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SSL_GET_PEER_SIGNATURE_NID(3)       OpenSSL      SSL_GET_PEER_SIGNATURE_NID(3)
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 OpenSSL license (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>;.
1.1.1k                            2021-03-25     SSL_GET_PEER_SIGNATURE_NID(3)