mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
fe71a8e340
Removed the old dynamically allocated GDMA channel approach. It proved too unreliable as we couldn't not ensure consumers of the mbedtls would properly free the channels after use. Replaced by a single shared GDMA channel for AES and SHA, which won't be released unless user specifically calls API for releasing it.
269 lines
6.8 KiB
C
269 lines
6.8 KiB
C
/*
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* SHA-256 implementation with hardware ESP support added.
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* Additions Copyright (C) 2016-2020, Espressif Systems (Shanghai) PTE LTD
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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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*/
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/*
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* The SHA-256 Secure Hash Standard was published by NIST in 2002.
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*
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* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_SHA256_C) && defined(MBEDTLS_SHA256_ALT)
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#include "mbedtls/sha256.h"
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#include <string.h>
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#if defined(MBEDTLS_SELF_TEST)
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define mbedtls_printf printf
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#endif /* MBEDTLS_PLATFORM_C */
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#endif /* MBEDTLS_SELF_TEST */
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#include "sha/sha_dma.h"
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n )
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{
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volatile unsigned char *p = v;
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while ( n-- ) {
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*p++ = 0;
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}
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}
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_UINT32_BE
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#define GET_UINT32_BE(n,b,i) \
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do { \
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(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
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| ( (uint32_t) (b)[(i) + 1] << 16 ) \
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| ( (uint32_t) (b)[(i) + 2] << 8 ) \
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| ( (uint32_t) (b)[(i) + 3] ); \
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} while( 0 )
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#endif
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#ifndef PUT_UINT32_BE
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#define PUT_UINT32_BE(n,b,i) \
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do { \
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(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) ); \
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} while( 0 )
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#endif
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void mbedtls_sha256_init( mbedtls_sha256_context *ctx )
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{
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memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
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}
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void mbedtls_sha256_free( mbedtls_sha256_context *ctx )
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{
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if ( ctx == NULL ) {
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return;
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}
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mbedtls_zeroize( ctx, sizeof( mbedtls_sha256_context ) );
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}
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void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
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const mbedtls_sha256_context *src )
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{
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*dst = *src;
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}
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/*
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* SHA-256 context setup
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*/
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int mbedtls_sha256_starts_ret( mbedtls_sha256_context *ctx, int is224 )
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{
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memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
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if ( is224 ) {
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ctx->mode = SHA2_224;
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} else {
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ctx->mode = SHA2_256;
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}
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return 0;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_starts( mbedtls_sha256_context *ctx,
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int is224 )
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{
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mbedtls_sha256_starts_ret( ctx, is224 );
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}
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#endif
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int mbedtls_internal_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] )
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{
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int ret;
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esp_sha_acquire_hardware();
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ret = esp_sha_dma(ctx->mode, data, 64, 0, 0, ctx->first_block);
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esp_sha_release_hardware();
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return ret;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_process( mbedtls_sha256_context *ctx,
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const unsigned char data[64] )
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{
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mbedtls_internal_sha256_process( ctx, data );
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}
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#endif
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/*
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* SHA-256 process buffer
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*/
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int mbedtls_sha256_update_ret( mbedtls_sha256_context *ctx, const unsigned char *input,
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size_t ilen )
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{
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int ret = 0;
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size_t fill;
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uint32_t left, len, local_len = 0;
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if ( ilen == 0 ) {
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return 0;
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}
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if ( ctx->total[0] < (uint32_t) ilen ) {
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ctx->total[1]++;
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}
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/* Check if any data pending from previous call to this API */
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if ( left && ilen >= fill ) {
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memcpy( (void *) (ctx->buffer + left), input, fill );
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input += fill;
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ilen -= fill;
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left = 0;
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local_len = 64;
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}
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len = (ilen / 64) * 64;
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if ( len || local_len) {
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esp_sha_acquire_hardware();
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if (ctx->sha_state == ESP_SHA256_STATE_INIT) {
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ctx->first_block = true;
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ctx->sha_state = ESP_SHA256_STATE_IN_PROCESS;
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} else if (ctx->sha_state == ESP_SHA256_STATE_IN_PROCESS) {
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ctx->first_block = false;
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esp_sha_write_digest_state(ctx->mode, ctx->state);
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}
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ret = esp_sha_dma(ctx->mode, input, len, ctx->buffer, local_len, ctx->first_block);
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esp_sha_read_digest_state(ctx->mode, ctx->state);
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esp_sha_release_hardware();
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if (ret != 0) {
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return ret;
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}
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}
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if ( ilen > 0 ) {
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memcpy( (void *) (ctx->buffer + left), input + len, ilen - len );
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}
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return 0;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_update( mbedtls_sha256_context *ctx,
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const unsigned char *input,
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size_t ilen )
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{
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mbedtls_sha256_update_ret( ctx, input, ilen );
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}
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#endif
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static const unsigned char sha256_padding[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* SHA-256 final digest
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*/
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int mbedtls_sha256_finish_ret( mbedtls_sha256_context *ctx, unsigned char output[32] )
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{
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int ret;
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uint32_t last, padn;
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uint32_t high, low;
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unsigned char msglen[8];
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high = ( ctx->total[0] >> 29 )
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| ( ctx->total[1] << 3 );
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low = ( ctx->total[0] << 3 );
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PUT_UINT32_BE( high, msglen, 0 );
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PUT_UINT32_BE( low, msglen, 4 );
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last = ctx->total[0] & 0x3F;
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padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
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if ( ( ret = mbedtls_sha256_update_ret( ctx, sha256_padding, padn ) ) != 0 ) {
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return ret;
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}
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if ( ( ret = mbedtls_sha256_update_ret( ctx, msglen, 8 ) ) != 0 ) {
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return ret;
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}
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memcpy(output, ctx->state, 32);
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return ret;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_finish( mbedtls_sha256_context *ctx,
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unsigned char output[32] )
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{
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mbedtls_sha256_finish_ret( ctx, output );
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}
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#endif
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#endif /* MBEDTLS_SHA256_C && MBEDTLS_SHA256_ALT */
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