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| 124 | .\" ======================================================================== |
| 125 | .\" |
| 126 | .IX Title "CMS_sign_add1_signer 3" |
| 127 | .TH CMS_sign_add1_signer 3 "2012-01-04" "1.0.0f" "OpenSSL" |
| 128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 129 | .\" way too many mistakes in technical documents. |
| 130 | .if n .ad l |
| 131 | .nh |
| 132 | .SH "NAME" |
| 133 | .Vb 1 |
| 134 | \& CMS_sign_add1_signer, CMS_SignerInfo_sign \- add a signer to a CMS_ContentInfo signed data structure. |
| 135 | .Ve |
| 136 | .SH "SYNOPSIS" |
| 137 | .IX Header "SYNOPSIS" |
| 138 | .Vb 1 |
| 139 | \& #include <openssl/cms.h> |
| 140 | \& |
| 141 | \& CMS_SignerInfo *CMS_sign_add1_signer(CMS_ContentInfo *cms, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, unsigned int flags); |
| 142 | \& |
| 143 | \& int CMS_SignerInfo_sign(CMS_SignerInfo *si); |
| 144 | .Ve |
| 145 | .SH "DESCRIPTION" |
| 146 | .IX Header "DESCRIPTION" |
| 147 | \&\fICMS_sign_add1_signer()\fR adds a signer with certificate \fBsigncert\fR and private |
| 148 | key \fBpkey\fR using message digest \fBmd\fR to CMS_ContentInfo SignedData |
| 149 | structure \fBcms\fR. |
| 150 | .PP |
| 151 | The CMS_ContentInfo structure should be obtained from an initial call to |
| 152 | \&\fICMS_sign()\fR with the flag \fB\s-1CMS_PARTIAL\s0\fR set or in the case or re-signing a |
| 153 | valid CMS_ContentInfo SignedData structure. |
| 154 | .PP |
| 155 | If the \fBmd\fR parameter is \fB\s-1NULL\s0\fR then the default digest for the public |
| 156 | key algorithm will be used. |
| 157 | .PP |
| 158 | Unless the \fB\s-1CMS_REUSE_DIGEST\s0\fR flag is set the returned CMS_ContentInfo |
| 159 | structure is not complete and must be finalized either by streaming (if |
| 160 | applicable) or a call to \fICMS_final()\fR. |
| 161 | .PP |
| 162 | The \fICMS_SignerInfo_sign()\fR function will explicitly sign a CMS_SignerInfo |
| 163 | structure, its main use is when \fB\s-1CMS_REUSE_DIGEST\s0\fR and \fB\s-1CMS_PARTIAL\s0\fR flags |
| 164 | are both set. |
| 165 | .SH "NOTES" |
| 166 | .IX Header "NOTES" |
| 167 | The main purpose of \fICMS_sign_add1_signer()\fR is to provide finer control |
| 168 | over a \s-1CMS\s0 signed data structure where the simpler \fICMS_sign()\fR function defaults |
| 169 | are not appropriate. For example if multiple signers or non default digest |
| 170 | algorithms are needed. New attributes can also be added using the returned |
| 171 | CMS_SignerInfo structure and the \s-1CMS\s0 attribute utility functions or the |
| 172 | \&\s-1CMS\s0 signed receipt request functions. |
| 173 | .PP |
| 174 | Any of the following flags (ored together) can be passed in the \fBflags\fR |
| 175 | parameter. |
| 176 | .PP |
| 177 | If \fB\s-1CMS_REUSE_DIGEST\s0\fR is set then an attempt is made to copy the content |
| 178 | digest value from the CMS_ContentInfo structure: to add a signer to an existing |
| 179 | structure. An error occurs if a matching digest value cannot be found to copy. |
| 180 | The returned CMS_ContentInfo structure will be valid and finalized when this |
| 181 | flag is set. |
| 182 | .PP |
| 183 | If \fB\s-1CMS_PARTIAL\s0\fR is set in addition to \fB\s-1CMS_REUSE_DIGEST\s0\fR then the |
| 184 | CMS_SignerInfo structure will not be finalized so additional attributes |
| 185 | can be added. In this case an explicit call to \fICMS_SignerInfo_sign()\fR is |
| 186 | needed to finalize it. |
| 187 | .PP |
| 188 | If \fB\s-1CMS_NOCERTS\s0\fR is set the signer's certificate will not be included in the |
| 189 | CMS_ContentInfo structure, the signer's certificate must still be supplied in |
| 190 | the \fBsigncert\fR parameter though. This can reduce the size of the signature if |
| 191 | the signers certificate can be obtained by other means: for example a |
| 192 | previously signed message. |
| 193 | .PP |
| 194 | The SignedData structure includes several \s-1CMS\s0 signedAttributes including the |
| 195 | signing time, the \s-1CMS\s0 content type and the supported list of ciphers in an |
| 196 | SMIMECapabilities attribute. If \fB\s-1CMS_NOATTR\s0\fR is set then no signedAttributes |
| 197 | will be used. If \fB\s-1CMS_NOSMIMECAP\s0\fR is set then just the SMIMECapabilities are |
| 198 | omitted. |
| 199 | .PP |
| 200 | OpenSSL will by default identify signing certificates using issuer name |
| 201 | and serial number. If \fB\s-1CMS_USE_KEYID\s0\fR is set it will use the subject key |
| 202 | identifier value instead. An error occurs if the signing certificate does not |
| 203 | have a subject key identifier extension. |
| 204 | .PP |
| 205 | If present the SMIMECapabilities attribute indicates support for the following |
| 206 | algorithms in preference order: 256 bit \s-1AES\s0, Gost R3411\-94, Gost 28147\-89, 192 |
| 207 | bit \s-1AES\s0, 128 bit \s-1AES\s0, triple \s-1DES\s0, 128 bit \s-1RC2\s0, 64 bit \s-1RC2\s0, \s-1DES\s0 and 40 bit \s-1RC2\s0. |
| 208 | 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\s0 \s-1ENGINE\s0 is |
| 209 | not loaded. |
| 210 | .PP |
| 211 | \&\fICMS_sign_add1_signer()\fR returns an internal pointer to the CMS_SignerInfo |
| 212 | structure just added, this can be used to set additional attributes |
| 213 | before it is finalized. |
| 214 | .SH "RETURN VALUES" |
| 215 | .IX Header "RETURN VALUES" |
| 216 | \&\fICMS_sign1_add_signers()\fR returns an internal pointer to the CMS_SignerInfo |
| 217 | structure just added or \s-1NULL\s0 if an error occurs. |
| 218 | .SH "SEE ALSO" |
| 219 | .IX Header "SEE ALSO" |
| 220 | \&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3), |
| 221 | \&\fICMS_final\fR\|(3), |
| 222 | .SH "HISTORY" |
| 223 | .IX Header "HISTORY" |
| 224 | \&\fICMS_sign_add1_signer()\fR was added to OpenSSL 0.9.8 |