[#ossl_param_st-data_size]
= xref:ossl_param_st.adoc[ossl_param_st]::data_size
:relfileprefix: ../
:mrdocs:

Size in bytes of the buffer at `data` (or of the pointed‐to value for PTR types).

== Synopsis

Declared in `<openssl/core.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t data_size;
----


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