On 11/11/2022 12:41, fus@xxxxxxxxxxxxxx wrote:
My apologies. I tested the code you supplied and of course it also fails
with 1.1.1. The code was changed without my knowledge when updating to
3.0 and the version that was working used the deprecated
"EC_POINT_point2oct". During my test I missed this.
Concerning the questions James akesd: I extract the key from an X509
certificate (with X509_get0_pubkey). And as you suggested I just need
the bytes of the public EC point. As a reference to which I want to
compare this data I only have the raw public key and a proprietarily
encoded curve id which I also check.
I'd like to come back to the question : how can I get the raw public
key^without using deprecated functionality?
Frank
Probably calling EVP_PKEY_get_octet_string_param() and asking for the
parameter OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY should do it. See these man
pages:
https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_get_params.html
https://www.openssl.org/docs/man3.0/man7/EVP_PKEY-EC.html
Matt
