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.TH "SYD-AES" "1" "2025-02-14"
.PP
.SH NAME
.PP
syd-aes - AES-CTR encryption and decryption utility
.PP
.SH SYNOPSIS
.PP
\fBsyd-aes\fR \fI[-hv]\fR \fI-e|-d\fR \fI-k <key-hex>\fR \fI-i <iv-hex>\fR \fI-t <tag-str>\fR
.PP
.SH DESCRIPTION
.PP
The \fBsyd-aes\fR 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, \fBsyd-aes\fR performs the
specified operation and outputs the result to standard output.\&
\fBsyd-aes\fR uses pipes and \fIsplice\fR(2) to transfer data using zero-copy,
and therefore able to encrypt/decrypt files of arbitrary size.\&
.PP
.SH OPTIONS
.PP
.TS
l lx
l lx
l lx
l lx
l lx
l lx
l lx.
T{
\fB-h\fR
T}	T{
Display help.\&
T}
T{
\fB-v\fR
T}	T{
Enable verbose mode.\& If standard error is a terminal, print progress updates periodically, similar to \fBdd\fR(1).\&
T}
T{
\fB-e\fR
T}	T{
Encrypt the input data.\&
T}
T{
\fB-d\fR
T}	T{
Decrypt the input data.\&
T}
T{
\fB-k <key>\fR
T}	T{
Hex-encoded key (256 bits).\&
T}
T{
\fB-i <iv>\fR
T}	T{
Hex-encoded IV (128 bits).\&
T}
T{
\fB-t <tag>\fR
T}	T{
Information tag for HKDF (optional, max is 255 x 32 = 8160 bytes).\&
T}
.TE
.sp 1
.SH SEE ALSO
.PP
\fIsyd\fR(1), \fIsyd\fR(2), \fIsyd\fR(5), \fIsplice\fR(2), \fIsyd-key\fR(1)
.PP
\fBsyd\fR homepage: https://sydbox.\&exherbolinux.\&org/
.PP
.SH AUTHORS
.PP
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.\&