[#EVP_PKEY_CTX_set_rsa_keygen_bits]
= EVP_PKEY_CTX_set_rsa_keygen_bits
:mrdocs:

Set the RSA modulus size in bits for key generation on an EVP_PKEY_CTX.

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set_rsa_keygen_bits(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    int bits);
----

== Return Value

1 on success, or a non‐positive value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Keygen context for an RSA algorithm.
| *bits*
| Desired modulus length in bits (for example 2048 or 3072).
|===


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