Hot answers tagged openssl
Not a definite answer but too much for comments: That help msg shows that OpenSSL on OSX is an old version (<= 0.9.8) before GCM was added. (Probably =; 0.9.7 end-of-lifed around 2008. -salt has been the default since about 2004 so anyone who claims you need to specify it should be treated very skeptically.) You could add HMAC on top of AES-CBC ...
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