1.\" $OpenBSD: X509_get0_signature.3,v 1.5 2018/03/23 23:18:17 schwarze Exp $ 2.\" selective merge up to: 3.\" OpenSSL man3/X509_get0_signature 2f7a2520 Apr 25 17:28:08 2017 +0100 4.\" 5.\" This file was written by Dr. Stephen Henson <steve@openssl.org>. 6.\" Copyright (c) 2015 The OpenSSL Project. All rights reserved. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in 17.\" the documentation and/or other materials provided with the 18.\" distribution. 19.\" 20.\" 3. All advertising materials mentioning features or use of this 21.\" software must display the following acknowledgment: 22.\" "This product includes software developed by the OpenSSL Project 23.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24.\" 25.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26.\" endorse or promote products derived from this software without 27.\" prior written permission. For written permission, please contact 28.\" openssl-core@openssl.org. 29.\" 30.\" 5. Products derived from this software may not be called "OpenSSL" 31.\" nor may "OpenSSL" appear in their names without prior written 32.\" permission of the OpenSSL Project. 33.\" 34.\" 6. Redistributions of any form whatsoever must retain the following 35.\" acknowledgment: 36.\" "This product includes software developed by the OpenSSL Project 37.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38.\" 39.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50.\" OF THE POSSIBILITY OF SUCH DAMAGE. 51.\" 52.Dd $Mdocdate: March 23 2018 $ 53.Dt X509_GET0_SIGNATURE 3 54.Os 55.Sh NAME 56.Nm X509_get0_signature , 57.Nm X509_REQ_get0_signature , 58.Nm X509_CRL_get0_signature , 59.Nm X509_get0_tbs_sigalg , 60.Nm X509_get_signature_nid , 61.Nm X509_REQ_get_signature_nid , 62.Nm X509_CRL_get_signature_nid 63.Nd signature information 64.Sh SYNOPSIS 65.In openssl/x509.h 66.Ft void 67.Fo X509_get0_signature 68.Fa "const ASN1_BIT_STRING **psig" 69.Fa "const X509_ALGOR **palg" 70.Fa "const X509 *x" 71.Fc 72.Ft void 73.Fo X509_REQ_get0_signature 74.Fa "const X509_REQ *req" 75.Fa "const ASN1_BIT_STRING **psig" 76.Fa "const X509_ALGOR **palg" 77.Fc 78.Ft void 79.Fo X509_CRL_get0_signature 80.Fa "const X509_CRL *crl" 81.Fa "const ASN1_BIT_STRING **psig" 82.Fa "const X509_ALGOR **palg" 83.Fc 84.Ft const X509_ALGOR * 85.Fo X509_get0_tbs_sigalg 86.Fa "const X509 *x" 87.Fc 88.Ft int 89.Fo X509_get_signature_nid 90.Fa "const X509 *x" 91.Fc 92.Ft int 93.Fo X509_REQ_get_signature_nid 94.Fa "const X509_REQ *req" 95.Fc 96.Ft int 97.Fo X509_CRL_get_signature_nid 98.Fa "const X509_CRL *crl" 99.Fc 100.Sh DESCRIPTION 101.Fn X509_get0_signature , 102.Fn X509_REQ_get0_signature , 103and 104.Fn X509_CRL_get0_signature 105set 106.Pf * Fa psig 107to the signature and 108.Pf * Fa palg 109to the signature algorithm of 110.Fa x , 111.Fa req , 112or 113.Fa crl , 114respectively. 115.Fn X509_get0_tbs_sigalg 116returns the signature algorithm in the signed portion of 117.Fa x . 118The values returned are internal pointers 119that must not be freed by the caller. 120.Pp 121.Fn X509_get_signature_nid , 122.Fn X509_REQ_get_signature_nid , 123and 124.Fn X509_CRL_get_signature_nid 125return the NID corresponding to the signature algorithm of 126.Fa x , 127.Fa req , 128or 129.Fa crl , 130respectively. 131.Pp 132These functions provide lower level access to the signature 133for cases where an application wishes to analyse or generate a 134signature in a form where 135.Xr X509_sign 3 136is not appropriate, for example in a non-standard or unsupported format. 137.Sh SEE ALSO 138.Xr OBJ_obj2nid 3 , 139.Xr X509_ALGOR_new 3 , 140.Xr X509_CRL_get0_by_serial 3 , 141.Xr X509_CRL_new 3 , 142.Xr X509_get_pubkey 3 , 143.Xr X509_get_subject_name 3 , 144.Xr X509_get_version 3 , 145.Xr X509_new 3 , 146.Xr X509_REQ_new 3 , 147.Xr X509_sign 3 , 148.Xr X509_verify_cert 3 149.Sh HISTORY 150.Fn X509_get0_signature 151and 152.Fn X509_get_signature_nid 153first appeared in OpenSSL 1.0.2. 154.Fn X509_REQ_get0_signature , 155.Fn X509_CRL_get0_signature , 156.Fn X509_get0_tbs_sigalg , 157.Fn X509_REQ_get_signature_nid , 158and 159.Fn X509_CRL_get_signature_nid 160first appeared in OpenSSL 1.1.0. 161All these functions have been available since 162.Ox 6.3 . 163