[#EVP_DigestSignUpdate]
= EVP_DigestSignUpdate
:mrdocs:

Hash more message bytes into an initialized DigestSign context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Signing context from EVP_DigestSignInit() or EVP_DigestSignInit_ex().
| *data*
| Bytes to absorb into the signature hash.
| *dsize*
| Number of bytes at `data.`
|===


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