mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-28 09:03:01 +00:00
88 lines
3.1 KiB
Plaintext
88 lines
3.1 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
PKCS7_sign_add_signer - add a signer PKCS7 signed data structure.
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/pkcs7.h>
|
|
|
|
PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, int flags);
|
|
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
PKCS7_sign_add_signer() adds a signer with certificate B<signcert> and private
|
|
key B<pkey> using message digest B<md> to a PKCS7 signed data structure
|
|
B<p7>.
|
|
|
|
The PKCS7 structure should be obtained from an initial call to PKCS7_sign()
|
|
with the flag B<PKCS7_PARTIAL> set or in the case or re-signing a valid PKCS7
|
|
signed data structure.
|
|
|
|
If the B<md> parameter is B<NULL> then the default digest for the public
|
|
key algorithm will be used.
|
|
|
|
Unless the B<PKCS7_REUSE_DIGEST> flag is set the returned PKCS7 structure
|
|
is not complete and must be finalized either by streaming (if applicable) or
|
|
a call to PKCS7_final().
|
|
|
|
|
|
=head1 NOTES
|
|
|
|
The main purpose of this function is to provide finer control over a PKCS#7
|
|
signed data structure where the simpler PKCS7_sign() function defaults are
|
|
not appropriate. For example if multiple signers or non default digest
|
|
algorithms are needed.
|
|
|
|
Any of the following flags (ored together) can be passed in the B<flags>
|
|
parameter.
|
|
|
|
If B<PKCS7_REUSE_DIGEST> is set then an attempt is made to copy the content
|
|
digest value from the PKCS7 struture: to add a signer to an existing structure.
|
|
An error occurs if a matching digest value cannot be found to copy. The
|
|
returned PKCS7 structure will be valid and finalized when this flag is set.
|
|
|
|
If B<PKCS7_PARTIAL> is set in addition to B<PKCS7_REUSE_DIGEST> then the
|
|
B<PKCS7_SIGNER_INO> structure will not be finalized so additional attributes
|
|
can be added. In this case an explicit call to PKCS7_SIGNER_INFO_sign() is
|
|
needed to finalize it.
|
|
|
|
If B<PKCS7_NOCERTS> is set the signer's certificate will not be included in the
|
|
PKCS7 structure, the signer's certificate must still be supplied in the
|
|
B<signcert> 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.
|
|
|
|
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 B<PKCS7_NOATTR> is set then no
|
|
authenticatedAttributes will be used. If B<PKCS7_NOSMIMECAP> is set then just
|
|
the SMIMECapabilities are omitted.
|
|
|
|
If present the SMIMECapabilities attribute indicates support for the following
|
|
algorithms: triple DES, 128 bit RC2, 64 bit RC2, DES and 40 bit RC2. If any of
|
|
these algorithms is disabled then it will not be included.
|
|
|
|
|
|
PKCS7_sign_add_signers() returns an internal pointer to the PKCS7_SIGNER_INFO
|
|
structure just added, this can be used to set additional attributes
|
|
before it is finalized.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
PKCS7_sign_add_signers() returns an internal pointer to the PKCS7_SIGNER_INFO
|
|
structure just added or NULL if an error occurs.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_sign(3)|PKCS7_sign(3)>,
|
|
L<PKCS7_final(3)|PKCS7_final(3)>,
|
|
|
|
=head1 HISTORY
|
|
|
|
PPKCS7_sign_add_signer() was added to OpenSSL 1.0.0
|
|
|
|
=cut
|