[#PKCS7_signatureVerify]
= PKCS7_signatureVerify
:mrdocs:

Verify one PKCS#7 signer info's signature against content digested from `bio.`

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS7_signatureVerify(
    xref:BIO.adoc[BIO]* bio,
    xref:PKCS7.adoc[PKCS7]* p7,
    xref:PKCS7_SIGNER_INFO.adoc[PKCS7_SIGNER_INFO]* si,
    xref:X509.adoc[X509]* signer);
----

== Return Value

1 if the signature is valid, or 0 / a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO supplying the signed content octets (digest input).
| *p7*
| Signed PKCS#7 structure containing the signer infos / certificates.
| *si*
| Signer info whose signature is verified.
| *signer*
| Certificate whose public key verifies `si` (may be from `p7).`
|===


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