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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+. ds C` ""
+. ds C' ""
+'br\}
+.el\{\
+. ds C`
+. ds C'
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD. Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+. if \nF \{\
+. de IX
+. tm Index:\\$1\t\\n%\t"\\$2"
+..
+. if !\nF==2 \{\
+. nr % 0
+. nr F 2
+. \}
+. \}
+.\}
+.rr rF
+.\" ========================================================================
+.\"
+.IX Title "SSL_GET_PEER_SIGNATURE_NID 3ossl"
+.TH SSL_GET_PEER_SIGNATURE_NID 3ossl 2025-09-30 3.5.4 OpenSSL
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+SSL_get0_peer_signature_name, SSL_get_peer_signature_nid,
+SSL_get_peer_signature_type_nid, SSL_get0_signature_name,
+SSL_get_signature_nid, SSL_get_signature_type_nid \-
+get TLS message signing types
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\&
+\& int SSL_get0_peer_signature_name(const SSL *ssl, const char **sigalg);
+\& int SSL_get_peer_signature_nid(SSL *ssl, int *psig_nid);
+\& int SSL_get_peer_signature_type_nid(const SSL *ssl, int *psigtype_nid);
+\& int SSL_get0_signature_name(SSL *ssl, const char **sigalg);
+\& int SSL_get_signature_nid(SSL *ssl, int *psig_nid);
+\& int SSL_get_signature_type_nid(const SSL *ssl, int *psigtype_nid);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+\&\fBSSL_get0_peer_signature_name()\fR sets \fI*sigalg\fR to the IANA name of the
+signature scheme <https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-signaturescheme>
+used by the peer to sign the TLS handshake.
+The caller must not free the returned pointer.
+The returned string should be copied if it is to be retained beyond the
+lifetime of the SSL connection.
+.PP
+\&\fBSSL_get_peer_signature_nid()\fR sets \fB*psig_nid\fR to the NID of the digest used
+by the peer to sign TLS messages. It is implemented as a macro.
+.PP
+\&\fBSSL_get_peer_signature_type_nid()\fR sets \fB*psigtype_nid\fR to the signature
+type used by the peer to sign TLS messages. Currently the signature type
+is the NID of the public key type used for signing except for PSS signing
+where it is \fBEVP_PKEY_RSA_PSS\fR. To differentiate between
+\&\fBrsa_pss_rsae_*\fR and \fBrsa_pss_pss_*\fR signatures, it's necessary to check
+the type of public key in the peer's certificate.
+.PP
+\&\fBSSL_get0_signature_name()\fR, \fBSSL_get_signature_nid()\fR and
+\&\fBSSL_get_signature_type_nid()\fR return the equivalent information for the local
+end of the connection.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+These functions return 1 for success and 0 for failure. There are several
+possible reasons for failure: the peer or local end is a client and did not
+sign the handshake (did not use a client certificate), the cipher suite has no
+signature (e.g. it uses RSA key exchange or is anonymous), the TLS version is
+below 1.2 or the functions were called too early, e.g. before the peer signed a
+message.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBssl\fR\|(7), \fBSSL_get_peer_certificate\fR\|(3),
+.SH HISTORY
+.IX Header "HISTORY"
+The \fBSSL_get0_peer_signature_name()\fR and \fBSSL_get0_signature_name()\fR functions were
+added in OpenSSL 3.5.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2017\-2025 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (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
+<https://www.openssl.org/source/license.html>.