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SSL_get_verify_resultget result of peer certificate verification

#include <openssl/ssl.h>

SSL_get_verify_result(const SSL *ssl);

() returns the result of the verification of the X509 certificate presented by the peer, if any.

() can only return one error code while the verification of a certificate can fail because of many reasons at the same time. Only the last verification error that occurred during the processing is available from SSL_get_verify_result().

The verification result is part of the established session and is restored when a session is reused.

The following return values can currently occur:

The verification succeeded or no peer certificate was presented.
Any other value
Documented in openssl(1).

openssl(1), ssl(3), SSL_CTX_set_verify(3), SSL_get0_peername(3), SSL_get_peer_certificate(3), SSL_set_verify_result(3)

SSL_get_verify_result() first appeared in SSLeay 0.6.1 and has been available since OpenBSD 2.4.

If no peer certificate was presented, the returned result code is X509_V_OK. This is because no verification error occurred; however, it does not indicate success. SSL_get_verify_result() is only useful in connection with SSL_get_peer_certificate(3).

June 26, 2021 OpenBSD-7.3