.\" $OpenBSD: X509_get0_signature.3,v 1.8 2023/03/16 12:01:47 job Exp $ .\" selective merge up to: .\" OpenSSL man3/X509_get0_signature 2f7a2520 Apr 25 17:28:08 2017 +0100 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2020 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: March 16 2023 $ .Dt X509_GET0_SIGNATURE 3 .Os .Sh NAME .Nm X509_get0_signature , .Nm X509_REQ_get0_signature , .Nm X509_CRL_get0_signature , .Nm X509_get0_tbs_sigalg , .Nm X509_CRL_get0_tbs_sigalg , .Nm X509_get_signature_type , .Nm X509_get_signature_nid , .Nm X509_REQ_get_signature_nid , .Nm X509_CRL_get_signature_nid .Nd signature information .Sh SYNOPSIS .In openssl/x509.h .Ft void .Fo X509_get0_signature .Fa "const ASN1_BIT_STRING **psig" .Fa "const X509_ALGOR **palg" .Fa "const X509 *x" .Fc .Ft void .Fo X509_REQ_get0_signature .Fa "const X509_REQ *req" .Fa "const ASN1_BIT_STRING **psig" .Fa "const X509_ALGOR **palg" .Fc .Ft void .Fo X509_CRL_get0_signature .Fa "const X509_CRL *crl" .Fa "const ASN1_BIT_STRING **psig" .Fa "const X509_ALGOR **palg" .Fc .Ft const X509_ALGOR * .Fo X509_get0_tbs_sigalg .Fa "const X509 *x" .Fc .Ft const X509_ALGOR * .Fo X509_CRL_get0_tbs_sigalg .Fa "const X509_CRL *crl" .Fc .Ft int .Fo X509_get_signature_type .Fa "const X509 *x" .Fc .Ft int .Fo X509_get_signature_nid .Fa "const X509 *x" .Fc .Ft int .Fo X509_REQ_get_signature_nid .Fa "const X509_REQ *req" .Fc .Ft int .Fo X509_CRL_get_signature_nid .Fa "const X509_CRL *crl" .Fc .Sh DESCRIPTION .Fn X509_get0_signature , .Fn X509_REQ_get0_signature , and .Fn X509_CRL_get0_signature set .Pf * Fa psig to the signature and .Pf * Fa palg to the signature algorithm of .Fa x , .Fa req , or .Fa crl , respectively. .Fn X509_get0_tbs_sigalg and .Fn X509_CRL_get0_tbs_sigalg return the signature algorithm in the signed portion of .Fa x or .Fa crl , respectively. The values returned are internal pointers that must not be freed by the caller. .Pp .Fn X509_get_signature_type returns the base NID corresponding to the signature algorithm of .Fa x just like .Xr EVP_PKEY_base_id 3 does. .Pp .Fn X509_get_signature_nid , .Fn X509_REQ_get_signature_nid , and .Fn X509_CRL_get_signature_nid return the NID corresponding to the signature algorithm of .Fa x , .Fa req , or .Fa crl , respectively, just like .Xr EVP_PKEY_id 3 does. .Pp These functions provide lower level access to the signature for cases where an application wishes to analyse or generate a signature in a form where .Xr X509_sign 3 is not appropriate, for example in a non-standard or unsupported format. .Sh SEE ALSO .Xr EVP_PKEY_base_id 3 , .Xr OBJ_obj2nid 3 , .Xr X509_ALGOR_new 3 , .Xr X509_CRL_get0_by_serial 3 , .Xr X509_CRL_new 3 , .Xr X509_get_pubkey 3 , .Xr X509_get_subject_name 3 , .Xr X509_get_version 3 , .Xr X509_new 3 , .Xr X509_REQ_new 3 , .Xr X509_sign 3 , .Xr X509_signature_dump 3 , .Xr X509_verify_cert 3 .Sh HISTORY .Fn X509_get_signature_type first appeared in SSLeay 0.8.0 and has been available since .Ox 2.4 . .Pp .Fn X509_get0_signature and .Fn X509_get_signature_nid first appeared in OpenSSL 1.0.2. .Fn X509_REQ_get0_signature , .Fn X509_CRL_get0_signature , .Fn X509_get0_tbs_sigalg , .Fn X509_REQ_get_signature_nid , and .Fn X509_CRL_get_signature_nid first appeared in OpenSSL 1.1.0. All these functions have been available since .Ox 6.3 . .Pp .Fn X509_CRL_get0_tbs_sigalg first appeared in LibreSSL 3.7.1 and has been available since .Ox 7.3 .