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88 lines
3.1 KiB
Plaintext
88 lines
3.1 KiB
Plaintext
=pod
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=head1 NAME
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PKCS7_sign_add_signer - add a signer PKCS7 signed data structure.
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=head1 SYNOPSIS
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#include <openssl/pkcs7.h>
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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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=head1 DESCRIPTION
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PKCS7_sign_add_signer() adds a signer with certificate B<signcert> and private
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key B<pkey> using message digest B<md> to a PKCS7 signed data structure
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B<p7>.
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The PKCS7 structure should be obtained from an initial call to PKCS7_sign()
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with the flag B<PKCS7_PARTIAL> set or in the case or re-signing a valid PKCS7
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signed data structure.
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If the B<md> parameter is B<NULL> then the default digest for the public
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key algorithm will be used.
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Unless the B<PKCS7_REUSE_DIGEST> flag is set the returned PKCS7 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 PKCS7_final().
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=head1 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 PKCS7_sign() 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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Any of the following flags (ored together) can be passed in the B<flags>
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parameter.
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If B<PKCS7_REUSE_DIGEST> is set then an attempt is made to copy the content
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digest value from the PKCS7 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 PKCS7 structure will be valid and finalized when this flag is set.
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If B<PKCS7_PARTIAL> is set in addition to B<PKCS7_REUSE_DIGEST> then the
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B<PKCS7_SIGNER_INO> structure will not be finalized so additional attributes
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can be added. In this case an explicit call to PKCS7_SIGNER_INFO_sign() is
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needed to finalize it.
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If B<PKCS7_NOCERTS> is set the signer's certificate will not be included in the
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PKCS7 structure, the signer's certificate must still be supplied in the
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B<signcert> 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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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 B<PKCS7_NOATTR> is set then no
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authenticatedAttributes will be used. If B<PKCS7_NOSMIMECAP> is set then just
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the SMIMECapabilities are omitted.
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If present the SMIMECapabilities attribute indicates support for the following
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algorithms: triple DES, 128 bit RC2, 64 bit RC2, DES and 40 bit RC2. If any of
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these algorithms is disabled then it will not be included.
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PKCS7_sign_add_signers() returns an internal pointer to the PKCS7_SIGNER_INFO
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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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=head1 RETURN VALUES
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PKCS7_sign_add_signers() returns an internal pointer to the PKCS7_SIGNER_INFO
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structure just added or NULL if an error occurs.
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=head1 SEE ALSO
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L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_sign(3)|PKCS7_sign(3)>,
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L<PKCS7_final(3)|PKCS7_final(3)>,
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=head1 HISTORY
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PPKCS7_sign_add_signer() was added to OpenSSL 1.0.0
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=cut
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