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Add config macro for min bytes hw entropy

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Andres AG 2016-09-23 17:58:49 +01:00 committed by Simon Butcher
parent f84f8926a7
commit 7abc974ec4
4 changed files with 8 additions and 1 deletions
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3
ChangeLog
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@ -12,6 +12,9 @@ Features
calling mbedtls_x509_crt_parse_path().
* Added a configuration file config-no-entropy.h that enables a subset of
library features that do not require an entropy source.
* Added the macro MBEDTLS_ENTROPY_MIN_HARDWARE in config.h. This allows users
to configure the minimum number of bytes for entropy sources using the
mbedtls_hardware_poll() function.
Bugfix
* Fix for platform time abstraction to avoid dependency issues where a build

3
configs/config-no-entropy.h
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@ -22,7 +22,8 @@
* Minimal configuration of features that do not require an entropy source
* Distinguishing reatures:
* - no entropy module
* - no TLS protocol implementation available due missing entropy source
* - no TLS protocol implementation available due to absence of an entropy
* source
*
* See README.txt for usage instructions.
*/

1
include/mbedtls/config.h
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@ -2509,6 +2509,7 @@
/* Entropy options */
//#define MBEDTLS_ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
//#define MBEDTLS_ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
//#define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Default minimum number of bytes required for the hardware entropy source mbedtls_hardware_poll() before entropy is released */
/* Memory buffer allocator options */
//#define MBEDTLS_MEMORY_ALIGN_MULTIPLE 4 /**< Align on multiples of this value */

2
include/mbedtls/entropy_poll.h
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@ -41,7 +41,9 @@ extern "C" {
#define MBEDTLS_ENTROPY_MIN_PLATFORM 32 /**< Minimum for platform source */
#define MBEDTLS_ENTROPY_MIN_HAVEGE 32 /**< Minimum for HAVEGE */
#define MBEDTLS_ENTROPY_MIN_HARDCLOCK 4 /**< Minimum for mbedtls_timing_hardclock() */
#if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE)
#define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */
#endif
/**
* \brief Entropy poll callback that provides 0 entropy.