Meta-comment: The documentation is very thin on when objects should or
should not be freed. The application developer is forced to chose
between [don't free, leak memory] and [free, access freed memory].
~~
1 - The documentation here says this API is available, but I don't see
it in either the source or the installed header.
https://www.openssl.org/docs/manmaster/crypto/X509_get_pubkey.html
2 - The doc also says that X509_get_pubkey() can be used but "the
returned key must be freed up after use". It would be nice if it said
how to free it. I assume that EVP_PKEY_free() is correct.
3 - I use this sequence:
x509 = PEM_read_bio_X509
EVP_PKEY = X509_get_pubkey
RSA = EVP_PKEY_get1_RSA
What should be freed? All three structures or just a subset?
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