216 lines
7.4 KiB
Groff
216 lines
7.4 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "PKCS7_sign_add_signer 3"
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.TH PKCS7_sign_add_signer 3 "2015-06-12" "1.0.1o" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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PKCS7_sign_add_signer \- add a signer PKCS7 signed data structure.
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/pkcs7.h>
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\&
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\& PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, int flags);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIPKCS7_sign_add_signer()\fR adds a signer with certificate \fBsigncert\fR and private
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key \fBpkey\fR using message digest \fBmd\fR to a \s-1PKCS7\s0 signed data structure
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\&\fBp7\fR.
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.PP
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The \s-1PKCS7\s0 structure should be obtained from an initial call to \fIPKCS7_sign()\fR
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with the flag \fB\s-1PKCS7_PARTIAL\s0\fR set or in the case or re-signing a valid \s-1PKCS7\s0
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signed data structure.
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.PP
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If the \fBmd\fR parameter is \fB\s-1NULL\s0\fR then the default digest for the public
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key algorithm will be used.
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.PP
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Unless the \fB\s-1PKCS7_REUSE_DIGEST\s0\fR flag is set the returned \s-1PKCS7\s0 structure
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is not complete and must be finalized either by streaming (if applicable) or
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a call to \fIPKCS7_final()\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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The main purpose of this function is to provide finer control over a PKCS#7
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signed data structure where the simpler \fIPKCS7_sign()\fR function defaults are
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not appropriate. For example if multiple signers or non default digest
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algorithms are needed.
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.PP
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Any of the following flags (ored together) can be passed in the \fBflags\fR
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parameter.
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.PP
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If \fB\s-1PKCS7_REUSE_DIGEST\s0\fR is set then an attempt is made to copy the content
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digest value from the \s-1PKCS7\s0 struture: to add a signer to an existing structure.
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An error occurs if a matching digest value cannot be found to copy. The
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returned \s-1PKCS7\s0 structure will be valid and finalized when this flag is set.
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.PP
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If \fB\s-1PKCS7_PARTIAL\s0\fR is set in addition to \fB\s-1PKCS7_REUSE_DIGEST\s0\fR then the
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\&\fB\s-1PKCS7_SIGNER_INO\s0\fR structure will not be finalized so additional attributes
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can be added. In this case an explicit call to \fIPKCS7_SIGNER_INFO_sign()\fR is
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needed to finalize it.
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.PP
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If \fB\s-1PKCS7_NOCERTS\s0\fR is set the signer's certificate will not be included in the
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\&\s-1PKCS7\s0 structure, the signer's certificate must still be supplied in the
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\&\fBsigncert\fR parameter though. This can reduce the size of the signature if the
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signers certificate can be obtained by other means: for example a previously
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signed message.
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.PP
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The signedData structure includes several PKCS#7 autenticatedAttributes
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including the signing time, the PKCS#7 content type and the supported list of
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ciphers in an SMIMECapabilities attribute. If \fB\s-1PKCS7_NOATTR\s0\fR is set then no
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authenticatedAttributes will be used. If \fB\s-1PKCS7_NOSMIMECAP\s0\fR is set then just
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the SMIMECapabilities are omitted.
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.PP
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If present the SMIMECapabilities attribute indicates support for the following
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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
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these algorithms is disabled then it will not be included.
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.PP
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\&\fIPKCS7_sign_add_signers()\fR returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0
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structure just added, this can be used to set additional attributes
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before it is finalized.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIPKCS7_sign_add_signers()\fR returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0
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structure just added or \s-1NULL\s0 if an error occurs.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3), \fIPKCS7_sign\fR\|(3),
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\&\fIPKCS7_final\fR\|(3),
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIPPKCS7_sign_add_signer()\fR was added to OpenSSL 1.0.0
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