[#EVP_PKEY_asn1_set_siginf]
= EVP&lowbar;PKEY&lowbar;asn1&lowbar;set&lowbar;siginf
:mrdocs:

Install the X509&lowbar;SIG&lowbar;INFO setup callback on an EVP&lowbar;PKEY&lowbar;ASN1&lowbar;METHOD&period;

== Synopsis

Declared in `&lt;openssl&sol;evp&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP&lowbar;PKEY&lowbar;asn1&lowbar;set&lowbar;siginf(
    xref:EVP_PKEY_ASN1_METHOD.adoc[EVP&lowbar;PKEY&lowbar;ASN1&lowbar;METHOD]* ameth,
    int(* siginf&lowbar;set)(xref:X509_SIG_INFO.adoc[X509&lowbar;SIG&lowbar;INFO]*, xref:X509_ALGOR.adoc[X509&lowbar;ALGOR] const*, xref:ASN1_STRING.adoc[ASN1&lowbar;STRING] const*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ameth*
| ASN&period;1 method being customized&period;
| *siginf&lowbar;set*
| Callback that fills signature metadata from `alg` and `sig,` or NULL to clear&period;
|===


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