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

SYNOPSIS

        #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);

DESCRIPTION

       SSL_get_peer_signature_nid() sets *psig_nid to the NID of the digest used by the peer to sign TLS
       messages. It is implemented as a macro.

       SSL_get_peer_signature_type_nid() sets *psigtype_nid 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 EVP_PKEY_RSA_PSS. To differentiate between rsa_pss_rsae_* and rsa_pss_pss_*
       signatures, it's necessary to check the type of public key in the peer's certificate.

       SSL_get_signature_nid() and SSL_get_signature_type_nid() return the equivalent information for the local
       end of the connection.

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 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.

SEE ALSO

       ssl(7), SSL_get_peer_certificate(3),

COPYRIGHT

       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.

       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>.

3.0.13                                             2025-02-05                   SSL_GET_PEER_SIGNATURE_NID(3SSL)