[#CMS_SignedData_verify]
= CMS_SignedData_verify
:mrdocs:

Verify a CMS SignedData structure and return a BIO of the signed content on success.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIO.adoc[BIO]*
CMS_SignedData_verify(
    xref:CMS_SignedData.adoc[CMS_SignedData]* sd,
    xref:BIO.adoc[BIO]* detached_data,
    xref:stack_st_X509.adoc[stack_st_X509]* scerts,
    xref:X509_STORE.adoc[X509_STORE]* store,
    xref:stack_st_X509.adoc[stack_st_X509]* extra,
    xref:stack_st_X509_CRL.adoc[stack_st_X509_CRL]* crls,
    unsigned int flags,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

Memory BIO containing the content on success, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *sd*
| SignedData to verify (not freed by this call).
| *detached_data*
| Detached content BIO, or NULL if content is encapsulated.
| *scerts*
| Optional stack of signer certificates, or NULL.
| *store*
| Trusted certificate store for chain verification, or NULL if not required by `flags.`
| *extra*
| Optional extra certificates to add for chain building, or NULL.
| *crls*
| Optional CRLs to add for verification, or NULL.
| *flags*
| CMS verify flags (same meaning as CMS_verify()).
| *libctx*
| Library context for algorithm fetches, or NULL for the default.
| *propq*
| Property query string, or NULL.
|===


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