+++ /dev/null
-=pod
-
-=head1 NAME
-
-PKCS7_verify, PKCS7_get0_signers - verify a PKCS#7 signedData structure
-
-=head1 SYNOPSIS
-
- #include <openssl/pkcs7.h>
-
- int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, BIO *indata, BIO *out, int flags);
-
- STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags);
-
-=head1 DESCRIPTION
-
-PKCS7_verify() verifies a PKCS#7 signedData structure. B<p7> is the PKCS7
-structure to verify. B<certs> is a set of certificates in which to search for
-the signer's certificate. B<store> is a trusted certificate store (used for
-chain verification). B<indata> is the signed data if the content is not
-present in B<p7> (that is it is detached). The content is written to B<out>
-if it is not NULL.
-
-B<flags> is an optional set of flags, which can be used to modify the verify
-operation.
-
-PKCS7_get0_signers() retrieves the signer's certificates from B<p7>, it does
-B<not> check their validity or whether any signatures are valid. The B<certs>
-and B<flags> parameters have the same meanings as in PKCS7_verify().
-
-=head1 VERIFY PROCESS
-
-Normally the verify process proceeds as follows.
-
-Initially some sanity checks are performed on B<p7>. The type of B<p7> must
-be signedData. There must be at least one signature on the data and if
-the content is detached B<indata> cannot be B<NULL>. If the content is
-not detached and B<indata> is not B<NULL>, then the structure has both
-embedded and external content. To treat this as an error, use the flag
-B<PKCS7_NO_DUAL_CONTENT>.
-The default behavior allows this, for compatibility with older
-versions of OpenSSL.
-
-An attempt is made to locate all the signer's certificates, first looking in
-the B<certs> parameter (if it is not B<NULL>) and then looking in any certificates
-contained in the B<p7> structure itself. If any signer's certificates cannot be
-located the operation fails.
-
-Each signer's certificate is chain verified using the B<smimesign> purpose and
-the supplied trusted certificate store. Any internal certificates in the message
-are used as untrusted CAs. If any chain verify fails an error code is returned.
-
-Finally the signed content is read (and written to B<out> is it is not NULL) and
-the signature's checked.
-
-If all signature's verify correctly then the function is successful.
-
-Any of the following flags (ored together) can be passed in the B<flags> parameter
-to change the default verify behaviour. Only the flag B<PKCS7_NOINTERN> is
-meaningful to PKCS7_get0_signers().
-
-If B<PKCS7_NOINTERN> is set the certificates in the message itself are not
-searched when locating the signer's certificate. This means that all the signers
-certificates must be in the B<certs> parameter.
-
-If the B<PKCS7_TEXT> flag is set MIME headers for type B<text/plain> are deleted
-from the content. If the content is not of type B<text/plain> then an error is
-returned.
-
-If B<PKCS7_NOVERIFY> is set the signer's certificates are not chain verified.
-
-If B<PKCS7_NOCHAIN> is set then the certificates contained in the message are
-not used as untrusted CAs. This means that the whole verify chain (apart from
-the signer's certificate) must be contained in the trusted store.
-
-If B<PKCS7_NOSIGS> is set then the signatures on the data are not checked.
-
-=head1 NOTES
-
-One application of B<PKCS7_NOINTERN> is to only accept messages signed by
-a small number of certificates. The acceptable certificates would be passed
-in the B<certs> parameter. In this case if the signer is not one of the
-certificates supplied in B<certs> then the verify will fail because the
-signer cannot be found.
-
-Care should be taken when modifying the default verify behaviour, for example
-setting B<PKCS7_NOVERIFY|PKCS7_NOSIGS> will totally disable all verification
-and any signed message will be considered valid. This combination is however
-useful if one merely wishes to write the content to B<out> and its validity
-is not considered important.
-
-Chain verification should arguably be performed using the signing time rather
-than the current time. However since the signing time is supplied by the
-signer it cannot be trusted without additional evidence (such as a trusted
-timestamp).
-
-=head1 RETURN VALUES
-
-PKCS7_verify() returns one for a successful verification and zero
-if an error occurs.
-
-PKCS7_get0_signers() returns all signers or B<NULL> if an error occurred.
-
-The error can be obtained from L<ERR_get_error(3)>
-
-=head1 BUGS
-
-The trusted certificate store is not searched for the signers certificate,
-this is primarily due to the inadequacies of the current B<X509_STORE>
-functionality.
-
-The lack of single pass processing and need to hold all data in memory as
-mentioned in PKCS7_sign() also applies to PKCS7_verify().
-
-=head1 SEE ALSO
-
-L<ERR_get_error(3)>, L<PKCS7_sign(3)>
-
-=head1 COPYRIGHT
-
-Copyright 2002-2016 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
projects / openssl.git / blobdiff