2021 library versions: OpenSSL 1.1.0l 10 Sep 2019, LZO 2.10 openvpn --show-digests MD5 128 bit digest size RSA-MD5 128 bit digest size SHA1 160 bit digest size RSA-SHA1 160 bit digest size MDC2 128 bit digest size RSA-MDC2 128 bit digest size MD5-SHA1 288 bit digest size RSA-SHA1-2 160 bit digest size RIPEMD160 160 bit digest size RSA-RIPEMD160 160 bit digest size MD4 128 bit digest size RSA-MD4 128 bit digest size RSA-SHA256 256 bit digest size RSA-SHA384 384 bit digest size RSA-SHA512 512 bit digest size RSA-SHA224 224 bit digest size SHA256 256 bit digest size SHA384 384 bit digest size SHA512 512 bit digest size SHA224 224 bit digest size whirlpool 512 bit digest size BLAKE2b512 512 bit digest size BLAKE2s256 256 bit digest size openvpn --show-ciphers 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) openvpn --show-tls Available TLS Ciphers, listed in order of preference: For TLS 1.2 and older (--tls-cipher): TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384 TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384 TLS-DHE-RSA-WITH-AES-256-GCM-SHA384 TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256 TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256 TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256 TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256 TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256 TLS-DHE-RSA-WITH-AES-128-GCM-SHA256 TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA384 TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384 TLS-DHE-RSA-WITH-AES-256-CBC-SHA256 TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256 TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA256 TLS-DHE-RSA-WITH-AES-128-CBC-SHA256 TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA TLS-DHE-RSA-WITH-AES-256-CBC-SHA TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA TLS-DHE-RSA-WITH-AES-128-CBC-SHA