Commit e92057
2025-02-11 11:26:09 Samuli Seppänen: -/-| /dev/null .. FAQ/291-on-slackware-i-get-the-error-cipher-algorithm-bf-cbc-not-found-openssl.md | |
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| + | # On Slackware, I get the error: Cipher algorithm 'BF-CBC' not found (OpenSSL) |
| + | |
| + | **NOTE: this article is very outdated. Modern OpenVPN negotiates ciphers between peers and --cipher is a no-op since OpenVPN 2.6. As such you're unlikely to encounter this issue anymore.** |
| + | |
| + | By default, OpenVPN uses the *blowfish* cipher for tunnel encryption. For some reason, some versions of Slackware have an OpenSSL library built without Blowfish cipher support. |
| + | |
| + | The fix is either: |
| + | - Rebuild the OpenSSL library to include blowfish, or |
| + | - Use the `--cipher` option to choose a different cipher. The command `openvpn --show-ciphers` will show the available ciphers. For example `--cipher DES-EDE3-CBC` will select Triple-DES encryption. |