/*
* SHA-1 implementation with hardware ESP32 support added.
* Uses mbedTLS software implementation for failover when concurrent
* SHA operations are in use.
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* Additions Copyright (C) 2016-2020, 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.
*
*/
/*
* The SHA-1 standard was published by NIST in 1993.
*
* http://www.itl.nist.gov/fipspubs/fip180-1.htm
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_SHA1_ALT)
#include "mbedtls/sha1.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 "esp32s2/sha.h"
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n )
{
volatile unsigned char *p = (unsigned char *)v; while ( n-- ) *p++ = 0;
}
/*
* 32-bit integer manipulation macros (big endian)
*/
#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i) \
{ \
(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) ); \
}
#endif
void mbedtls_sha1_init( mbedtls_sha1_context *ctx )
{
memset( ctx, 0, sizeof( mbedtls_sha1_context ) );
}
void mbedtls_sha1_free( mbedtls_sha1_context *ctx )
{
if ( ctx == NULL ) {
return;
}
mbedtls_zeroize( ctx, sizeof( mbedtls_sha1_context ) );
}
void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
const mbedtls_sha1_context *src )
{
memcpy(dst, src, sizeof(mbedtls_sha1_context));
}
/*
* SHA-1 context setup
*/
int mbedtls_sha1_starts_ret( mbedtls_sha1_context *ctx )
{
ctx->total[0] = 0;
ctx->total[1] = 0;
memset( ctx, 0, sizeof( mbedtls_sha1_context ) );
ctx->mode = SHA1;
return 0;
}
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_starts( mbedtls_sha1_context *ctx )
{
mbedtls_sha1_starts_ret( ctx );
}
#endif
static int esp_internal_sha1_dma_process(mbedtls_sha1_context *ctx,
const uint8_t *data, size_t len,
uint8_t *buf, size_t buf_len)
{
return esp_sha_dma(SHA1, data, len, buf, buf_len, ctx->first_block);
}
int mbedtls_internal_sha1_process( mbedtls_sha1_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;
}
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_process( mbedtls_sha1_context *ctx,
const unsigned char data[64] )
{
mbedtls_internal_sha1_process( ctx, data );
}
#endif
int mbedtls_sha1_update_ret( mbedtls_sha1_context *ctx, const unsigned char *input, size_t ilen )
{
int ret;
size_t fill;
uint32_t left, len, local_len = 0;
if ( !ilen || (input == NULL)) {
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]++;
}
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_SHA1_STATE_INIT) {
ctx->first_block = true;
ctx->sha_state = ESP_SHA1_STATE_IN_PROCESS;
} else if (ctx->sha_state == ESP_SHA1_STATE_IN_PROCESS) {
ctx->first_block = false;
esp_sha_write_digest_state(SHA1, ctx->state);
}
ret = esp_internal_sha1_dma_process(ctx, input, len, ctx->buffer, local_len);
esp_sha_read_digest_state(SHA1, 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;
}
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_update( mbedtls_sha1_context *ctx,
const unsigned char *input,
size_t ilen )
{
mbedtls_sha1_update_ret( ctx, input, ilen );
}
#endif
static const unsigned char sha1_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-1 final digest
*/
int mbedtls_sha1_finish_ret( mbedtls_sha1_context *ctx, unsigned char output[20] )
{
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_sha1_update_ret( ctx, sha1_padding, padn ) ) != 0 ) {
return ret;
}
if ( ( ret = mbedtls_sha1_update_ret( ctx, msglen, 8 ) ) != 0 ) {
return ret;
}
memcpy(output, ctx->state, 20);
return ret;
}
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_finish( mbedtls_sha1_context *ctx,
unsigned char output[20] )
{
mbedtls_sha1_finish_ret( ctx, output );
}
#endif
#endif /* MBEDTLS_SHA1_C && MBEDTLS_SHA1_ALT */