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Improve changelog
Signed-off-by: Janos Follath <janos.follath@arm.com>
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Changes
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* Changed the default MBEDTLS_ECP_WINDOW_SIZE from 2 to 3.
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The correlation between this define and RSA decryption performance has
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changed lately due to security hardening.
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To fix the performance degradation when using default values the
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window was increased from 2 to 3.
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* mbedtls_mpi_exp_mod and code that uses it, notably RSA and DHM operations,
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have changed their speed/memory compromise as part of a proactive security
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improvement. The new default value of MBEDTLS_MPI_WINDOW_SIZE roughly
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preserves the current speed, at the expense of increasing memory
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consumption.
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