5.3 Available cipher modes
- No mode specified. This should not be used. The only exception is that
if Libgcrypt is not used in FIPS mode and if any debug flag has been
set, this mode may be used to bypass the actual encryption.
- Electronic Codebook mode.
- Cipher Feedback mode. The shift size equals the block size of the
cipher (e.g. for AES it is CFB-128).
- Cipher Block Chaining mode.
- Stream mode, only to be used with stream cipher algorithms.
- Output Feedback mode.
- Counter mode.