[#EVP_DigestInit]
= EVP&lowbar;DigestInit
:mrdocs:

Initialize a digest context for hashing with `type` (legacy ENGINE&hyphen;aware form)&period;

== Synopsis

Declared in `&lt;openssl&sol;evp&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP&lowbar;DigestInit(
    xref:EVP_MD_CTX.adoc[EVP&lowbar;MD&lowbar;CTX]* ctx,
    xref:EVP_MD.adoc[EVP&lowbar;MD] const* type);
----

== Description

Prefer EVP&lowbar;DigestInit&lowbar;ex2() for new code&period;

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context to initialize&period;
| *type*
| Digest method to use, or NULL to clear&period;
|===


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