[#EVP_RAND_reseed]
= EVP_RAND_reseed
:mrdocs:

Reseed a DRBG/RAND context with optional entropy and additional input.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_RAND_reseed(
    xref:EVP_RAND_CTX.adoc[EVP_RAND_CTX]* ctx,
    int prediction_resistance,
    unsigned char const* ent,
    size_t ent_len,
    unsigned char const* addin,
    size_t addin_len);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| RAND context to reseed.
| *prediction_resistance*
| Nonzero to request prediction resistance when supported.
| *ent*
| Optional entropy bytes, or NULL to let the implementation gather entropy.
| *ent_len*
| Length of `ent.`
| *addin*
| Optional additional input bytes, or NULL.
| *addin_len*
| Length of `addin.`
|===


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