SYD-AES(1)                  General Commands Manual                 SYD-AES(1)

NAME
       syd-aes - AES-CTR encryption and decryption utility

SYNOPSIS
       syd-aes [-hv] -e|-d -k <key-hex> -i <iv-hex> -t <tag-str>

DESCRIPTION
       The syd-aes utility uses the Linux Kernel Cryptography API to encrypt
       and decrypt data using AES-CTR mode. It supports both encryption and
       decryption operations, with the key and IV provided as hexadecimal
       strings. Given data from standard input, syd-aes performs the specified
       operation and outputs the result to standard output. syd-aes uses pipes
       and splice(2) to transfer data using zero-copy, and therefore able to
       encrypt/decrypt files of arbitrary size.

OPTIONS

       -h         Display help.
       -v         Enable verbose mode. If standard error is a terminal, print
                  progress updates periodically, similar to dd(1).
       -e         Encrypt the input data.
       -d         Decrypt the input data.
       -k <key>   Hex-encoded key (256 bits).
       -i <iv>    Hex-encoded IV (128 bits).
       -t <tag>   Information tag for HKDF (optional, max is 255 x 32 = 8160
                  bytes).


SEE ALSO
       syd(1), syd(2), syd(5), splice(2), syd-key(1)

       syd homepage: https://sydbox.exherbolinux.org/

AUTHORS
       Maintained by Ali Polatel. Up-to-date sources can be found at
       https://gitlab.exherbo.org/sydbox/sydbox.git and bugs/patches can be
       submitted to https://gitlab.exherbo.org/groups/sydbox/-/issues. Discuss
       in #sydbox on Libera Chat.

                                  2025-02-14                        SYD-AES(1)