[#BN_CTX_new_ex]
= BN_CTX_new_ex
:mrdocs:

Allocate a BN_CTX associated with library context `ctx.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BN_CTX.adoc[BN_CTX]*
BN_CTX_new_ex(xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* ctx);
----

== Return Value

New BN_CTX, or NULL on allocation failure; free with BN_CTX_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Library context for provider‐aware temporaries, or NULL for the default.
|===


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