sha256 hash hardware acceleration?

[torntrousers]

Board

M5Stack EduKit

Device Description

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Hardware Configuration

.

Version

v2.0.3

IDE Name

platformio

Operating System

Windows

Flash frequency

40MHz

PSRAM enabled

yes

Upload speed

115200

Description

I happened to be doing some testing of different sha256 impls and found that in my test mbedtls sha256 with esp32/arduino v2.0.3 was slower than v2.0.2, taking about 80 microseconds compared to 43 microseconds on v2.0.2, so nearly twice as slow.

I remember seeing this issue that I think is saying from 2.0.3 mbedtls will use the ESP32 hardware acceleration for things like mbedtls sha256 hashes.

Its not a big deal I'm just curious - shouldn't v2.0.3 be faster at this if its using hardware acceleration now?

I do have a testcase to show this if interested but would have to do some work to pullout just this sha256 test into a standalone project.

Sketch

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Debug Message

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Other Steps to Reproduce

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I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[VojtechBartoska]

@me-no-dev PTAL, thanks!

[me-no-dev]

@torntrousers actually it's slower in hardware, because the clock speed of the hardware is 80MHz and the CPU at 240MHz can calculate a bit faster. If the CPU was also at 80MHz, then hardware would have been twice faster or so...

[torntrousers]

I see, interesting. thanks.