esp-idf/components/mbedtls/port/sha/block/esp_sha1.c
2022-06-23 11:01:16 +08:00

213 lines
4.9 KiB
C

/*
* SHA-1 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-1 standard was published by NIST in 1993.
*
* http://www.itl.nist.gov/fipspubs/fip180-1.htm
*/
#include <mbedtls/build_info.h>
#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_SHA1_ALT)
#include "mbedtls/sha1.h"
#include <string.h>
#include <assert.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_block.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 )
{
assert(ctx != NULL);
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( mbedtls_sha1_context *ctx )
{
ctx->total[0] = 0;
ctx->total[1] = 0;
memset( ctx, 0, sizeof( mbedtls_sha1_context ) );
ctx->mode = SHA1;
return 0;
}
static void esp_internal_sha1_block_process(mbedtls_sha1_context *ctx, const uint8_t *data)
{
esp_sha_block(SHA1, data, ctx->first_block);
if (ctx->first_block) {
ctx->first_block = false;
}
}
int mbedtls_internal_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[64] )
{
esp_sha_acquire_hardware();
esp_sha_block(ctx->mode, data, ctx->first_block);
esp_sha_release_hardware();
return 0;
}
int mbedtls_sha1_update( mbedtls_sha1_context *ctx, const unsigned char *input, size_t ilen )
{
size_t fill;
uint32_t left, 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;
}
if ( (ilen >= 64) || 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) {
esp_sha_write_digest_state(SHA1, ctx->state);
}
/* First process buffered block, if any */
if ( local_len ) {
esp_internal_sha1_block_process(ctx, ctx->buffer);
}
while ( ilen >= 64 ) {
esp_internal_sha1_block_process(ctx, input);
input += 64;
ilen -= 64;
}
esp_sha_read_digest_state(SHA1, ctx->state);
esp_sha_release_hardware();
}
if ( ilen > 0 ) {
memcpy( (void *) (ctx->buffer + left), input, ilen);
}
return 0;
}
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( 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( ctx, sha1_padding, padn ) ) != 0 ) {
return ret;
}
if ( ( ret = mbedtls_sha1_update( ctx, msglen, 8 ) ) != 0 ) {
return ret;
}
memcpy(output, ctx->state, 20);
return ret;
}
#endif /* MBEDTLS_SHA1_C && MBEDTLS_SHA1_ALT */