[#PKCS7_digest_from_attributes]
= PKCS7_digest_from_attributes
:mrdocs:

Extract the message‐digest OCTET STRING from a set of authenticatedAttributes.

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:ASN1_OCTET_STRING.adoc[ASN1_OCTET_STRING]*
PKCS7_digest_from_attributes(xref:stack_st_X509_ATTRIBUTE.adoc[stack_st_X509_ATTRIBUTE]* sk);
----

== Return Value

Pointer to the digest octets within `sk,` or NULL if absent; do not free.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *sk*
| Attribute stack from a PKCS7_SIGNER_INFO.
|===


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