dcmsign

NAME

dcmsign − Sign and Verify DICOM Files

SYNOPSIS

dcmsign [options] dcmfile-in [dcmfile-out]

DESCRIPTION

The dcmsign utility reads a DICOM file (dicomfile-in), performs a digital signature operation and, if any modification has taken place, writes the DICOM object to an output file (dicomfile-out).

Five digital signature operations are supported:

	•		verification of all signatures in the DICOM file
	•		creation of a new digital signature located in the main dataset,
	•		creation of a new digital signature in an item of a sequence embedded within the dataset,
	•		removal of a single digital signature from the DICOM file, and
	•		removal of all digital signatures from the DICOM file.

PARAMETERS

dcmfile-in DICOM input filename to be processed

dcmfile-out DICOM output filename

OPTIONS

general options
-h --help
print this help text and exit

--version
print version information and exit

-v --verbose
verbose mode, print processing details

-d --debug
debug mode, print debug information

+d --dump [f]ilename: string
dump byte stream fed into the MAC codec to file
(only with --sign or --sign-item)

input options
input file format:

+f --read-file
read file format or data set (default)

+fo --read-file-only
read file format only

-f --read-dataset
read data set without file meta information

input transfer syntax:

-t= --read-xfer-auto
use TS recognition (default)

-td --read-xfer-detect
ignore TS specified in the file meta header

-te --read-xfer-little
read with explicit VR little endian TS

-tb --read-xfer-big
read with explicit VR big endian TS

-ti --read-xfer-implicit
read with implicit VR little endian TS
signature commands
--verify
verify all signatures (default)

+s --sign private key file, certificate file: string
create signature in main object

+si --sign-item keyfile, certfile, item location: string
create signature in sequence item

+r --remove signature UID: string
remove signature

+ra --remove-all
remove all signatures from data set
signature creation options (only with --sign or --sign-item):
private key password options:

+ps --std-passwd
prompt user to type password on stdin (default)

+pw --use-passwd [p]assword: string
use specified password

-pw --null-passwd
use empty string as password

key and certificate file format options:

-pem --pem-keys
read keys/certificates as PEM file (default)

-der --der-keys
read keys/certificates as DER file

digital signature profile options:

-pf --profile-none
don’t enforce any signature profile (default)

+pb --profile-base
enforce base RSA signature profile

+pc --profile-creator
enforce creator RSA signature profile

+pa --profile-auth
enforce authorization signature profile

MAC algorithm options:

+mr --mac-ripemd160
use RIPEMD 160 (default)

+ms --mac-sha1
use SHA-1

+mm --mac-md5
use MD 5

tag selection options:

-t --tag
tag: "xxxx,xxxx" or a data dictionary name
sign only specified tag
this option can be specified multiple times

-tf --tag-file filename: string
read list of tags from text file

signature format options:

-fn --format-new
use correct DICOM signature format (default)

-fo --format-old
use old (pre-3.5.4) DCMTK signature format, non-conformant
if signature includes compressed pixel data

output options
output transfer syntax:

+t= --write-xfer-same
write with same TS as input (default)

+te --write-xfer-little
write with explicit VR little endian TS

+tb --write-xfer-big
write with explicit VR big endian TS

+ti --write-xfer-implicit
write with implicit VR little endian TS

length encoding in sequences and items:

+e --length-explicit
write with explicit lengths (default)

-e --length-undefined
write with undefined lengths

NOTES

Files and Parameters
The dcmsign utility reads and writes a number of files and file formats which are described in this section.
Public Key Certificates are expected in X.509v3 format, either with PEM or DER encoding. The dcmsign utility currently supports RSA and DSA public keys, although only RSA keys are defines in the Security Profiles of the DICOM standard.
Private Keys are expected in PEM or DER encoding. PEM is recommended (and default) because this allows to keep private keys in encrypted form. Command line options control the behaviour of dcmsign when an encrypted PEM key is opened (see above). In general it is not recommended to specify the encryption password in the command line because the command line may be visible to other processes in the system, e.g. ’ps -ef’.
The list of data elements to sign can either be read from a file or specified on the command line or both (in this case the keys are combined).
On the command line, attribute keys are specified as
--tag "gggg,eeee" where gggg and eeee are the hexadecimal group
and element numbers
--tag "Name" where ’Name’ is a symbolic attribute name from
the DICOM dictionary (see below).
When attribute tags are read from file with the --tag-file option, a plain text file of max. 64 kbyte is expected. Tags within the file are either symbolic names from the data dictionary or have the format (gggg,eeee) (with braces). Tags are separated by one or more whitespace characters.
The --sign-item operation requires a location string that describes in which sequence item a signature is to be created. The location string has the following format:
SequenceName[index].SequenceName[index].SequenceName[index](...)
where SequenceName is either a symbolic attribute name from the data dictionary or a numeric tag in the format (gggg,eeee) and index is an unsigned decimal integer for the item number, starting with zero for the first item in a sequence. As an example, the following location string
ReferencedSeriesSequence[0].ReferencedImageSequence[1]
would cause a digital signature to be created in the second item of the ReferencedImageSequence (0008,1140) which is located in the first item of the ReferencedSeriesSequence (0008,1115) which is located in the main DICOM dataset.

COMMAND LINE

All command line tools use the following notation for parameters: square brackets enclose optional values (0-1), three trailing dots indicate that multiple values are allowed (1-n), a combination of both means 0 to n values.
Command line options are distinguished from parameters by a leading ’+’ or ’-’ sign, respectively. Usually, order and position of command line options are arbitrary (i.e. they can appear anywhere). However, if options are mutually exclusive the rightmost appearance is used. This behaviour conforms to the standard evaluation rules of common Unix shells.
In addition, one or more command files can be specified using an ’@’ sign as a prefix to the filename (e.g. AT command DOT txt). Such a command argument is replaced by the content of the corresponding text file (multiple whitespaces are treated as a single separator) prior to any further evaluation. Please note that a command file cannot contain another command file. This simple but effective approach allows to summarize common combinations of options/parameters and avoids longish and confusing command lines (an example is provided in file share/data/dumppat.txt).

ENVIRONMENT

The dcmsign utility will attempt to load DICOM data dictionaries specified in the DCMDICTPATH environment variable. By default, i.e. if the DCMDICTPATH environment variable is not set, the file <PREFIX>/lib/dicom.dic will be loaded unless the dictionary is built into the application (default for Windows).
The default behaviour should be preferred and the DCMDICTPATH environment variable only used when alternative data dictionaries are required. The DCMDICTPATH environment variable has the same format as the Unix shell PATH variable in that a colon (’:’) separates entries. The data dictionary code will attempt to load each file specified in the DCMDICTPATH environment variable. It is an error if no data dictionary can be loaded.

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