'\" t
.\"     Title: cryptsetup-tcryptdump
.\"    Author: [see the "AUTHOR(S)" section]
.\" Generator: Asciidoctor 2.0.18
.\"      Date: 2023-12-18
.\"    Manual: Maintenance Commands
.\"    Source: cryptsetup 2.6.1
.\"  Language: English
.\"
.TH "CRYPTSETUP\-TCRYPTDUMP" "8" "2023-12-18" "cryptsetup 2.6.1" "Maintenance Commands"
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.SH "NAME"
cryptsetup-tcryptDump \- dump the header information of a TCRYPT (TrueCrypt or VeraCrypt compatible) device
.SH "SYNOPSIS"
.sp
\fBcryptsetup \fItcryptDump\fP [<options>] <device>\fP
.SH "DESCRIPTION"
.sp
Dump the header information of a TCRYPT (TrueCrypt or VeraCrypt compatible) device.
.sp
If the \-\-dump\-volume\-key option is used, the TCRYPT device volume key is
dumped instead of TCRYPT header info. Beware that the volume key (or
concatenated volume keys if cipher chain is used) can be used to decrypt
the data stored in the TCRYPT container without a passphrase. This means
that if the volume key is compromised, the whole device has to be erased
to prevent further access. Use this option carefully.
.sp
\fB<options>\fP can be [\-\-dump\-volume\-key, \-\-key\-file, \-\-tcrypt\-hidden,
\-\-tcrypt\-system, \-\-tcrypt\-backup, \-\-veracrypt (ignored), \-\-disable\-veracrypt,
\-\-veracrypt\-pim, \-\-veracrypt\-query\-pim, \-\-cipher, \-\-hash, \-\-header,
\-\-verify\-passphrase, \-\-timeout].
.sp
The keyfile parameter allows a combination of file content with the
passphrase and can be repeated.
.SH "OPTIONS"
.sp
\fB\-\-hash, \-h\fP \fI<hash\-spec>\fP
.RS 4
Specifies the passphrase hash. Applies to \fIplain\fP and \fIloopaes\fP device types only.
.sp
For \fItcrypt\fP device type, it restricts checked PBKDF2 variants when looking for header.
.RE
.sp
\fB\-\-cipher, \-c\fP \fI<cipher\-spec>\fP
.RS 4
Set the cipher specification string for \fIplain\fP device type.
.sp
For \fItcrypt\fP device type it restricts checked cipher chains when looking for header.
.RE
.sp
\fB\-\-verify\-passphrase, \-y\fP
.RS 4
When interactively asking for a passphrase, ask for it twice and
complain if both inputs do not match.
Ignored on input from file or stdin.
.RE
.sp
\fB\-\-key\-file, \-d\fP \fIname\fP
.RS 4
Read the passphrase from file.
.sp
If the name given is "\-", then the passphrase will be read from stdin.
In this case, reading will not stop at newline characters.
.sp
See section \fINOTES ON PASSPHRASE PROCESSING\fP in \fBcryptsetup\fP(8) for more information.
.RE
.sp
\fB\-\-dump\-volume\-key, \-\-dump\-master\-key (OBSOLETE alias)\fP
.RS 4
Print the volume key in the displayed information. Use with care,
as the volume key can be used to bypass
the passphrases, see also option \-\-volume\-key\-file.
.RE
.sp
\fB\-\-timeout, \-t <number of seconds>\fP
.RS 4
The number of seconds to wait before timeout on passphrase input via
terminal. It is relevant every time a passphrase is asked.
It has no effect if used in conjunction with \-\-key\-file.
.sp
This option is useful when the system should not stall if the user
does not input a passphrase, e.g. during boot. The default is a value
of 0 seconds, which means to wait forever.
.RE
.sp
\fB\-\-header <device or file storing the LUKS header>\fP
.RS 4
Use a detached (separated) metadata device or file where the LUKS
header is stored. This option allows one to store ciphertext and LUKS
header on different devices.
.sp
For commands that change the LUKS header (e.g. \fIluksAddKey\fP),
specify the device or file with the LUKS header directly as the LUKS
device.
.RE
.sp
\fB\-\-tcrypt\-hidden\fP, \fB\-\-tcrypt\-system\fP, \fB\-\-tcrypt\-backup\fP
.RS 4
Specify which TrueCrypt on\-disk
header will be used to open the device. See \fITCRYPT\fP section in
\fBcryptsetup\fP(8) for more info.
.RE
.sp
\fB\-\-veracrypt\fP
.RS 4
This option is ignored as VeraCrypt compatible mode is supported by
default.
.RE
.sp
\fB\-\-disable\-veracrypt\fP
.RS 4
This option can be used to disable VeraCrypt compatible mode (only
TrueCrypt devices are recognized). Only for TCRYPT extension. See
\fITCRYPT\fP section in \fBcryptsetup\fP(8) for more info.
.RE
.sp
\fB\-\-veracrypt\-pim\fP, \fB\-\-veracrypt\-query\-pim\fP
.RS 4
Use a custom Personal Iteration Multiplier (PIM) for
VeraCrypt device. See \fITCRYPT\fP section in \fBcryptsetup\fP(8) for more info.
.RE
.sp
\fB\-\-batch\-mode, \-q\fP
.RS 4
Suppresses all confirmation questions. Use with care!
.sp
If the \-\-verify\-passphrase option is not specified, this option also
switches off the passphrase verification.
.RE
.sp
\fB\-\-debug or \-\-debug\-json\fP
.RS 4
Run in debug mode with full diagnostic logs. Debug output lines are
always prefixed by \fB#\fP.
.sp
If \-\-debug\-json is used, additional LUKS2 JSON data structures are printed.
.RE
.sp
\fB\-\-version, \-V\fP
.RS 4
Show the program version.
.RE
.sp
\fB\-\-usage\fP
.RS 4
Show short option help.
.RE
.sp
\fB\-\-help, \-?\fP
.RS 4
Show help text and default parameters.
.RE
.SH "REPORTING BUGS"
.sp
Report bugs at \c
.MTO "cryptsetup\(atlists.linux.dev" "\fBcryptsetup mailing list\fP"
or in \c
.URL "https://gitlab.com/cryptsetup/cryptsetup/\-/issues/new" "\fBIssues project section\fP" "."
.sp
Please attach output of the failed command with \-\-debug option added.
.SH "SEE ALSO"
.sp
.URL "https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions" "\fBCryptsetup FAQ\fP" ""
.sp
\fBcryptsetup\fP(8), \fBintegritysetup\fP(8) and \fBveritysetup\fP(8)
.SH "CRYPTSETUP"
.sp
Part of \c
.URL "https://gitlab.com/cryptsetup/cryptsetup/" "\fBcryptsetup project\fP" "."