[#EVP_PKEY_asn1_set_siginf]
= EVP_PKEY_asn1_set_siginf
:mrdocs:

Install the X509_SIG_INFO setup callback on an EVP_PKEY_ASN1_METHOD.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_PKEY_asn1_set_siginf(
    xref:EVP_PKEY_ASN1_METHOD.adoc[EVP_PKEY_ASN1_METHOD]* ameth,
    int(* siginf_set)(xref:X509_SIG_INFO.adoc[X509_SIG_INFO]*, xref:X509_ALGOR.adoc[X509_ALGOR] const*, xref:ASN1_STRING.adoc[ASN1_STRING] const*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ameth*
| ASN.1 method being customized.
| *siginf_set*
| Callback that fills signature metadata from `alg` and `sig,` or NULL to clear.
|===


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