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- Added option to prevent default entropy sources from loading (POLARSSL_NO_DEFAULT_ENTROPY_SOURCES)

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This commit is contained in:
Paul Bakker 2011-12-15 20:11:16 +00:00
parent fb3a83f9e3
commit 43655f46b0
5 changed files with 26 additions and 3 deletions
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13
include/polarssl/config.h
View file

@ -154,6 +154,19 @@
*/
#define POLARSSL_FS_IO
/**
* \def POLARSSL_NO_DEFAULT_ENTROPY_SOURCES
*
* Do not add default entropy sources. These are the platform specific,
* hardclock and HAVEGE based poll functions.
*
* This is useful to have more control over the added entropy sources in an
* application.
*
* Uncomment this macro to prevent loading of default entropy functions.
#define POLARSSL_NO_DEFAULT_ENTROPY_SOURCES
*/
/**
* \def POLARSSL_NO_PLATFORM_ENTROPY
*

3
include/polarssl/entropy.h
View file

@ -38,6 +38,7 @@
#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 ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
#define ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
@ -104,7 +105,7 @@ void entropy_init( entropy_context *ctx );
* \param threshold Minimum required from source before entropy is released
* ( with entropy_func() )
*
* \return 0 is successful or POLARSSL_ERR_ENTROPY_MAX_SOURCES
* \return 0 if successful or POLARSSL_ERR_ENTROPY_MAX_SOURCES
*/
int entropy_add_source( entropy_context *ctx,
f_source_ptr f_source, void *p_source,

2
include/polarssl/error.h
View file

@ -58,7 +58,7 @@
* DES 1 0x0032-0x0032
* NET 11 0x0040-0x0054
* CTR_DBRG 3 0x0034-0x003A
* ENTROPY 2 0x003C-0x003E
* ENTROPY 3 0x003C-0x0040
* MD2 1 0x0070-0x0070
* MD4 1 0x0072-0x0072
* MD5 1 0x0074-0x0074

9
library/entropy.c
View file

@ -41,7 +41,11 @@ void entropy_init( entropy_context *ctx )
memset( ctx, 0, sizeof(entropy_context) );
sha4_starts( &ctx->accumulator, 0 );
#if defined(POLARSSL_HAVEGE_C)
havege_init( &ctx->havege_data );
#endif
#if !defined(POLARSSL_NO_DEFAULT_ENTROPY_SOURCES)
#if !defined(POLARSSL_NO_PLATFORM_ENTROPY)
entropy_add_source( ctx, platform_entropy_poll, NULL,
ENTROPY_MIN_PLATFORM );
@ -50,10 +54,10 @@ void entropy_init( entropy_context *ctx )
entropy_add_source( ctx, hardclock_poll, NULL, ENTROPY_MIN_HARDCLOCK );
#endif
#if defined(POLARSSL_HAVEGE_C)
havege_init( &ctx->havege_data );
entropy_add_source( ctx, havege_poll, &ctx->havege_data,
ENTROPY_MIN_HAVEGE );
#endif
#endif /* POLARSSL_NO_DEFAULT_ENTROPY_SOURCES */
}
int entropy_add_source( entropy_context *ctx,
@ -117,6 +121,9 @@ int entropy_gather( entropy_context *ctx )
unsigned char buf[ENTROPY_MAX_GATHER];
size_t olen;
if( ctx->source_count == 0 )
return( POLARSSL_ERR_ENTROPY_NO_SOURCES_DEFINED );
/*
* Run through our entropy sources
*/

2
library/error.c
View file

@ -436,6 +436,8 @@ void error_strerror( int ret, char *buf, size_t buflen )
snprintf( buf, buflen, "ENTROPY - Critical entropy source failure" );
if( use_ret == -(POLARSSL_ERR_ENTROPY_MAX_SOURCES) )
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" );
#endif /* POLARSSL_ENTROPY_C */
#if defined(POLARSSL_MD2_C)