[#EC_KEY_METHOD_set_sign]
= EC_KEY_METHOD_set_sign
:mrdocs:

Install ECDSA signing callbacks on an EC_KEY_METHOD.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
EC_KEY_METHOD_set_sign(
    xref:EC_KEY_METHOD.adoc[EC_KEY_METHOD]* meth,
    int(* sign)(int, unsigned char const*, int, unsigned char*, unsigned int*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BIGNUM.adoc[BIGNUM] const*, xref:EC_KEY.adoc[EC_KEY]*),
    int(* sign_setup)(xref:EC_KEY.adoc[EC_KEY]*, xref:BN_CTX.adoc[BN_CTX]*, xref:BIGNUM.adoc[BIGNUM]**, xref:BIGNUM.adoc[BIGNUM]**),
    xref:ECDSA_SIG.adoc[ECDSA_SIG]*(* sign_sig)(unsigned char const*, int, xref:BIGNUM.adoc[BIGNUM] const*, xref:BIGNUM.adoc[BIGNUM] const*, xref:EC_KEY.adoc[EC_KEY]*));
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Description

Deprecated; custom EC_KEY_METHOD signing is superseded by providers.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *meth*
| Method object to update.
| *sign*
| Optional ECDSA_sign‐style callback (type, digest, signature buffer).
| *sign_setup*
| Optional precomputation of kinv/r for signing.
| *sign_sig*
| Optional callback that returns an ECDSA_SIG structure.
|===


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