[#RAND_set_DRBG_type]
= RAND_set_DRBG_type
:mrdocs:

Configure the primary DRBG algorithm type for a library context.

== Synopsis

Declared in `<openssl/rand.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
RAND_set_DRBG_type(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* ctx,
    char const* drbg,
    char const* propq,
    char const* cipher,
    char const* digest);
----

== Description

Must be called before the DRBGs are first instantiated for `ctx.`

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Library context whose RNG is configured, or NULL for the default.
| *drbg*
| DRBG algorithm name (for example "HASH‐DRBG" or "CTR‐DRBG"), or NULL for the default.
| *propq*
| Property query for fetching the DRBG, or NULL.
| *cipher*
| Cipher name required by CTR‐DRBG, or NULL when unused.
| *digest*
| Digest name required by HASH‐DRBG/HMAC‐DRBG, or NULL when unused.
|===


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