[#EVP_PKEY_get_default_digest_name]
= EVP_PKEY_get_default_digest_name
:mrdocs:

Write the default digest name recommended for signing with `pkey.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_default_digest_name(
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    char* mdname,
    size_t mdname_sz);
----

== Return Value

1 if a default digest is required, 2 if any digest is allowed, or a negative/zero value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key whose signature defaults are queried.
| *mdname*
| Output buffer receiving a NUL‐terminated digest name (for example "SHA256").
| *mdname_sz*
| Capacity of `mdname` in bytes.
|===


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