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Edit File : CMS_add1_signer.3 \| Size : 8.28 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" 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" \&\fBCMS_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 \&\fBCMS_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 \fBCMS_final()\fR. .PP The \fBCMS_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 \fBCMS_add1_signer()\fR is to provide finer control over a \s-1CMS\s0 signed data structure where the simpler \fBCMS_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 \fBCMS_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 \&\fBCMS_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" \&\fBCMS_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" \&\fBERR_get_error\fR\\|(3), \fBCMS_sign\fR\\|(3), \&\fBCMS_final\fR\\|(3), .SH "HISTORY" .IX Header "HISTORY" \&\fBCMS_add1_signer()\fR was added to OpenSSL 0.9.8 Back

Edit File : CMS_add1_signer.3 | Size : 8.28 KB

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.\" ========================================================================
.\"
.IX Title "CMS_add1_signer 3"
.TH CMS_add1_signer 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  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"
\&\fBCMS_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
\&\fBCMS_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 \fBCMS_final()\fR.
.PP
The \fBCMS_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 \fBCMS_add1_signer()\fR is to provide finer control
over a \s-1CMS\s0 signed data structure where the simpler \fBCMS_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 \fBCMS_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
\&\fBCMS_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"
\&\fBCMS_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"
\&\fBERR_get_error\fR\|(3), \fBCMS_sign\fR\|(3),
\&\fBCMS_final\fR\|(3),
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBCMS_add1_signer()\fR was added to OpenSSL 0.9.8

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