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CMS_GET0_SIGNERINFOS(3)		    OpenSSL	       CMS_GET0_SIGNERINFOS(3)

NAME
       CMS_SignerInfo_set1_signer_cert,	CMS_get0_SignerInfos,
       CMS_SignerInfo_get0_signer_id, CMS_SignerInfo_get0_signature,
       CMS_SignerInfo_cert_cmp - CMS signedData	signer functions

SYNOPSIS
	#include <openssl/cms.h>

	STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms);

	int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING	**keyid,
					  X509_NAME **issuer, ASN1_INTEGER **sno);
	ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo	*si);
	int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si,	X509 *cert);
	void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer);

DESCRIPTION
       The function CMS_get0_SignerInfos() returns all the CMS_SignerInfo
       structures associated with a CMS	signedData structure.

       CMS_SignerInfo_get0_signer_id() retrieves the certificate signer
       identifier associated with a specific CMS_SignerInfo structure si.
       Either the keyidentifier	will be	set in keyid or	both issuer name and
       serial number in	issuer and sno.

       CMS_SignerInfo_get0_signature() retrieves the signature associated with
       si in a pointer to an ASN1_OCTET_STRING structure. This pointer
       returned	corresponds to the internal signature value if si so it	may be
       read or modified.

       CMS_SignerInfo_cert_cmp() compares the certificate cert against the
       signer identifier si. It	returns	zero if	the comparison is successful
       and non zero if not.

       CMS_SignerInfo_set1_signer_cert() sets the signers certificate of si to
       signer.

NOTES
       The main	purpose	of these functions is to enable	an application to
       lookup signers certificates using any appropriate technique when	the
       simpler method of CMS_verify() is not appropriate.

       In typical usage	and application	will retrieve all CMS_SignerInfo
       structures using	CMS_get0_SignerInfo() and retrieve the identifier
       information using CMS. It will then obtain the signer certificate by
       some unspecified	means (or return and error if it cannot	be found) and
       set it using CMS_SignerInfo_set1_signer_cert().

       Once all	signer certificates have been set CMS_verify() can be used.

       Although	CMS_get0_SignerInfos() can return NULL if an error occurs or
       if there	are no signers this is not a problem in	practice because the
       only error which	can occur is if	the cms	structure is not of type
       signedData due to application error.

RETURN VALUES
       CMS_get0_SignerInfos() returns all CMS_SignerInfo structures, or	NULL
       there are no signers or an error	occurs.

       CMS_SignerInfo_get0_signer_id() returns 1 for success and 0 for
       failure.

       CMS_SignerInfo_cert_cmp() returns 0 for a successful comparison and non
       zero otherwise.

       CMS_SignerInfo_set1_signer_cert() does not return a value.

       Any error can be	obtained from ERR_get_error(3)

SEE ALSO
       ERR_get_error(3), CMS_verify(3)

COPYRIGHT
       Copyright 2008-2018 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

1.1.1a				  2018-11-20	       CMS_GET0_SIGNERINFOS(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | SEE ALSO | COPYRIGHT

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