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.\" ========================================================================
.\"
.IX Title "X509_GET0_SIGNATURE 3SSL"
.TH X509_GET0_SIGNATURE 3SSL "2018-11-28" "1.1.0j" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIX509_get0_signature()\fR sets \fB*psig\fR to the signature of \fBx\fR and \fB*palg\fR
to the signature algorithm of \fBx\fR. The values returned are internal
pointers which \fB\s-1MUST NOT\s0\fR be freed up after the call.
.PP
\&\fIX509_get0_tbs_sigalg()\fR returns the signature algorithm in the signed
portion of \fBx\fR.
.PP
\&\fIX509_get_signature_nid()\fR returns the \s-1NID\s0 corresponding to the signature
algorithm of \fBx\fR.
.PP
\&\fIX509_REQ_get0_signature()\fR, \fIX509_REQ_get_signature_nid()\fR
\&\fIX509_CRL_get0_signature()\fR and \fIX509_CRL_get_signature_nid()\fR perform the
same function for certificate requests and CRLs.
.SH "NOTES"
.IX Header "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 \fIX509_sign()\fR et al is not appropriate (for example a non standard
or unsupported format).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIX509_get_signature_nid()\fR, \fIX509_REQ_get_signature_nid()\fR and
\&\fIX509_CRL_get_signature_nid()\fR return a \s-1NID.\s0
.PP
\&\fIX509_get0_signature()\fR, \fIX509_REQ_get0_signature()\fR and
\&\fIX509_CRL_get0_signature()\fR do not return values.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fId2i_X509\fR\|(3),
\&\fIERR_get_error\fR\|(3),
\&\fIX509_CRL_get0_by_serial\fR\|(3),
\&\fIX509_get_ext_d2i\fR\|(3),
\&\fIX509_get_extension_flags\fR\|(3),
\&\fIX509_get_pubkey\fR\|(3),
\&\fIX509_get_subject_name\fR\|(3),
\&\fIX509_get_version\fR\|(3),
\&\fIX509_NAME_add_entry_by_txt\fR\|(3),
\&\fIX509_NAME_ENTRY_get_object\fR\|(3),
\&\fIX509_NAME_get_index_by_NID\fR\|(3),
\&\fIX509_NAME_print_ex\fR\|(3),
\&\fIX509_new\fR\|(3),
\&\fIX509_sign\fR\|(3),
\&\fIX509V3_get_d2i\fR\|(3),
\&\fIX509_verify_cert\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fIX509_get0_signature()\fR and \fIX509_get_signature_nid()\fR were first added to
OpenSSL 1.0.2.
.PP
\&\fIX509_REQ_get0_signature()\fR, \fIX509_REQ_get_signature_nid()\fR,
\&\fIX509_CRL_get0_signature()\fR and \fIX509_CRL_get_signature_nid()\fR were first added
to OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.