[#EVP_DigestUpdate]
= EVP&lowbar;DigestUpdate
:mrdocs:

Hash more input bytes into an initialized message&hyphen;digest context&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP&lowbar;DigestUpdate(
    xref:EVP_MD_CTX.adoc[EVP&lowbar;MD&lowbar;CTX]* ctx,
    void const* d,
    size&lowbar;t cnt);
----

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context previously set up with EVP&lowbar;DigestInit&lowbar;ex() or similar&period;
| *d*
| Bytes to absorb&period;
| *cnt*
| Number of bytes at `d&period;`
|===


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