[#ASN1_digest]
= ASN1_digest
:mrdocs:

Digest the DER encoding of an ASN.1 structure using a supplied i2d encoder (deprecated).

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ASN1_digest(
    xref:i2d_of_void.adoc[i2d_of_void]* i2d,
    xref:EVP_MD.adoc[EVP_MD] const* type,
    char* data,
    unsigned char* md,
    unsigned int* len);
----

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

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *i2d*
| Encoder function that serializes `data` to DER.
| *type*
| Message digest algorithm to apply to the DER encoding.
| *data*
| Pointer to the ASN.1 structure passed to `i2d.`
| *md*
| Output buffer receiving the digest.
| *len*
| Receives the digest length in bytes.
|===


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