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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 - get TLS message signing types LIBRARY libcrypto, -lcrypto 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); 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. 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 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>. 1.1.1 2018-09-17 SSL_get_peer_signature_nid(3)