[#ECDSA_sign_setup]
= ECDSA_sign_setup
:mrdocs:

Precompute parts of the signing operation

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ECDSA_sign_setup(
    xref:EC_KEY.adoc[EC_KEY]* eckey,
    xref:BN_CTX.adoc[BN_CTX]* ctx,
    xref:BIGNUM.adoc[BIGNUM]** kinv,
    xref:BIGNUM.adoc[BIGNUM]** rp);
----

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

1 on success and 0 otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *eckey*
| EC_KEY object containing a private EC key
| *ctx*
| BN_CTX object (optional)
| *kinv*
| BIGNUM pointer for the inverse of k
| *rp*
| BIGNUM pointer for x coordinate of k * generator
|===


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