ctx->mode = SHA2_256;
}
return 0;
}
int mbedtls_internal_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] )
{
int ret;
esp_sha_acquire_hardware();
ret = esp_sha_dma(ctx->mode, data, 64, 0, 0, ctx->first_block);
esp_sha_release_hardware();
return ret;
}
/*
* SHA-256 process buffer
*/
int mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input,
size_t ilen )
{
int ret = 0;
size_t fill;
uint32_t left, len, local_len = 0;
if ( ilen == 0 ) {
return 0;
}
left = ctx->total[0] & 0x3F;
fill = 64 - left;
ctx->total[0] += (uint32_t) ilen;
ctx->total[0] &= 0xFFFFFFFF;
if ( ctx->total[0] < (uint32_t) ilen ) {
ctx->total[1]++;
}
/* Check if any data pending from previous call to this API */
if ( left && ilen >= fill ) {
memcpy( (void *) (ctx->buffer + left), input, fill );
input += fill;
ilen -= fill;
left = 0;
local_len = 64;
}
len = (ilen / 64) * 64;
if ( len || local_len) {
esp_sha_acquire_hardware();
if (ctx->sha_state == ESP_SHA256_STATE_INIT) {
ctx->first_block = true;
ctx->sha_state = ESP_SHA256_STATE_IN_PROCESS;
} else if (ctx->sha_state == ESP_SHA256_STATE_IN_PROCESS) {
ctx->first_block = false;
esp_sha_write_digest_state(ctx->mode, ctx->state);
}
ret = esp_sha_dma(ctx->mode, input, len, ctx->buffer, local_len, ctx->first_block);
esp_sha_read_digest_state(ctx->mode, ctx->state);
esp_sha_release_hardware();
if (ret != 0) {
return ret;
}
}
if ( ilen > 0 ) {
memcpy( (void *) (ctx->buffer + left), input + len, ilen - len );
}
return 0;
}
static const unsigned char sha256_padding[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/*
* SHA-256 final digest
*/
int mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char *output )
{
int ret;
uint32_t last, padn;
uint32_t high, low;
unsigned char msglen[8];
high = ( ctx->total[0] >> 29 )
| ( ctx->total[1] << 3 );
low = ( ctx->total[0] << 3 );
PUT_UINT32_BE( high, msglen, 0 );
PUT_UINT32_BE( low, msglen, 4 );
last = ctx->total[0] & 0x3F;
padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
if ( ( ret = mbedtls_sha256_update( ctx, sha256_padding, padn ) ) != 0 ) {
return ret;
}
if ( ( ret = mbedtls_sha256_update( ctx, msglen, 8 ) ) != 0 ) {
return ret;
}
memcpy(output, ctx->state, 32);
return ret;
}
#endif /* MBEDTLS_SHA256_C && MBEDTLS_SHA256_ALT */