[#EVP_RAND_generate]
= EVP_RAND_generate
:mrdocs:

Generate random bytes from a RAND context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| RAND context to draw from.
| *out*
| Buffer receiving random octets.
| *outlen*
| Number of bytes to generate.
| *strength*
| Requested security strength in bits (0 selects the context default).
| *prediction_resistance*
| Non‐zero to request prediction resistance / reseed before output.
| *addin*
| Optional additional input mixed into the generation, or NULL.
| *addin_len*
| Length of `addin` in bytes.
|===


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