fc5ecaddd0
While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
97 lines
3.5 KiB
Text
97 lines
3.5 KiB
Text
=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,
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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 structure: 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 authenticatedAttributes
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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)>, L<PKCS7_sign(3)>,
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L<PKCS7_final(3)>,
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=head1 HISTORY
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The PPKCS7_sign_add_signer() function was added in OpenSSL 1.0.0.
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=head1 COPYRIGHT
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Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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