fix: input length for ECCX08.ecSign() is 32 bytes

[fogzot]

When using ECCX08.ecSign() the input buffer should be exactly 32 bytes long. The old example worked only because the signature was generated and then checked on the first 32 bytes of the 64 bytes buffer.

[CLAassistant]

All committers have signed the CLA.

[github-actions[bot]]

Memory usage change @ b7f79d8fdc77bbe4921378eb014a2f4ebb39585e

Board	flash	%	RAM for global variables	%
arduino:mbed:envie_m7	:green_heart: -32 - 0	-0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed_nano:nanorp2040connect	:green_heart: -32 - 0	-0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:megaavr:uno2018	:green_heart: -20 - 0	-0.04 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkr1000	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrgsm1400	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrnb1500	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrvidor4000	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrwan1300	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrwan1310	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrwifi1010	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:nano_33_iot	:green_heart: -32 - 0	-0.01 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board|`examples/ECCX08HMAC`
flash|%|`examples/ECCX08HMAC`
RAM for global variables|%|`examples/ECCX08RandomNumber`
flash|%|`examples/ECCX08RandomNumber`
RAM for global variables|%|`examples/ECCX08Signing`
flash|%|`examples/ECCX08Signing`
RAM for global variables|%|`examples/Tools/ECCX08CSR`
flash|%|`examples/Tools/ECCX08CSR`
RAM for global variables|%|`examples/Tools/ECCX08JWSPublicKey`
flash|%|`examples/Tools/ECCX08JWSPublicKey`
RAM for global variables|%|`examples/Tools/ECCX08SelfSignedCert`
flash|%|`examples/Tools/ECCX08SelfSignedCert`
RAM for global variables|% -|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|- `arduino:mbed:envie_m7`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:mbed_nano:nanorp2040connect`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:megaavr:uno2018`|0|0.0|0|0.0|0|0.0|0|0.0|-20|-0.04|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkr1000`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkrgsm1400`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkrnb1500`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkrvidor4000`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkrwan1300`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkrwan1310`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:mkrwifi1010`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0 `arduino:samd:nano_33_iot`|0|0.0|0|0.0|0|0.0|0|0.0|-32|-0.01|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0|0|0.0

Click for full report CSV

``` Board,examples/ECCX08HMAC
flash,%,examples/ECCX08HMAC
RAM for global variables,%,examples/ECCX08RandomNumber
flash,%,examples/ECCX08RandomNumber
RAM for global variables,%,examples/ECCX08Signing
flash,%,examples/ECCX08Signing
RAM for global variables,%,examples/Tools/ECCX08CSR
flash,%,examples/Tools/ECCX08CSR
RAM for global variables,%,examples/Tools/ECCX08JWSPublicKey
flash,%,examples/Tools/ECCX08JWSPublicKey
RAM for global variables,%,examples/Tools/ECCX08SelfSignedCert
flash,%,examples/Tools/ECCX08SelfSignedCert
RAM for global variables,% arduino:mbed:envie_m7,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:mbed_nano:nanorp2040connect,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:megaavr:uno2018,0,0.0,0,0.0,0,0.0,0,0.0,-20,-0.04,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkr1000,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkrgsm1400,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkrnb1500,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkrvidor4000,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkrwan1300,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkrwan1310,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:mkrwifi1010,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 arduino:samd:nano_33_iot,0,0.0,0,0.0,0,0.0,0,0.0,-32,-0.01,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0 ```

[manchoz]

@pennam, would you mind to review? Thanks!

[pennam]

:+1: Thanks for the fix @fogzot