[#PKCS7_add1_attrib_digest]
= PKCS7_add1_attrib_digest
:mrdocs:

Add a PKCS#9 messageDigest authenticated attribute to a SignerInfo.

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS7_add1_attrib_digest(
    xref:PKCS7_SIGNER_INFO.adoc[PKCS7_SIGNER_INFO]* si,
    unsigned char const* md,
    int mdlen);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo to update.
| *md*
| Digest octets to embed (copied into a new ASN1_OCTET_STRING).
| *mdlen*
| Length of `md` in bytes.
|===


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