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=pod =head1 NAME SSL_do_handshake - perform a TLS/SSL handshake =head1 SYNOPSIS #include int SSL_do_handshake(SSL *ssl); =head1 DESCRIPTION SSL_do_handshake() will wait for a SSL/TLS handshake to take place. If the connection is in client mode, the handshake will be started. The handshake routines may have to be explicitly set in advance using either L or L. =head1 NOTES The behaviour of SSL_do_handshake() depends on the underlying BIO. If the underlying BIO is B, SSL_do_handshake() will only return once the handshake has been finished or an error occurred, except for SGC (Server Gated Cryptography). For SGC, SSL_do_handshake() may return with -1, but SSL_get_error() will yield B and SSL_do_handshake() should be called again. If the underlying BIO is B, SSL_do_handshake() will also return when the underlying BIO could not satisfy the needs of SSL_do_handshake() to continue the handshake. In this case a call to SSL_get_error() with the return value of SSL_do_handshake() will yield B or B. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_do_handshake(). The action depends on the underlying BIO. When using a non-blocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue. =head1 RETURN VALUES The following return values can occur: =over 4 =item 1 The TLS/SSL handshake was successfully completed, a TLS/SSL connection has been established. =item 0 The TLS/SSL handshake was not successful but was shut down controlled and by the specifications of the TLS/SSL protocol. Call SSL_get_error() with the return value B to find out the reason. =item E0 The TLS/SSL handshake was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur of action is need to continue the operation for non-blocking BIOs. Call SSL_get_error() with the return value B to find out the reason. =back =head1 SEE ALSO L, L, L, L, L, L =cut