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✏️ Editing: SSL_get_peer_signature_nid.3

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.\" ========================================================================
.\"
.IX Title "SSL_GET_PEER_SIGNATURE_NID 3"
.TH SSL_GET_PEER_SIGNATURE_NID 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
SSL_get_peer_signature_nid, SSL_get_peer_signature_type_nid, 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_get_peer_signature_nid(SSL *ssl, int *psig_nid);
\& int SSL_get_peer_signature_type_nid(const SSL *ssl, int *psigtype_nid);
\& 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_get_peer_signature_nid()\fR sets \fB*psig_nid\fR to the \s-1NID\s0 of the digest used
by the peer to sign \s-1TLS\s0 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 \s-1TLS\s0 messages. Currently the signature type
is the \s-1NID\s0 of the public key type used for signing except for \s-1PSS\s0 signing
where it is \fB\s-1EVP_PKEY_RSA_PSS\s0\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_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 cipher suite has no signature (e.g. it
uses \s-1RSA\s0 key exchange or is anonymous), the \s-1TLS\s0 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 "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2018 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>.

MR SKB