SiMACConstructor Class Reference

a class that allows to feed selected parts of a DICOM dataset into the MAC generation code More...

Collaboration diagram for SiMACConstructor:

Public Member Functions
	SiMACConstructor ()
	constructor
virtual	~SiMACConstructor ()
	destructor
OFCondition	encodeDataset (DcmItem &item, SiMAC &mac, E_TransferSyntax oxfer, DcmAttributeTag &tagListOut, DcmAttributeTag *tagListIn=NULL)
	encodes a DICOM dataset (or parts of it) as a byte stream in the format required for DICOM digital signatures and feeds the byte stream into the given MAC codec.
OFCondition	encodeDigitalSignatureItem (DcmItem &signatureItem, SiMAC &mac, E_TransferSyntax oxfer)
	encodes the contents of the digital signature sequence except CertificateOfSigner, Signature, CertifiedTimestampType and CertifiedTimestamp as a byte stream in the format required for DICOM digital signatures and feeds the byte stream into the given MAC codec.
OFCondition	flush (SiMAC &mac)
	flushes all buffers inside this object, finalizing the MAC code
void	setDumpFile (FILE *f)
	dump all data that is fed into the MAC algorithm into the given file, which must be opened and closed by caller.

Private Member Functions
	SiMACConstructor (SiMACConstructor &arg)
	private undefined copy constructor
SiMACConstructor &	operator= (SiMACConstructor &arg)
	private undefined copy assignment operator
OFCondition	flushBuffer (SiMAC &mac)
	flushes the internal buffer to the given MAC and to dumpFile if open
OFCondition	encodeElement (DcmElement *element, SiMAC &mac, E_TransferSyntax oxfer)
	feeds a DcmElement into the MAC data stream if is signable.

Static Private Member Functions
static OFBool	inTagList (const DcmElement *element, DcmAttributeTag *tagList)
	checks whether the attribute tag of the given DcmElement is contained in the given list of tags.

Private Attributes
unsigned char *	buf
	the buffer to which data is written
DcmOutputBufferStream	stream
	the internal buffer stream
FILE *	dumpFile
	if nonzero, the data fed to the MAC algorithm is also stored in this file.

Detailed Description

a class that allows to feed selected parts of a DICOM dataset into the MAC generation code

Definition at line 52 of file simaccon.h.

Member Function Documentation

OFCondition SiMACConstructor::encodeDataset	(	DcmItem &	item,
		SiMAC &	mac,
		E_TransferSyntax	oxfer,
		DcmAttributeTag &	tagListOut,
		DcmAttributeTag *	tagListIn = NULL
	)

encodes a DICOM dataset (or parts of it) as a byte stream in the format required for DICOM digital signatures and feeds the byte stream into the given MAC codec.

If a dump file was set with setDumpFile(), the byte stream is written to file as well.

Parameters

item	the DICOM dataset to be encoded
mac	the MAC codec into which the resulting byte stream is fed
oxfer	the transfer syntax to be used when encoding the dataset. The caller might wish to use DcmItem::canWriteXfer() to check beforehand whether this transfer syntax can be used.
tagListOut	upon return this parameter contains the list of attribute tags which were fed into the MAC codec. For sequences, only the sequence attribute tag is contained in this list; the items and elements within the items are not encoded.
tagListIn	optional parameter restricting the parts of the dataset to be encoded. Only elements which are present in this list of tags, which are signable (see DcmTagKey::isSignable()) and are present in the dataset are encoded. Upon verification of a signature the caller might wish to compare tagListIn and tagListOut after successful return to see whether the lists of attributes are the same. If parameter is absent or NULL, a global match is assumed, i.e. all elements of the dataset which are present and signable are encoded.

Returns

status code

OFCondition SiMACConstructor::encodeDigitalSignatureItem	(	DcmItem &	signatureItem,
		SiMAC &	mac,
		E_TransferSyntax	oxfer
	)

encodes the contents of the digital signature sequence except CertificateOfSigner, Signature, CertifiedTimestampType and CertifiedTimestamp as a byte stream in the format required for DICOM digital signatures and feeds the byte stream into the given MAC codec.

If a dump file was set with setDumpFile(), the byte stream is written to file as well.

Parameters

signatureItem	the DICOM digital signature item to be encoded
mac	the MAC codec into which the resulting byte stream is fed
oxfer	the transfer syntax to be used when encoding the dataset. The caller might wish to use DcmItem::canWriteXfer() to check beforehand whether this transfer syntax can be used.

Returns

status code

OFCondition SiMACConstructor::encodeElement ( DcmElement *  element, SiMAC &  mac, E_TransferSyntax  oxfer  )

private

feeds a DcmElement into the MAC data stream if is signable.

If the element is a sequence, all signable elements from all items are added.

Parameters

element	pointer to element, must not be NULL
mac	MAC to use
oxfer	transfer syntax in which data is encoded

Returns

status code

OFCondition SiMACConstructor::flush

(

SiMAC &

mac

)

flushes all buffers inside this object, finalizing the MAC code

Parameters

mac	the MAC codec into which the resulting byte stream is fed

Returns

status code

OFCondition SiMACConstructor::flushBuffer ( SiMAC &  mac )

private

flushes the internal buffer to the given MAC and to dumpFile if open

Parameters

mac	MAC to which the buffer content is added

Returns

error code from MAC

static OFBool SiMACConstructor::inTagList ( const DcmElement *  element, DcmAttributeTag *  tagList  )

staticprivate

checks whether the attribute tag of the given DcmElement is contained in the given list of tags.

If the list is absent (NULL), a universal match is assumed, i.e. always returns true if element is nonzero. Does not check whether an element is signable.

Parameters

element	pointer to element to check
tagList	pointer to list of attribute tags, may be NULL

Returns

true if attribute is in tag list, false otherwise

void SiMACConstructor::setDumpFile

(

FILE *

f

)

dump all data that is fed into the MAC algorithm into the given file, which must be opened and closed by caller.

Parameters

f	pointer to file already opened for writing; may be NULL.

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The documentation for this class was generated from the following file:

• dcmsign/include/dcmtk/dcmsign/simaccon.h