[#EVP_DigestVerifyUpdate]
= EVP&lowbar;DigestVerifyUpdate
:mrdocs:

Hash more message bytes into an initialized DigestVerify context&period;

== Synopsis

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

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

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Verification context from EVP&lowbar;DigestVerifyInit() or EVP&lowbar;DigestVerifyInit&lowbar;ex()&period;
| *data*
| Bytes to absorb into the verification hash&period;
| *dsize*
| Number of bytes at `data&period;`
|===


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