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PKCS7_sign_add_signer.pod
=pod =head1 NAME PKCS7_sign_add_signer, PKCS7_add_certificate, PKCS7_add_crl - add information to PKCS7 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); int PKCS7_add_certificate(PKCS7 *p7, X509 *cert); int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl); =head1 DESCRIPTION PKCS7_sign_add_signer() adds a signer with certificate I<signcert> and private key I<pkey> using message digest I<md> to a PKCS7 signed data structure I<p7>. The B<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 PKCS#7 signed data structure. If the I<md> parameter is NULL then the default digest for the public key algorithm will be used. Unless the B<PKCS7_REUSE_DIGEST> flag is set the returned B<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 I<flags> parameter. If B<PKCS7_REUSE_DIGEST> is set then an attempt is made to copy the content digest value from the B<PKCS7> structure: to add a signer to an existing structure. An error occurs if a matching digest value cannot be found to copy. The returned B<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 B<PKCS7> structure, the signer's certificate must still be supplied in the I<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 authenticatedAttributes 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 B<PKCS7_SIGNER_INFO> structure just added, which can be used to set additional attributes before it is finalized. PKCS7_add_certificate() adds to the B<PKCS7> structure I<p7> the certificate I<cert>, which may be an end-entity (signer) certificate or a CA certificate useful for chain building. This is done internally by L<PKCS7_sign_ex(3)> and similar signing functions. It may have to be used before calling L<PKCS7_verify(3)> in order to provide any missing certificate(s) needed for verification. PKCS7_add_crl() adds the CRL I<crl> to the B<PKCS7> structure I<p7>. This may be called to provide certificate status information to be included when signing or to use when verifying the B<PKCS7> structure. =head1 RETURN VALUES PKCS7_sign_add_signers() returns an internal pointer to the B<PKCS7_SIGNER_INFO> structure just added or NULL if an error occurs. PKCS7_add_certificate() and PKCS7_add_crl() return 1 on success, 0 on error. =head1 SEE ALSO L<ERR_get_error(3)>, L<PKCS7_sign_ex(3)>, L<PKCS7_final(3)>, L<PKCS7_verify(3)> =head1 HISTORY The PPKCS7_sign_add_signer() function was added in OpenSSL 1.0.0. =head1 COPYRIGHT Copyright 2007-2022 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L<https://www.openssl.org/source/license.html>. =cut