There are 3 cases of "structure of NULL" where the "of" should be "or".
The "NULL" is actually "B<NULL>" in the pod file.
doc/man3/EVP_PKEY_CTX_new.pod
doc/man3/X509_NAME_add_entry_by_txt.pod
doc/man3/X509V3_get_d2i.pod
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There are several bugs/typos in the example code at the end of
doc/man3/EVP_MAC.pod
These lines have an extra NULL parameter.
OSSL_PARAM_construct_utf8_string("cipher", cipher, 0, NULL);
OSSL_PARAM_construct_utf8_string("digest", digest, 0, NULL);
OSSL_PARAM_construct_octet_string("key", key, strlen(key), NULL);
----------
That man page describes EVP_MAC_set_ctx_params and uses it in the example:
|| EVP_MAC_set_ctx_params(ctx, params) <= 0)
evp.h has:
int EVP_MAC_CTX_set_params(EVP_MAC_CTX *ctx, const OSSL_PARAM params[]);
That's "set_ctx" vs "CTX_set" in case your eyes doesn't instantly lock on to
the difference.
There are similar problems with many other ctx routines.
EVP_MAC_new_ctx => EVP_MAC_CTX_new
EVP_MAC_free_ctx => EVP_MAC_CTX_free
EVP_MAC_get_ctx_params ...
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