[#EVP_RAND_instantiate]
= EVP_RAND_instantiate
:mrdocs:

Instantiate (seed) an EVP_RAND_CTX so it can generate random bytes.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_RAND_instantiate(
    xref:EVP_RAND_CTX.adoc[EVP_RAND_CTX]* ctx,
    unsigned int strength,
    int prediction_resistance,
    unsigned char const* pstr,
    size_t pstr_len,
    xref:OSSL_PARAM.adoc[OSSL_PARAM] const params[]);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| RNG context to instantiate.
| *strength*
| Requested security strength in bits.
| *prediction_resistance*
| Non‐zero to force a reseed from live entropy.
| *pstr*
| Optional personalization string, or NULL.
| *pstr_len*
| Length of `pstr` in bytes.
| *params*
| Optional OSSL_PARAM array of additional parameters, or NULL.
|===


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