[#EVP_PKEY_CTX_set_dh_paramgen_subprime_len]
= EVP_PKEY_CTX_set_dh_paramgen_subprime_len
:mrdocs:

Set the DH parameter‐generation subprime (q) length in bits.

== Synopsis

Declared in `<openssl/dh.h>`

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

== Return Value

1 on success, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| EVP_PKEY_CTX configured for DH parameter generation.
| *qlen*
| Desired bit length of the subprime q.
|===


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