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=pod
=head1 NAME
X509_get0_signature, X509_get_signature_nid, X509_get0_tbs_sigalg,
X509_REQ_get0_signature, X509_REQ_get_signature_nid, X509_CRL_get0_signature,
X509_CRL_get_signature_nid - signature information
=head1 SYNOPSIS
#include <openssl/x509.h>
void X509_get0_signature(const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg,
const X509 *x);
int X509_get_signature_nid(const X509 *x);
const X509_ALGOR *X509_get0_tbs_sigalg(const X509 *x);
void X509_REQ_get0_signature(const X509_REQ *crl,
const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg);
int X509_REQ_get_signature_nid(const X509_REQ *crl);
void X509_CRL_get0_signature(const X509_CRL *crl,
const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg);
int X509_CRL_get_signature_nid(const X509_CRL *crl);
=head1 DESCRIPTION
X509_get0_signature() sets B<*psig> to the signature of B<x> and B<*palg>
to the signature algorithm of B<x>. The values returned are internal
pointers which B<MUST NOT> be freed up after the call.
X509_get0_tbs_sigalg() returns the signature algorithm in the signed
portion of B<x>.
X509_get_signature_nid() returns the NID corresponding to the signature
algorithm of B<x>.
X509_REQ_get0_signature(), X509_REQ_get_signature_nid()
X509_CRL_get0_signature() and X509_CRL_get_signature_nid() perform the
same function for certificate requests and CRLs.
=head1 NOTES
These functions provide lower level access to signatures in certificates
where an application wishes to analyse or generate a signature in a form
where X509_sign() et al is not appropriate (for example a non standard
or unsupported format).
=head1 RETURN VALUES
X509_get_signature_nid(), X509_REQ_get_signature_nid() and
X509_CRL_get_signature_nid() return a NID.
X509_get0_signature(), X509_REQ_get0_signature() and
X509_CRL_get0_signature() do not return values.
=head1 SEE ALSO
L<d2i_X509(3)>,
L<ERR_get_error(3)>,
L<X509_CRL_get0_by_serial(3)>,
L<X509_get_ext_d2i(3)>,
L<X509_get_extension_flags(3)>,
L<X509_get_pubkey(3)>,
L<X509_get_subject_name(3)>,
L<X509_get_version(3)>,
L<X509_NAME_add_entry_by_txt(3)>,
L<X509_NAME_ENTRY_get_object(3)>,
L<X509_NAME_get_index_by_NID(3)>,
L<X509_NAME_print_ex(3)>,
L<X509_new(3)>,
L<X509_sign(3)>,
L<X509V3_get_d2i(3)>,
L<X509_verify_cert(3)>
=head1 HISTORY
X509_get0_signature() and X509_get_signature_nid() were first added to
OpenSSL 1.0.2.
X509_REQ_get0_signature(), X509_REQ_get_signature_nid(),
X509_CRL_get0_signature() and X509_CRL_get_signature_nid() were first added
to OpenSSL 1.1.0.
=head1 COPYRIGHT
Copyright 2015-2016 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
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