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CMS_add1_signer.3
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For example if multiple signers or non default digest algorithms are needed. New attributes can also be added using the returned CMS_SignerInfo structure and the \s-1CMS\s0 attribute utility functions or the \&\s-1CMS\s0 signed receipt request functions. .PP Any of the following flags (ored together) can be passed in the \fBflags\fR parameter. .PP If \fB\s-1CMS_REUSE_DIGEST\s0\fR is set then an attempt is made to copy the content digest value from the CMS_ContentInfo structure: to add a signer to an existing structure. An error occurs if a matching digest value cannot be found to copy. The returned CMS_ContentInfo structure will be valid and finalized when this flag is set. .PP If \fB\s-1CMS_PARTIAL\s0\fR is set in addition to \fB\s-1CMS_REUSE_DIGEST\s0\fR then the CMS_SignerInfo structure will not be finalized so additional attributes can be added. In this case an explicit call to \fICMS_SignerInfo_sign()\fR is needed to finalize it. .PP If \fB\s-1CMS_NOCERTS\s0\fR is set the signer's certificate will not be included in the CMS_ContentInfo structure, the signer's certificate must still be supplied in the \fBsigncert\fR parameter though. This can reduce the size of the signature if the signers certificate can be obtained by other means: for example a previously signed message. .PP The SignedData structure includes several \s-1CMS\s0 signedAttributes including the signing time, the \s-1CMS\s0 content type and the supported list of ciphers in an SMIMECapabilities attribute. If \fB\s-1CMS_NOATTR\s0\fR is set then no signedAttributes will be used. If \fB\s-1CMS_NOSMIMECAP\s0\fR is set then just the SMIMECapabilities are omitted. .PP OpenSSL will by default identify signing certificates using issuer name and serial number. If \fB\s-1CMS_USE_KEYID\s0\fR is set it will use the subject key identifier value instead. An error occurs if the signing certificate does not have a subject key identifier extension. .PP If present the SMIMECapabilities attribute indicates support for the following algorithms in preference order: 256 bit \s-1AES\s0, Gost R3411\-94, Gost 28147\-89, 192 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. 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 not loaded. .PP \&\fICMS_add1_signer()\fR returns an internal pointer to the CMS_SignerInfo structure just added, this can be used to set additional attributes before it is finalized. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fICMS_add1_signer()\fR returns an internal pointer to the CMS_SignerInfo structure just added or \s-1NULL\s0 if an error occurs. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3), \&\fICMS_final\fR\|(3), .SH "HISTORY" .IX Header "HISTORY" \&\fICMS_add1_signer()\fR was added to OpenSSL 0.9.8