CMS_GET0_SIGNERINFOS - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMECMS_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);
DESCRIPTIONThe 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.
NOTESThe 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)
COPYRIGHTCopyright 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>. 0
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