.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.16.
.TH SHA1CDSUM "1" "December 2020" "sha1cdsum 0.2.3" "User Commands"
.SH NAME
sha1cdsum \- SHA-1 digests with collision detection
.SH DESCRIPTION
sha1cdsum 0.2.3
Print or check SHA1 (160\-bit) checksums with collision detection.
.SS "USAGE:"
.IP
sha1cdsum [FLAGS] [files]...
.SS "FLAGS:"
.TP
\fB\-b\fR, \fB\-\-binary\fR
read in binary mode
.TP
\fB\-c\fR, \fB\-\-check\fR
read SHA1 sums from the FILEs and check them
.TP
\fB\-h\fR, \fB\-\-help\fR
Prints help information
.TP
\fB\-\-tag\fR
create a BSD\-style checksum
.TP
\fB\-t\fR, \fB\-\-text\fR
read in text mode
.TP
\fB\-V\fR, \fB\-\-version\fR
Prints version information
.TP
\fB\-z\fR, \fB\-\-zero\fR
end each output line with NUL, not newline, and disable file name escaping
.TP
\fB\-\-ignore\-missing\fR
don't fail or report status for missing files
.TP
\fB\-\-quiet\fR
don't print OK for each successfully verified file
.TP
\fB\-\-status\fR
don't output anything, status code shows success
.TP
\fB\-\-strict\fR
exit non\-zero for improperly formatted checksum lines
.TP
\fB\-w\fR, \fB\-\-warn\fR
warn about improperly formatted checksum lines
.SS "ARGS:"
.TP
<files>...
Input file(s).  With no FILE, or when FILE is \-, read standard input
.PP
The last five options are useful only when verifying checksums.
.PP
The sums are computed using Marc Stevens' modified SHA1 that detects
collision attacks.  When checking, the input should be a former output
of this program.  The default mode is to print a line with checksum, a
space, a character indicating input mode ('*' for binary, ' ' for text
or where binary is insignificant), and name for each FILE.
.PP
If a collision is detected, '*coll*' is printed in front of the file
name.
.PP
Note: There is no difference between binary mode and text mode on GNU
systems.
.PP
This program implements the same interface as coreutils' sha1sum,
modulo error messages printed to stderr, handling of non\-UTF8
filenames, and bugs.
.SH "SEE ALSO"
.BR https://shattered.io/
.PP
.BR https://sha\-mbles.github.io/
.PP
.BR https://gitlab.com/sequoia-pgp/sha1collisiondetection