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Documentation and entropy self test changes (#610)
Ensure that the entropy self test always fails whenever MBEDTLS_TEST_NULL_ENTROPY is defined. This is because the option is meant to be for testing and development purposes rather than production quality software. Also, this patch enhances the documentation for mbedtls_entropy_source_self_test() and mbedtls_entropy_self_test().
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@ -255,6 +255,9 @@ int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *
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/**
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* \brief Checkup routine
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*
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* This module self-test also calls the entropy self-test,
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* mbedtls_entropy_source_self_test();
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*
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* \return 0 if successful, or 1 if a test failed
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*/
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int mbedtls_entropy_self_test( int verbose );
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@ -263,6 +266,14 @@ int mbedtls_entropy_self_test( int verbose );
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/**
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* \brief Checkup routine
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*
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* Verifies the integrity of the hardware entropy source
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* provided by the function 'mbedtls_hardware_poll()'.
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*
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* Note this is the only hardware entropy source that is known
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* at link time, and other entropy sources configured
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* dynamically at runtime by the function
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* mbedtls_entropy_add_source() will not be tested.
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*
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* \return 0 if successful, or 1 if a test failed
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*/
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int mbedtls_entropy_source_self_test( int verbose );
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@ -575,7 +575,7 @@ cleanup:
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*/
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int mbedtls_entropy_self_test( int verbose )
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{
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int ret = 0;
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int ret = 1;
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mbedtls_entropy_context ctx;
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
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unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
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@ -584,6 +584,7 @@ int mbedtls_entropy_self_test( int verbose )
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if( verbose != 0 )
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mbedtls_printf( " ENTROPY test: " );
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#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
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mbedtls_entropy_init( &ctx );
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/* First do a gather to make sure we have default sources */
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@ -631,6 +632,7 @@ int mbedtls_entropy_self_test( int verbose )
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cleanup:
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mbedtls_entropy_free( &ctx );
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#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
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if( verbose != 0 )
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{
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