[#EVP_PKEY_asn1_set_public]
= EVP_PKEY_asn1_set_public
:mrdocs:

Install public‐key decode, encode, compare, print, size, and bits callbacks on an ASN.1 method.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_PKEY_asn1_set_public(
    xref:EVP_PKEY_ASN1_METHOD.adoc[EVP_PKEY_ASN1_METHOD]* ameth,
    int(* pub_decode)(xref:EVP_PKEY.adoc[EVP_PKEY]*, xref:X509_PUBKEY.adoc[X509_PUBKEY] const*),
    int(* pub_encode)(xref:X509_PUBKEY.adoc[X509_PUBKEY]*, xref:EVP_PKEY.adoc[EVP_PKEY] const*),
    int(* pub_cmp)(xref:EVP_PKEY.adoc[EVP_PKEY] const*, xref:EVP_PKEY.adoc[EVP_PKEY] const*),
    int(* pub_print)(xref:BIO.adoc[BIO]*, xref:EVP_PKEY.adoc[EVP_PKEY] const*, int, xref:ASN1_PCTX.adoc[ASN1_PCTX]*),
    int(* pkey_size)(xref:EVP_PKEY.adoc[EVP_PKEY] const*),
    int(* pkey_bits)(xref:EVP_PKEY.adoc[EVP_PKEY] const*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ameth*
| ASN.1 method being customized.
| *pub_decode*
| Decode an X509_PUBKEY into `pk.`
| *pub_encode*
| Encode `pk` into an X509_PUBKEY.
| *pub_cmp*
| Compare two public keys (1 match, 0 differ, negative on error).
| *pub_print*
| Print the public key to a BIO.
| *pkey_size*
| Return the maximum output size in bytes for operations with `pk.`
| *pkey_bits*
| Return the key size in bits for `pk.`
|===


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