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Support for seed file writing and reading in Entropy

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This commit is contained in:
Paul Bakker 2014-03-26 11:54:05 +01:00
parent ec8e5db1cf
commit 1e9423704a
5 changed files with 96 additions and 0 deletions
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3
ChangeLog
View File

@ -1,6 +1,9 @@
PolarSSL ChangeLog
= Branch 1.2
Features
* Entropy module now supports seed writing and reading
Changes
* Introduced POLARSSL_HAVE_READDIR_R for systems without it
* Improvements to the CMake build system, contributed by Julian Ospald.

30
include/polarssl/entropy.h
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@ -39,6 +39,7 @@
#define POLARSSL_ERR_ENTROPY_SOURCE_FAILED -0x003C /**< Critical entropy source failure. */
#define POLARSSL_ERR_ENTROPY_MAX_SOURCES -0x003E /**< No more sources can be added. */
#define POLARSSL_ERR_ENTROPY_NO_SOURCES_DEFINED -0x0040 /**< No sources have been added to poll. */
#define POLARSSL_ERR_ENTROPY_FILE_IO_ERROR -0x0058 /**< Read/write error in file. */
#if !defined(POLARSSL_CONFIG_OPTIONS)
#define ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
@ -47,6 +48,7 @@
#define ENTROPY_BLOCK_SIZE 64 /**< Block size of entropy accumulator (SHA-512) */
#define ENTROPY_MAX_SEED_SIZE 1024 /**< Maximum size of seed we read from seed file */
#define ENTROPY_SOURCE_MANUAL ENTROPY_MAX_SOURCES
#ifdef __cplusplus
@ -146,6 +148,34 @@ int entropy_func( void *data, unsigned char *output, size_t len );
int entropy_update_manual( entropy_context *ctx,
const unsigned char *data, size_t len );
#if defined(POLARSSL_FS_IO)
/**
* \brief Write a seed file
*
* \param ctx Entropy context
* \param path Name of the file
*
* \return 0 if successful,
* POLARSSL_ERR_ENTROPY_FILE_IO_ERROR on file error, or
* POLARSSL_ERR_ENTROPY_SOURCE_FAILED
*/
int entropy_write_seed_file( entropy_context *ctx, const char *path );
/**
* \brief Read and update a seed file. Seed is added to this
* instance. No more than ENTROPY_MAX_SEED_SIZE bytes are
* read from the seed file. The rest is ignored.
*
* \param ctx Entropy context
* \param path Name of the file
*
* \return 0 if successful,
* POLARSSL_ERR_ENTROPY_FILE_IO_ERROR on file error,
* POLARSSL_ERR_ENTROPY_SOURCE_FAILED
*/
int entropy_update_seed_file( entropy_context *ctx, const char *path );
#endif
#ifdef __cplusplus
}
#endif

1
include/polarssl/error.h
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@ -62,6 +62,7 @@
* CTR_DBRG 3 0x0034-0x003A
* ENTROPY 3 0x003C-0x0040
* NET 11 0x0042-0x0056
* ENTROPY 1 0x0058-0x0058
* ASN1 7 0x0060-0x006C
* MD2 1 0x0070-0x0070
* MD4 1 0x0072-0x0072

60
library/entropy.c
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@ -30,6 +30,10 @@
#include "polarssl/entropy.h"
#include "polarssl/entropy_poll.h"
#if defined(POLARSSL_FS_IO)
#include <stdio.h>
#endif
#if defined(POLARSSL_HAVEGE_C)
#include "polarssl/havege.h"
#endif
@ -201,4 +205,60 @@ int entropy_func( void *data, unsigned char *output, size_t len )
return( 0 );
}
#if defined(POLARSSL_FS_IO)
int entropy_write_seed_file( entropy_context *ctx, const char *path )
{
int ret = POLARSSL_ERR_ENTROPY_FILE_IO_ERROR;
FILE *f;
unsigned char buf[ENTROPY_BLOCK_SIZE];
if( ( f = fopen( path, "wb" ) ) == NULL )
return( POLARSSL_ERR_ENTROPY_FILE_IO_ERROR );
if( ( ret = entropy_func( ctx, buf, ENTROPY_BLOCK_SIZE ) ) != 0 )
goto exit;
if( fwrite( buf, 1, ENTROPY_BLOCK_SIZE, f ) != ENTROPY_BLOCK_SIZE )
{
ret = POLARSSL_ERR_ENTROPY_FILE_IO_ERROR;
goto exit;
}
ret = 0;
exit:
fclose( f );
return( ret );
}
int entropy_update_seed_file( entropy_context *ctx, const char *path )
{
FILE *f;
size_t n;
unsigned char buf[ ENTROPY_MAX_SEED_SIZE ];
if( ( f = fopen( path, "rb" ) ) == NULL )
return( POLARSSL_ERR_ENTROPY_FILE_IO_ERROR );
fseek( f, 0, SEEK_END );
n = (size_t) ftell( f );
fseek( f, 0, SEEK_SET );
if( n > ENTROPY_MAX_SEED_SIZE )
n = ENTROPY_MAX_SEED_SIZE;
if( fread( buf, 1, n, f ) != n )
{
fclose( f );
return( POLARSSL_ERR_ENTROPY_FILE_IO_ERROR );
}
fclose( f );
entropy_update_manual( ctx, buf, n );
return( entropy_write_seed_file( ctx, path ) );
}
#endif /* POLARSSL_FS_IO */
#endif

2
library/error.c
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@ -508,6 +508,8 @@ void error_strerror( int ret, char *buf, size_t buflen )
snprintf( buf, buflen, "ENTROPY - No more sources can be added" );
if( use_ret == -(POLARSSL_ERR_ENTROPY_NO_SOURCES_DEFINED) )
snprintf( buf, buflen, "ENTROPY - No sources have been added to poll" );
if( use_ret == -(POLARSSL_ERR_ENTROPY_FILE_IO_ERROR) )
snprintf( buf, buflen, "ENTROPY - Read/write error in file" );
#endif /* POLARSSL_ENTROPY_C */
#if defined(POLARSSL_GCM_C)