[#PEM_SignUpdate]
= PEM_SignUpdate
:mrdocs:

Absorb more message bytes into a PEM signing digest context.

== Synopsis

Declared in `<openssl/pem.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context initialised for PEM signing (for example via PEM_SignInit).
| *d*
| Message bytes to hash.
| *cnt*
| Number of bytes at `d.`
|===


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