[#RSA_generate_key]
= RSA_generate_key
:mrdocs:

Generate an RSA key pair (very old API; deprecated — prefer RSA_generate_key_ex).

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:RSA.adoc[RSA]*
RSA_generate_key(
    int bits,
    unsigned long e,
    void(* callback)(int, int, void*),
    void* cb_arg);
----

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

New RSA key pair, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bits*
| Modulus size in bits.
| *e*
| Public exponent (for example 65537).
| *callback*
| Optional progress callback, or NULL.
| *cb_arg*
| Opaque argument passed to `callback.`
|===


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