[#EC_GROUP_set_seed]
= EC_GROUP_set_seed
:mrdocs:

Set the optional seed bytes associated with an EC_GROUP.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
EC_GROUP_set_seed(
    xref:EC_GROUP.adoc[EC_GROUP]* group,
    unsigned char const* seed,
    size_t len);
----

== Return Value

The seed length stored on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *group*
| Group whose seed is updated.
| *seed*
| Seed octets to copy, or NULL to clear when `len` is 0.
| *len*
| Number of bytes at `seed.`
|===


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