1CMS_GET0_SIGNERINFOS(3)             OpenSSL            CMS_GET0_SIGNERINFOS(3)
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NAME

6       CMS_SignerInfo_set1_signer_cert, CMS_get0_SignerInfos,
7       CMS_SignerInfo_get0_signer_id, CMS_SignerInfo_get0_signature,
8       CMS_SignerInfo_cert_cmp - CMS signedData signer functions
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SYNOPSIS

11        #include <openssl/cms.h>
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13        STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms);
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15        int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING **keyid,
16                                          X509_NAME **issuer, ASN1_INTEGER **sno);
17        ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si);
18        int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert);
19        void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer);
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DESCRIPTION

22       The function CMS_get0_SignerInfos() returns all the CMS_SignerInfo
23       structures associated with a CMS signedData structure.
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25       CMS_SignerInfo_get0_signer_id() retrieves the certificate signer
26       identifier associated with a specific CMS_SignerInfo structure si.
27       Either the keyidentifier will be set in keyid or both issuer name and
28       serial number in issuer and sno.
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30       CMS_SignerInfo_get0_signature() retrieves the signature associated with
31       si in a pointer to an ASN1_OCTET_STRING structure. This pointer
32       returned corresponds to the internal signature value if si so it may be
33       read or modified.
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35       CMS_SignerInfo_cert_cmp() compares the certificate cert against the
36       signer identifier si. It returns zero if the comparison is successful
37       and non zero if not.
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39       CMS_SignerInfo_set1_signer_cert() sets the signers certificate of si to
40       signer.
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NOTES

43       The main purpose of these functions is to enable an application to
44       lookup signers certificates using any appropriate technique when the
45       simpler method of CMS_verify() is not appropriate.
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47       In typical usage and application will retrieve all CMS_SignerInfo
48       structures using CMS_get0_SignerInfo() and retrieve the identifier
49       information using CMS. It will then obtain the signer certificate by
50       some unspecified means (or return and error if it cannot be found) and
51       set it using CMS_SignerInfo_set1_signer_cert().
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53       Once all signer certificates have been set CMS_verify() can be used.
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55       Although CMS_get0_SignerInfos() can return NULL if an error occurs or
56       if there are no signers this is not a problem in practice because the
57       only error which can occur is if the cms structure is not of type
58       signedData due to application error.
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RETURN VALUES

61       CMS_get0_SignerInfos() returns all CMS_SignerInfo structures, or NULL
62       there are no signers or an error occurs.
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64       CMS_SignerInfo_get0_signer_id() returns 1 for success and 0 for
65       failure.
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67       CMS_SignerInfo_cert_cmp() returns 0 for a successful comparison and non
68       zero otherwise.
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70       CMS_SignerInfo_set1_signer_cert() does not return a value.
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72       Any error can be obtained from ERR_get_error(3)
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SEE ALSO

75       ERR_get_error(3), CMS_verify(3)
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78       Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved.
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80       Licensed under the OpenSSL license (the "License").  You may not use
81       this file except in compliance with the License.  You can obtain a copy
82       in the file LICENSE in the source distribution or at
83       <https://www.openssl.org/source/license.html>.
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871.1.1g                            2020-04-23           CMS_GET0_SIGNERINFOS(3)
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