[#ASN1_item_digest]
= ASN1_item_digest
:mrdocs:

Digest the ASN.1 encoding of `data` as described by `it.`

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_item_digest(
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it,
    xref:EVP_MD.adoc[EVP_MD] const* type,
    void* data,
    unsigned char* md,
    unsigned int* len);
----

== Return Value

* 1 on success, or 0 on failure.
* 1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *it*
| ASN.1 item describing the type of `data.`
| *type*
| Digest algorithm used to hash the DER encoding.
| *data*
| Structure to encode and digest.
| *md*
| Buffer that receives the digest bytes (at least EVP_MD_size(`type)).`
| *len*
| Receives the digest length in bytes.
|===


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