[#EVP_PKEY_CTX_set_dh_pad]
= EVP_PKEY_CTX_set_dh_pad
:mrdocs:

Enable or disable leading‐zero padding of the DH shared secret to the prime length.

== Synopsis

Declared in `<openssl/dh.h>`

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

== Return Value

1 on success, or a negative value for unsupported / failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key‐derivation / derive context for a DH key.
| *pad*
| Non‐zero to pad the secret to BN_num_bytes(p); 0 to return the minimal big‐endian form.
|===


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