[#EVP_PKEY_CTX_set_dh_paramgen_seed]
= EVP_PKEY_CTX_set_dh_paramgen_seed
:mrdocs:

Set a fixed seed for DH parameter generation (testing / reproducible params).

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set_dh_paramgen_seed(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char const* seed,
    size_t seedlen);
----

== Description

Persist `seed` if later validation of p, q, and verifiable g is required; it is not part of a stored key.

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| EVP_PKEY_CTX configured for DH parameter generation.
| *seed*
| Seed octets used instead of a random seed; must yield primes on the first iteration.
| *seedlen*
| Length of `seed` in bytes.
|===


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