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135 .\" ========================================================================
137 .IX Title "CMS_add1_signer 3"
138 .TH CMS_add1_signer 3 "2015-01-13" "1.0.1n" "OpenSSL"
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145 \& CMS_add1_signer, CMS_SignerInfo_sign \- add a signer to a CMS_ContentInfo signed data structure.
150 .IX Header "SYNOPSIS"
152 \& #include <openssl/cms.h>
154 \& CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, unsigned int flags);
156 \& int CMS_SignerInfo_sign(CMS_SignerInfo *si);
159 .IX Header "DESCRIPTION"
160 \&\fICMS_add1_signer()\fR adds a signer with certificate \fBsigncert\fR and private
161 key \fBpkey\fR using message digest \fBmd\fR to CMS_ContentInfo SignedData
164 The CMS_ContentInfo structure should be obtained from an initial call to
165 \&\fICMS_sign()\fR with the flag \fB\s-1CMS_PARTIAL\s0\fR set or in the case or re-signing a
166 valid CMS_ContentInfo SignedData structure.
168 If the \fBmd\fR parameter is \fB\s-1NULL\s0\fR then the default digest for the public
169 key algorithm will be used.
171 Unless the \fB\s-1CMS_REUSE_DIGEST\s0\fR flag is set the returned CMS_ContentInfo
172 structure is not complete and must be finalized either by streaming (if
173 applicable) or a call to \fICMS_final()\fR.
175 The \fICMS_SignerInfo_sign()\fR function will explicitly sign a CMS_SignerInfo
176 structure, its main use is when \fB\s-1CMS_REUSE_DIGEST\s0\fR and \fB\s-1CMS_PARTIAL\s0\fR flags
180 The main purpose of \fICMS_add1_signer()\fR is to provide finer control
181 over a \s-1CMS\s0 signed data structure where the simpler \fICMS_sign()\fR function defaults
182 are not appropriate. For example if multiple signers or non default digest
183 algorithms are needed. New attributes can also be added using the returned
184 CMS_SignerInfo structure and the \s-1CMS\s0 attribute utility functions or the
185 \&\s-1CMS\s0 signed receipt request functions.
187 Any of the following flags (ored together) can be passed in the \fBflags\fR
190 If \fB\s-1CMS_REUSE_DIGEST\s0\fR is set then an attempt is made to copy the content
191 digest value from the CMS_ContentInfo structure: to add a signer to an existing
192 structure. An error occurs if a matching digest value cannot be found to copy.
193 The returned CMS_ContentInfo structure will be valid and finalized when this
196 If \fB\s-1CMS_PARTIAL\s0\fR is set in addition to \fB\s-1CMS_REUSE_DIGEST\s0\fR then the
197 CMS_SignerInfo structure will not be finalized so additional attributes
198 can be added. In this case an explicit call to \fICMS_SignerInfo_sign()\fR is
199 needed to finalize it.
201 If \fB\s-1CMS_NOCERTS\s0\fR is set the signer's certificate will not be included in the
202 CMS_ContentInfo structure, the signer's certificate must still be supplied in
203 the \fBsigncert\fR parameter though. This can reduce the size of the signature if
204 the signers certificate can be obtained by other means: for example a
205 previously signed message.
207 The SignedData structure includes several \s-1CMS\s0 signedAttributes including the
208 signing time, the \s-1CMS\s0 content type and the supported list of ciphers in an
209 SMIMECapabilities attribute. If \fB\s-1CMS_NOATTR\s0\fR is set then no signedAttributes
210 will be used. If \fB\s-1CMS_NOSMIMECAP\s0\fR is set then just the SMIMECapabilities are
213 OpenSSL will by default identify signing certificates using issuer name
214 and serial number. If \fB\s-1CMS_USE_KEYID\s0\fR is set it will use the subject key
215 identifier value instead. An error occurs if the signing certificate does not
216 have a subject key identifier extension.
218 If present the SMIMECapabilities attribute indicates support for the following
219 algorithms in preference order: 256 bit \s-1AES,\s0 Gost R3411\-94, Gost 28147\-89, 192
220 bit \s-1AES, 128\s0 bit \s-1AES,\s0 triple \s-1DES, 128\s0 bit \s-1RC2, 64\s0 bit \s-1RC2, DES\s0 and 40 bit \s-1RC2.\s0
221 If any of these algorithms is not available then it will not be included: for example the \s-1GOST\s0 algorithms will not be included if the \s-1GOST ENGINE\s0 is
224 \&\fICMS_add1_signer()\fR returns an internal pointer to the CMS_SignerInfo
225 structure just added, this can be used to set additional attributes
226 before it is finalized.
228 .IX Header "RETURN VALUES"
229 \&\fICMS_add1_signer()\fR returns an internal pointer to the CMS_SignerInfo
230 structure just added or \s-1NULL\s0 if an error occurs.
232 .IX Header "SEE ALSO"
233 \&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3),
234 \&\fICMS_final\fR\|(3),
237 \&\fICMS_add1_signer()\fR was added to OpenSSL 0.9.8