[#EVP_PKEY_asn1_set_item]
= EVP_PKEY_asn1_set_item
:mrdocs:

Install ASN.1 item sign and verify callbacks on an EVP_PKEY_ASN1_METHOD.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_PKEY_asn1_set_item(
    xref:EVP_PKEY_ASN1_METHOD.adoc[EVP_PKEY_ASN1_METHOD]* ameth,
    int(* item_verify)(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]*, xref:ASN1_ITEM.adoc[ASN1_ITEM] const*, void const*, xref:X509_ALGOR.adoc[X509_ALGOR] const*, xref:ASN1_BIT_STRING.adoc[ASN1_BIT_STRING] const*, xref:EVP_PKEY.adoc[EVP_PKEY]*),
    int(* item_sign)(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]*, xref:ASN1_ITEM.adoc[ASN1_ITEM] const*, void const*, xref:X509_ALGOR.adoc[X509_ALGOR]*, xref:X509_ALGOR.adoc[X509_ALGOR]*, xref:ASN1_BIT_STRING.adoc[ASN1_BIT_STRING]*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ameth*
| ASN.1 method being customized.
| *item_verify*
| Optional callback used by ASN1_item_verify() for custom signature verification, or NULL.
| *item_sign*
| Optional callback used by ASN1_item_sign() for custom signature generation, or NULL.
|===


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