[#EVP_DigestInit_ex2]
= EVP_DigestInit_ex2
:mrdocs:

Initialize a digest context with `type` and optional algorithm parameters.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_DigestInit_ex2(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    xref:EVP_MD.adoc[EVP_MD] const* type,
    xref:OSSL_PARAM.adoc[OSSL_PARAM] const params[]);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context to (re)initialize; must have been created with EVP_MD_CTX_new().
| *type*
| Digest algorithm, or NULL to reuse the algorithm already associated with `ctx.`
| *params*
| Optional OSSL_PARAM array applied to the digest (terminated by OSSL_PARAM_END), or NULL.
|===


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