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Introduce platform-layer functions for reading/writing seed from NV

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Introduces mbedtls_nv_seed_read() and mbedtls_nv_seed_write().

The platform-layer functions are only available when
MBEDTLS_ENTROPY_NV_SEED is enabled.
This commit is contained in:
Paul Bakker 2016-06-01 11:25:44 +01:00 • committed by Simon Butcher
parent d2e7ff746d
commit cf0a9f96c5
4 changed files with 198 additions and 3 deletions
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89
library/platform.c
View file

@ -1,7 +1,7 @@
/*
* Platform abstraction layer
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@ -213,4 +213,91 @@ int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* time
}
#endif /* MBEDTLS_PLATFORM_TIME_ALT */
#if defined(MBEDTLS_ENTROPY_NV_SEED)
#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
/* Default implementations for the platform independent seed functions use
* standard libc file functions to read from and write to a pre-defined filename
*/
int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
{
FILE *file;
size_t n;
if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
return -1;
if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
{
fclose( file );
return -1;
}
fclose( file );
return( n );
}
int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
{
FILE *file;
size_t n;
if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
return -1;
if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
{
fclose( file );
return -1;
}
fclose( file );
return( n );
}
#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
{
((void) buf);
((void) buf_len);
return( -1 );
}
#define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
{
((void) buf);
((void) buf_len);
return( -1 );
}
#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit
#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
MBEDTLS_PLATFORM_STD_NV_SEED_READ;
int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
int mbedtls_platform_set_nv_seed(
int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
{
mbedtls_nv_seed_read = nv_seed_read_func;
mbedtls_nv_seed_write = nv_seed_write_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
#endif /* MBEDTLS_ENTROPY_NV_SEED */
#endif /* MBEDTLS_PLATFORM_C */