[#ASN1_item_sign]
= ASN1_item_sign
:mrdocs:

Sign the DER encoding of an ASN.1 value described by `it.`

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_item_sign(
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it,
    xref:X509_ALGOR.adoc[X509_ALGOR]* algor1,
    xref:X509_ALGOR.adoc[X509_ALGOR]* algor2,
    xref:ASN1_BIT_STRING.adoc[ASN1_BIT_STRING]* signature,
    void const* data,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:EVP_MD.adoc[EVP_MD] const* md);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *it*
| ASN.1 item descriptor for `data.`
| *algor1*
| Optional AlgorithmIdentifier to set for the signature algorithm, or NULL.
| *algor2*
| Optional second AlgorithmIdentifier to set (for example in certificates), or NULL.
| *signature*
| Destination BIT STRING that receives the signature bits.
| *data*
| Object to encode with `it` and sign.
| *pkey*
| Private key used for signing.
| *md*
| Message digest, or NULL to use a key‐type default where applicable.
|===


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