sys/psa_crypto: correct use of (ECDSA) key_bits #20607
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Contribution description
The
key_bitsthat are part of thepsa_key_attributes_tare restricted to certain values in the PSA specification. An example is PSA_ECC_FAMILY_SECP_R1, which allows forkey_bits = 256, among others.However, in https://github.com/RIOT-OS/RIOT/blob/master/examples/psa_crypto/example_ecdsa_p256.c#L91,
key_bitswas set to the size of the exported key, which at least for PSA_ECC_FAMILY_SECP_R1 doesn't match the expectedkey_bits(as it is defined here to be1+2*key_bits).Fixing this revealed a unnecessary computation of the
curve_bits, which actually match thekey_bitsaccording to the specification. Removed the respective macros and adapted all their usage.Testing procedure
CI should suffice to see that compilation and the tests succeed.
Issues/PRs references
Fixes #20468.
Draft since blocked by #20545: the change inDone ✔️examples/psa_crypto/example_ecdsa_p256.cneeds to be copied totests/sys/psa_crypto_ecdsa*/example_ecdsa_p256.c