ā03-16-2017 07:17 PM
ā03-21-2017 07:52 PM
-cipher cipherlistThere might be an exception related to server preferences, but this must be set within s_server SSL_CTX configuration
this allows the cipher list used by the server to be modified. When the client sends a list of supported ciphers the first client cipher also included in the server list is used. Because the client specifies the preference order, the order of the server cipherlist irrelevant. See the ciphers command for more information.
SSL_OP_CIPHER_SERVER_PREFERENCEYou might give it a try with simple test - capturing authentication between client and server or try to find ssl.h and double check it is not used.
When choosing a cipher, use the server's preferences instead of the client preferences. When not set, the SSL server will always follow the clients preferences. When set, the SSLv3/TLSv1 server will choose following its own preferences. Because of the different protocol, for SSLv2 the server will send its list of preferences to the client and the client chooses.
ā03-21-2017 07:52 PM
So it is implementation dependent. In openssl there are two modes:If EAC uses server preferences you may only benefit from it. Today TLS severs usually relay on Eliptic Curves - GCM based ciphers and upon response to client server may use only specific cipher. See below
- default is to choose the first compatible cipher suite from client hello.
- SSL_OP_CIPHER_SERVER_PREFERENCE to SSL_CTX_set_option to choose from server cipher list order
ā03-21-2017 07:52 PM
ā03-21-2017 07:52 PM