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Make timing selftest less sensitive
- allow up to 12.5% security/error margin - use larger delays - this avoid the security/error margin being too low The test used to fail about 1 out of 6 times on some buildbots VMs, but never failed on the physical machines used for development.
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@ -429,25 +429,25 @@ int mbedtls_timing_self_test( int verbose )
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if( verbose != 0 )
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mbedtls_printf( " TIMING test #2 (set/get_delay ): " );
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for( a = 100; a <= 200; a += 100 )
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for( a = 200; a <= 400; a += 200 )
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{
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for( b = 100; b <= 200; b += 100 )
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for( b = 200; b <= 400; b += 200 )
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{
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mbedtls_timing_set_delay( &ctx, a, a + b );
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busy_msleep( a - a / 10 );
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busy_msleep( a - a / 8 );
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if( mbedtls_timing_get_delay( &ctx ) != 0 )
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FAIL;
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busy_msleep( a / 5 );
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busy_msleep( a / 4 );
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if( mbedtls_timing_get_delay( &ctx ) != 1 )
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FAIL;
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busy_msleep( b - a / 5 );
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busy_msleep( b - a / 8 - b / 8 );
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if( mbedtls_timing_get_delay( &ctx ) != 1 )
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FAIL;
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busy_msleep( b / 5 );
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busy_msleep( b / 4 );
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if( mbedtls_timing_get_delay( &ctx ) != 2 )
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FAIL;
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}
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