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Diffstat (limited to 'secure/lib/libcrypto/man/CMS_add1_signer.3')
| -rw-r--r-- | secure/lib/libcrypto/man/CMS_add1_signer.3 | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/CMS_add1_signer.3 b/secure/lib/libcrypto/man/CMS_add1_signer.3 new file mode 100644 index 000000000000..71cb2695638d --- /dev/null +++ b/secure/lib/libcrypto/man/CMS_add1_signer.3 @@ -0,0 +1,233 @@ +.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +.Vb 1 +\& CMS_add1_signer, CMS_SignerInfo_sign \- add a signer to a CMS_ContentInfo signed data structure. +.Ve +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/cms.h> +\& +\& CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, unsigned int flags); +\& +\& int CMS_SignerInfo_sign(CMS_SignerInfo *si); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fICMS_add1_signer()\fR adds a signer with certificate \fBsigncert\fR and private +key \fBpkey\fR using message digest \fBmd\fR to CMS_ContentInfo SignedData +structure \fBcms\fR. +.PP +The CMS_ContentInfo structure should be obtained from an initial call to +\&\fICMS_sign()\fR with the flag \fB\s-1CMS_PARTIAL\s0\fR set or in the case or re-signing a +valid CMS_ContentInfo SignedData structure. +.PP +If the \fBmd\fR parameter is \fB\s-1NULL\s0\fR then the default digest for the public +key algorithm will be used. +.PP +Unless the \fB\s-1CMS_REUSE_DIGEST\s0\fR flag is set the returned CMS_ContentInfo +structure is not complete and must be finalized either by streaming (if +applicable) or a call to \fICMS_final()\fR. +.PP +The \fICMS_SignerInfo_sign()\fR function will explicitly sign a CMS_SignerInfo +structure, its main use is when \fB\s-1CMS_REUSE_DIGEST\s0\fR and \fB\s-1CMS_PARTIAL\s0\fR flags +are both set. +.SH "NOTES" +.IX Header "NOTES" +The main purpose of \fICMS_add1_signer()\fR is to provide finer control +over a \s-1CMS\s0 signed data structure where the simpler \fICMS_sign()\fR function defaults +are not appropriate. 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, 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 +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 +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 |