VERIFIER(1)						      General Commands Manual						       VERIFIER(1)

NAME

       rdd-verify - verifies checksums and hash values generated by rdd-copy(1)

SYNOPSIS

       rdd-verify [OPTION] file1 ...

DESCRIPTION

       Rdd-verify  verifies  checksums	and  hash values generated by rdd-copy(1).  Rdd stores checksums (Adler32 or CRC32) in files.  These files
       must be passed to rdd-verify for verification.

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

       Rdd-verify reads all input files (file1, ...) and recomputes the checksums and hash values that the user wishes to verify.   The  verifica-
       tion will very likely fail if the concatenation of the input files is different from the source that was copied by rdd-copy(1).

OUTPUT

       All verification errors are reported on stderr.

OPTIONS

       -?, --help
	      Print a usage message.

       -V, --version
	      Report version number and exit.

       -v, --verbose
	      Be verbose (more messages).

       -v, --verbose
	      Be verbose (more messages).

       --checksum, --adler32 file
	      Verify the Adler32 checksums stored in file.

       --crc, --crc32 file
	      Verify the CRC32 checksums stored in file.

       --md5, --md5 digest
	      Recompute the MD5 hash value.  It should be equal to digest.

       --sha, --sha1 digest
	      Recompute the SHA1 hash value.  It should be equal to digest.

       A digest argument is a hexadecimal string.  Leading zeroes may not be omitted.

EXAMPLES

       rdd-verify --md5 0123456789abcdef0123456789abcdef disk.img

	      Compute the MD5 hash value over disk.img and verify whether it equals 0123456789abcdef0123456789abcdef.

       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.

SEE ALSO

       rdd-copy(1)

REPORTING BUGS

       Report bugs to <rdd@holmes.nl>.

ACKNOWLEDGEMENTS

       Many thanks to all who reported bugs and successes, and who suggested improvements.  You know who you are.

COPYRIGHT

       Copyright (C) 2002-2003 Netherlands Forensic Institute
       This software comes with NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

rdd-verify							   February 2002						       VERIFIER(1)