[#EVP_PKEY_CTX_set_rsa_keygen_primes]
= EVP_PKEY_CTX_set_rsa_keygen_primes
:mrdocs:

Set how many primes to use when generating a multi‐prime RSA key.

== Synopsis

Declared in `<openssl/rsa.h>`

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

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Keygen context for an RSA key type.
| *primes*
| Number of primes (2 for classic RSA; larger for multi‐prime).
|===


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