OSSL_ITEM - OpenSSL Core type for generic itemized data

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       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
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3.5.0                                              2025-06-04                                    OSSL_ITEM(3SSL)

       This type is a tuple of integer and pointer.  It's a generic type used as a generic descriptor, its exact
       meaning being defined by how it's used.  Arrays of this type are passed between the OpenSSL libraries and
       the providers, and must be terminated with a tuple where the integer is zero and the pointer NULL.

       This is currently mainly used for the return value of the provider's error reason strings array, see
       "Provider Functions" in provider-base(7).

OSSL_ITEM was added in OpenSSL 3.0

       OSSL_ITEM - OpenSSL Core type for generic itemized data

crypto(7), provider-base(7), openssl-core.h(7)

        #include <openssl/core.h>

        typedef struct ossl_item_st OSSL_ITEM;
        struct ossl_item_st {
            unsigned int id;
            void *ptr;
        };