CMS_get0_SignerInfos(3) OpenSSL CMS_get0_SignerInfos(3)
NAME
CMS_get0_SignerInfos, CMS_SignerInfo_get0_signer_id,
CMS_SignerInfo_get0_signature, CMS_SignerInfo_cert_cmp,
CMS_set1_signer_cert - 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)
HISTORY
These functions were first was added to OpenSSL 0.9.8
1.0.2p 2018-08-14 CMS_get0_SignerInfos(3)
openssl 1.0.2p - Generated Fri Aug 17 09:06:54 CDT 2018