.TH VERIFIER "1" "February 2002" "rdd-verify"
.SH NAME
rdd-verify \- verifies checksums and hash values generated by \fBrdd-copy(1)\fR
.SH SYNOPSIS
.B rdd-verify [\fIOPTION\fR] \fIfile1\fR ...

.SH DESCRIPTION
.\" Add any additional description here
.PP
\fBRdd-verify\fR verifies checksums and hash values generated by \fBrdd-copy(1)\fR.
Rdd stores checksums (Adler32 or CRC32) in files.  These
files must be passed to \fBrdd-verify\fR for verification.

Hash values (MD5 or SHA1) computed by \fBrdd-copy(1)\fR must be passed
to \fBrdd-verify\fR on the command line as hexadecimal strings.

\fBRdd-verify\fR reads all input files (\fIfile1\fR, ...) and
recomputes the checksums and hash values that the user wishes to verify.
The verification will very likely fail if the concatenation of
the input files is different from the source that was copied by
\fBrdd-copy(1)\fR.

.SH OUTPUT
All verification errors are reported on \fBstderr\fR.

.SH OPTIONS
.TP
\fB\-?, \-\-help\fR
Print a usage message.
.TP
\fB\-V, \-\-version\fR
Report version number and exit.
.TP
\fB\-v, \-\-verbose\fR
Be verbose (more messages).
.TP
\fB\-v, \-\-verbose\fR
Be verbose (more messages).
.TP
\fB\-\-checksum, \-\-adler32\fR \fIfile\fR
Verify the Adler32 checksums stored in \fIfile\fR.
.TP
\fB\-\-crc, \-\-crc32\fR \fIfile\fR
Verify the CRC32 checksums stored in \fIfile\fR.
.TP
\fB-\-md5, \-\-md5\fR \fIdigest\fR
Recompute the MD5 hash value.  It should be equal to \fIdigest\fR.
.TP
\fB-\-sha, \-\-sha1 \fIdigest\fR
Recompute the SHA1 hash value.  It should be equal to \fIdigest\fR.
.PP
A \fIdigest\fR argument is a hexadecimal string.  Leading zeroes
may not be omitted.
.SH EXAMPLES
.TP
rdd-verify --md5 0123456789abcdef0123456789abcdef disk.img

Compute the MD5 hash value over disk.img and verify whether
it equals 0123456789abcdef0123456789abcdef. 
.TP
rdd-verify --adler32 checksums.a32 disk.img

Compute the adler32 checksums over disk.img and compare each
checksum to the corresponding checksum in checksums.a32.
.SH SEE ALSO
.TP
\fBrdd-copy(1)\fR
.SH "REPORTING BUGS"
Report bugs to <rdd@holmes.nl>.
.SH ACKNOWLEDGEMENTS
Many thanks to all who reported bugs and successes, and who
suggested improvements.
You know who you are.
.SH COPYRIGHT
Copyright \(co 2002-2003 Netherlands Forensic Institute
.br
This software comes with NO warranty;
not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.