Openvpn --show-ciphers
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C:\Users\wolfm>openvpn --show-ciphers The following ciphers and cipher modes are available for use with OpenVPN. Each cipher shown below may be use as a parameter to the --cipher option. The default key size is shown as well as whether or not it can be changed with the --keysize directive. Using a CBC or GCM mode is recommended. In static key mode only CBC mode is allowed. AES-128-CBC (128 bit key, 128 bit block) AES-128-CFB (128 bit key, 128 bit block, TLS client/server mode only) AES-128-CFB1 (128 bit key, 128 bit block, TLS client/server mode only) AES-128-CFB8 (128 bit key, 128 bit block, TLS client/server mode only) AES-128-GCM (128 bit key, 128 bit block, TLS client/server mode only) AES-128-OFB (128 bit key, 128 bit block, TLS client/server mode only) AES-192-CBC (192 bit key, 128 bit block) AES-192-CFB (192 bit key, 128 bit block, TLS client/server mode only) AES-192-CFB1 (192 bit key, 128 bit block, TLS client/server mode only) AES-192-CFB8 (192 bit key, 128 bit block, TLS client/server mode only) AES-192-GCM (192 bit key, 128 bit block, TLS client/server mode only) AES-192-OFB (192 bit key, 128 bit block, TLS client/server mode only) AES-256-CBC (256 bit key, 128 bit block) AES-256-CFB (256 bit key, 128 bit block, TLS client/server mode only) AES-256-CFB1 (256 bit key, 128 bit block, TLS client/server mode only) AES-256-CFB8 (256 bit key, 128 bit block, TLS client/server mode only) AES-256-GCM (256 bit key, 128 bit block, TLS client/server mode only) AES-256-OFB (256 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-128-CBC (128 bit key, 128 bit block) CAMELLIA-128-CFB (128 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-128-CFB1 (128 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-128-CFB8 (128 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-128-OFB (128 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-192-CBC (192 bit key, 128 bit block) CAMELLIA-192-CFB (192 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-192-CFB1 (192 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-192-CFB8 (192 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-192-OFB (192 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-256-CBC (256 bit key, 128 bit block) CAMELLIA-256-CFB (256 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-256-CFB1 (256 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-256-CFB8 (256 bit key, 128 bit block, TLS client/server mode only) CAMELLIA-256-OFB (256 bit key, 128 bit block, TLS client/server mode only) SEED-CBC (128 bit key, 128 bit block) SEED-CFB (128 bit key, 128 bit block, TLS client/server mode only) SEED-OFB (128 bit key, 128 bit block, TLS client/server mode only) The following ciphers have a block size of less than 128 bits, and are therefore deprecated. Do not use unless you have to. BF-CBC (128 bit key by default, 64 bit block) BF-CFB (128 bit key by default, 64 bit block, TLS client/server mode only) BF-OFB (128 bit key by default, 64 bit block, TLS client/server mode only) CAST5-CBC (128 bit key by default, 64 bit block) CAST5-CFB (128 bit key by default, 64 bit block, TLS client/server mode only) CAST5-OFB (128 bit key by default, 64 bit block, TLS client/server mode only) DES-CBC (64 bit key, 64 bit block) DES-CFB (64 bit key, 64 bit block, TLS client/server mode only) DES-CFB1 (64 bit key, 64 bit block, TLS client/server mode only) DES-CFB8 (64 bit key, 64 bit block, TLS client/server mode only) DES-EDE-CBC (128 bit key, 64 bit block) DES-EDE-CFB (128 bit key, 64 bit block, TLS client/server mode only) DES-EDE-OFB (128 bit key, 64 bit block, TLS client/server mode only) DES-EDE3-CBC (192 bit key, 64 bit block) DES-EDE3-CFB (192 bit key, 64 bit block, TLS client/server mode only) DES-EDE3-CFB1 (192 bit key, 64 bit block, TLS client/server mode only) DES-EDE3-CFB8 (192 bit key, 64 bit block, TLS client/server mode only) DES-EDE3-OFB (192 bit key, 64 bit block, TLS client/server mode only) DES-OFB (64 bit key, 64 bit block, TLS client/server mode only) DESX-CBC (192 bit key, 64 bit block) IDEA-CBC (128 bit key, 64 bit block) IDEA-CFB (128 bit key, 64 bit block, TLS client/server mode only) IDEA-OFB (128 bit key, 64 bit block, TLS client/server mode only) RC2-40-CBC (40 bit key by default, 64 bit block) RC2-64-CBC (64 bit key by default, 64 bit block) RC2-CBC (128 bit key by default, 64 bit block) RC2-CFB (128 bit key by default, 64 bit block, TLS client/server mode only) RC2-OFB (128 bit key by default, 64 bit block, TLS client/server mode only)