[#EVP_DigestUpdate]
= EVP_DigestUpdate
:mrdocs:

Hash more input bytes into an initialized message‐digest context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_DigestUpdate(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    void const* d,
    size_t cnt);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context previously set up with EVP_DigestInit_ex() or similar.
| *d*
| Bytes to absorb.
| *cnt*
| Number of bytes at `d.`
|===


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