[#PEM_read_RSA_PUBKEY]
= PEM_read_RSA_PUBKEY
:mrdocs:

Read an RSA SubjectPublicKeyInfo from a PEM‐encoded FILE (deprecated).

== Synopsis

Declared in `<openssl/pem.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:RSA.adoc[RSA]*
PEM_read_RSA_PUBKEY(
    FILE* fp,
    xref:RSA.adoc[RSA]** x,
    xref:pem_password_cb.adoc[pem_password_cb]* cb,
    void* u);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

RSA key on success, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fp*
| FILE to read from.
| *x*
| Optional address of an RSA pointer to reuse, or NULL.
| *cb*
| Password callback for encrypted PEM, or NULL.
| *u*
| Application data passed to `cb.`
|===


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