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.TH "SYD-SUM" "1" "2026-03-22"
.PP
.SH NAME
.PP
\fBsyd-sum\fR - Calculate checksum of the given file or standard input
.PP
.SH SYNOPSIS
.PP
\fBsyd-sum\fR \fI-a alg\fR \fI[-bhx]\fR \fI<file|->\fR
.PP
.SH DESCRIPTION
.PP
Given a file, calculate the checksum of the file using the Linux Kernel
Crypto API (AF_ALG).\&
.PP
Only regular files and FIFOs (pipes) may be hashed.\&
.PP
Given no positional arguments or "-" as argument, calculate checksum of
standard input.\&
.PP
.SH OPTIONS
.PP
.TS
l lx
l lx
l lx
l lx
l lx
l lx
l lx.
T{
\fB-a\fR \fBalg\fR
T}	T{
Hash algorithm to use (required).\&
T}
T{

T}	T{
Any algorithm listed in proc_crypto(5) with type \fIahash\fR or \fIshash\fR may be used.\&
T}
T{

T}	T{
Use \fB-a list\fR to list available algorithms.\&
T}
T{

T}	T{
Examples: sha256, sha512, sha3-512, blake2b-256, md5, crc32c
T}
T{
\fB-b\fR
T}	T{
Binary output.\&
T}
T{
\fB-x\fR
T}	T{
Hexadecimal output (default).\&
T}
T{
\fB-h\fR
T}	T{
Display help.\&
T}
.TE
.sp 1
.SH EXAMPLES
.PP
.nf
.RS 4
syd-sum -a sha256 /usr/bin/syd
echo hello | syd-sum -a blake2b-512
syd-sum -a crc32c -b /etc/passwd > /tmp/crc\&.bin
.fi
.RE
.PP
.SH SEE ALSO
.PP
\fIsyd\fR(1), \fIsyd\fR(2), \fIsyd\fR(5), \fIsyd-path\fR(1), \fIproc_crypto\fR(5)
.PP
\fBsyd\fR homepage: https://sydbox.\&exherbo.\&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 or in #sydbox:mailstation.\&de on Matrix.\&