[#EVP_DigestSignInit]
= EVP_DigestSignInit
:mrdocs:

Initialise `ctx` for a one‐shot or streaming DigestSign with key `pkey.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_DigestSignInit(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]** pctx,
    xref:EVP_MD.adoc[EVP_MD] const* type,
    xref:ENGINE.adoc[ENGINE]* e,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest/sign context to initialise.
| *pctx*
| Optional out‐parameter receiving the internal EVP_PKEY_CTX, or NULL.
| *type*
| Digest to use, or NULL for algorithms that do not take a separate MD.
| *e*
| Legacy ENGINE, or NULL.
| *pkey*
| Private key used for signing.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#