Add MBEDTLS_ENTROPY_HARDWARE_ALT

Makes it easier for an external module to plug its hardware entropy collector.
parent bf82ff02
......@@ -277,6 +277,19 @@
//#define MBEDTLS_AES_ENCRYPT_ALT
//#define MBEDTLS_AES_DECRYPT_ALT
/**
* \def MBEDTLS_EMTROPY_HARDWARE_ALT
*
* Uncomment this macro to let mbed TLS use your own implementation of a
* hardware entropy collector.
*
* Your function must be called \c mbedtls_hardware_poll(), have the same
* prototype as declared in entropy_poll.h, and accept NULL as first argument.
*
* Uncomment to use your own hardware entropy collector.
*/
//#define MBEDTLS_ENTROPY_HARDWARE_ALT
/**
* \def MBEDTLS_AES_ROM_TABLES
*
......
......@@ -42,6 +42,7 @@ 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() */
#define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */
#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
/**
......@@ -69,6 +70,19 @@ int mbedtls_hardclock_poll( void *data,
unsigned char *output, size_t len, size_t *olen );
#endif
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
/**
* \brief Entropy poll callback for a hardware source
*
* \warning This is not provided by mbed TLS!
* See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
*
* \note This must accept NULL as its first argument.
*/
int mbedtls_hardware_poll( void *data,
unsigned char *output, size_t len, size_t *olen );
#endif
#ifdef __cplusplus
}
#endif
......
......@@ -86,6 +86,10 @@ void mbedtls_entropy_init( mbedtls_entropy_context *ctx )
mbedtls_entropy_add_source( ctx, mbedtls_havege_poll, &ctx->havege_data,
MBEDTLS_ENTROPY_MIN_HAVEGE );
#endif
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
mbedtls_entropy_add_source( ctx, mbedtls_hardware_poll, NULL
MBEDTLS_ENTROPY_MIN_HARDWARE );
#endif
#endif /* MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES */
}
......
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