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Use recently-introduced platform_util module

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This commit is contained in:
Manuel Pégourié-Gonnard
2018-05-24 13:46:15 +02:00
parent 3798b6be6b
commit fb78c90138
3 changed files with 20 additions and 30 deletions
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23
library/chacha20.c
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@ -22,7 +22,6 @@
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#include "mbedtls/chacha20.h"
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
@ -32,7 +31,8 @@
#if defined(MBEDTLS_CHACHA20_C)
#if !defined(MBEDTLS_CHACHA20_ALT)
#include "mbedtls/chacha20.h"
#include "mbedtls/platform_util.h"
#include <stddef.h>
#include <string.h>
@ -46,6 +46,8 @@
#endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST */
#if !defined(MBEDTLS_CHACHA20_ALT)
#define BYTES_TO_U32_LE( data, offset ) \
( (uint32_t) data[offset] \
| (uint32_t) ( (uint32_t) data[( offset ) + 1] << 8 ) \
@ -59,11 +61,6 @@
#define CHACHA20_BLOCK_SIZE_BYTES ( 4U * 16U )
/* 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;
}
/**
* \brief ChaCha20 quarter round operation.
*
@ -182,9 +179,9 @@ void mbedtls_chacha20_init( mbedtls_chacha20_context *ctx )
{
if ( ctx != NULL )
{
mbedtls_zeroize( ctx->initial_state, sizeof( ctx->initial_state ) );
mbedtls_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
mbedtls_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
mbedtls_platform_zeroize( ctx->initial_state, sizeof( ctx->initial_state ) );
mbedtls_platform_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
mbedtls_platform_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
/* Initially, there's no keystream bytes available */
ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
@ -195,7 +192,7 @@ void mbedtls_chacha20_free( mbedtls_chacha20_context *ctx )
{
if ( ctx != NULL )
{
mbedtls_zeroize( ctx, sizeof( mbedtls_chacha20_context ) );
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_chacha20_context ) );
}
}
@ -243,8 +240,8 @@ int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
ctx->initial_state[14] = BYTES_TO_U32_LE( nonce, 4 );
ctx->initial_state[15] = BYTES_TO_U32_LE( nonce, 8 );
mbedtls_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
mbedtls_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
mbedtls_platform_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
mbedtls_platform_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
/* Initially, there's no keystream bytes available */
ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;