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136 .IX Title "CMS_get0_SignerInfos 3"
137 .TH CMS_get0_SignerInfos 3 "2008-04-10" "1.1.0-dev" "OpenSSL"
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144 \& CMS_get0_SignerInfos, CMS_SignerInfo_get0_signer_id, CMS_SignerInfo_cert_cmp, CMS_set1_signer_certs \- CMS signedData signer functions.
149 .IX Header "SYNOPSIS"
151 \& #include <openssl/cms.h>
153 \& STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms);
155 \& int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING **keyid, X509_NAME **issuer, ASN1_INTEGER **sno);
156 \& int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert);
157 \& void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer);
160 .IX Header "DESCRIPTION"
161 The function \fICMS_get0_SignerInfos()\fR returns all the CMS_SignerInfo structures
162 associated with a \s-1CMS\s0 signedData structure.
164 \&\fICMS_SignerInfo_get0_signer_id()\fR retrieves the certificate signer identifier
165 associated with a specific CMS_SignerInfo structure \fBsi\fR. Either the
166 keyidentifier will be set in \fBkeyid\fR or \fBboth\fR issuer name and serial number
167 in \fBissuer\fR and \fBsno\fR.
169 \&\fICMS_SignerInfo_cert_cmp()\fR compares the certificate \fBcert\fR against the signer
170 identifier \fBsi\fR. It returns zero if the comparison is successful and non zero
173 \&\fICMS_SignerInfo_set1_signer_cert()\fR sets the signers certificate of \fBsi\fR to
177 The main purpose of these functions is to enable an application to lookup
178 signers certificates using any appropriate technique when the simpler method
179 of \fICMS_verify()\fR is not appropriate.
181 In typical usage and application will retrieve all CMS_SignerInfo structures
182 using \fICMS_get0_SignerInfo()\fR and retrieve the identifier information using
183 \&\s-1CMS\s0. It will then obtain the signer certificate by some unspecified means
184 (or return and error if it cannot be found) and set it using
185 \&\fICMS_SignerInfo_set1_signer_cert()\fR.
187 Once all signer certificates have been set \fICMS_verify()\fR can be used.
189 Although \fICMS_get0_SignerInfos()\fR can return \s-1NULL\s0 is an error occur \fBor\fR if
190 there are no signers this is not a problem in practice because the only
191 error which can occur is if the \fBcms\fR structure is not of type signedData
192 due to application error.
194 .IX Header "RETURN VALUES"
195 \&\fICMS_get0_SignerInfos()\fR returns all CMS_SignerInfo structures, or \s-1NULL\s0 there
196 are no signers or an error occurs.
198 \&\fICMS_SignerInfo_get0_signer_id()\fR returns 1 for success and 0 for failure.
200 \&\fICMS_SignerInfo_cert_cmp()\fR returns 0 for a successful comparison and non
203 \&\fICMS_SignerInfo_set1_signer_cert()\fR does not return a value.
205 Any error can be obtained from \fIERR_get_error\fR\|(3)
207 .IX Header "SEE ALSO"
208 \&\fIERR_get_error\fR\|(3), \fICMS_verify\fR\|(3)
211 These functions were first was added to OpenSSL 0.9.8