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Edit File : PKCS7_sign_add_signer.3 \| Size : 7.41 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" PKCS7_sign_add_signer \- add a signer PKCS7 signed data structure. .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/pkcs7.h> \& \& PKCS7_SIGNER_INFO PKCS7_sign_add_signer(PKCS7 p7, X509 signcert, EVP_PKEY pkey, const EVP_MD md, int flags); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBPKCS7_sign_add_signer()\fR adds a signer with certificate \fBsigncert\fR and private key \fBpkey\fR using message digest \fBmd\fR to a \s-1PKCS7\s0 signed data structure \&\fBp7\fR. .PP The \s-1PKCS7\s0 structure should be obtained from an initial call to \fBPKCS7_sign()\fR with the flag \fB\s-1PKCS7_PARTIAL\s0\fR set or in the case or re-signing a valid \s-1PKCS7\s0 signed data 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-1PKCS7_REUSE_DIGEST\s0\fR flag is set the returned \s-1PKCS7\s0 structure is not complete and must be finalized either by streaming (if applicable) or a call to \fBPKCS7_final()\fR. .SH "NOTES" .IX Header "NOTES" The main purpose of this function is to provide finer control over a PKCS#7 signed data structure where the simpler \fBPKCS7_sign()\fR function defaults are not appropriate. For example if multiple signers or non default digest algorithms are needed. .PP Any of the following flags (ored together) can be passed in the \fBflags\fR parameter. .PP If \fB\s-1PKCS7_REUSE_DIGEST\s0\fR is set then an attempt is made to copy the content digest value from the \s-1PKCS7\s0 struture: to add a signer to an existing structure. An error occurs if a matching digest value cannot be found to copy. The returned \s-1PKCS7\s0 structure will be valid and finalized when this flag is set. .PP If \fB\s-1PKCS7_PARTIAL\s0\fR is set in addition to \fB\s-1PKCS7_REUSE_DIGEST\s0\fR then the \&\fB\s-1PKCS7_SIGNER_INO\s0\fR structure will not be finalized so additional attributes can be added. In this case an explicit call to \fBPKCS7_SIGNER_INFO_sign()\fR is needed to finalize it. .PP If \fB\s-1PKCS7_NOCERTS\s0\fR is set the signer's certificate will not be included in the \&\s-1PKCS7\s0 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 PKCS#7 autenticatedAttributes including the signing time, the PKCS#7 content type and the supported list of ciphers in an SMIMECapabilities attribute. If \fB\s-1PKCS7_NOATTR\s0\fR is set then no authenticatedAttributes will be used. If \fB\s-1PKCS7_NOSMIMECAP\s0\fR is set then just the SMIMECapabilities are omitted. .PP If present the SMIMECapabilities attribute indicates support for the following algorithms: 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 disabled then it will not be included. .PP \&\fBPKCS7_sign_add_signers()\fR returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0 structure just added, this can be used to set additional attributes before it is finalized. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBPKCS7_sign_add_signers()\fR returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0 structure just added or \s-1NULL\s0 if an error occurs. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\\|(3), \fBPKCS7_sign\fR\\|(3), \&\fBPKCS7_final\fR\\|(3), .SH "HISTORY" .IX Header "HISTORY" \&\fBPPKCS7_sign_add_signer()\fR was added to OpenSSL 1.0.0 Back

Edit File : PKCS7_sign_add_signer.3 | Size : 7.41 KB

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.\" ========================================================================
.\"
.IX Title "PKCS7_sign_add_signer 3"
.TH PKCS7_sign_add_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"
PKCS7_sign_add_signer \- add a signer PKCS7 signed data structure.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/pkcs7.h>
\&
\& PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, int flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBPKCS7_sign_add_signer()\fR adds a signer with certificate \fBsigncert\fR and private
key \fBpkey\fR using message digest \fBmd\fR to a \s-1PKCS7\s0 signed data structure
\&\fBp7\fR.
.PP
The \s-1PKCS7\s0 structure should be obtained from an initial call to \fBPKCS7_sign()\fR
with the flag \fB\s-1PKCS7_PARTIAL\s0\fR set or in the case or re-signing a valid \s-1PKCS7\s0
signed data 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-1PKCS7_REUSE_DIGEST\s0\fR flag is set the returned \s-1PKCS7\s0 structure
is not complete and must be finalized either by streaming (if applicable) or
a call to \fBPKCS7_final()\fR.
.SH "NOTES"
.IX Header "NOTES"
The main purpose of this function is to provide finer control over a PKCS#7
signed data structure where the simpler \fBPKCS7_sign()\fR function defaults are
not appropriate. For example if multiple signers or non default digest
algorithms are needed.
.PP
Any of the following flags (ored together) can be passed in the \fBflags\fR
parameter.
.PP
If \fB\s-1PKCS7_REUSE_DIGEST\s0\fR is set then an attempt is made to copy the content
digest value from the \s-1PKCS7\s0 struture: to add a signer to an existing structure.
An error occurs if a matching digest value cannot be found to copy. The
returned \s-1PKCS7\s0 structure will be valid and finalized when this flag is set.
.PP
If \fB\s-1PKCS7_PARTIAL\s0\fR is set in addition to \fB\s-1PKCS7_REUSE_DIGEST\s0\fR then the 
\&\fB\s-1PKCS7_SIGNER_INO\s0\fR structure will not be finalized so additional attributes
can be added. In this case an explicit call to \fBPKCS7_SIGNER_INFO_sign()\fR is
needed to finalize it.
.PP
If \fB\s-1PKCS7_NOCERTS\s0\fR is set the signer's certificate will not be included in the
\&\s-1PKCS7\s0 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 PKCS#7 autenticatedAttributes
including the signing time, the PKCS#7 content type and the supported list of
ciphers in an SMIMECapabilities attribute. If \fB\s-1PKCS7_NOATTR\s0\fR is set then no
authenticatedAttributes will be used. If \fB\s-1PKCS7_NOSMIMECAP\s0\fR is set then just
the SMIMECapabilities are omitted.
.PP
If present the SMIMECapabilities attribute indicates support for the following
algorithms: 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 disabled then it will not be included.
.PP
\&\fBPKCS7_sign_add_signers()\fR returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0
structure just added, this can be used to set additional attributes 
before it is finalized.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBPKCS7_sign_add_signers()\fR returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0
structure just added or \s-1NULL\s0 if an error occurs.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBPKCS7_sign\fR\|(3),
\&\fBPKCS7_final\fR\|(3),
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBPPKCS7_sign_add_signer()\fR was added to OpenSSL 1.0.0

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