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L_DicomGetMacAlgorithm

Summary

Returns the Message Authentication Code (MAC) Algorithm (0400,0015) used in the creation of the specified Digital Signature.

Syntax

#include "ltdic.h"

L_LTDIC_API L_TCHAR* L_DicomGetMacAlgorithm(hDS,pSignatureItem)

Parameters

HDICOMDS hDS

A DICOM handle.

pDICOMELEMENT pSignatureItem

Pointer to a DICOMELEMENT structure that specifies the Digital Signatures Sequence Item which corresponds to the Digital Signature. This cannot be NULL.

Returns

The MAC Algorithm (0400,0015) used in the creation of the specified Digital Signature. The return value can be NULL. Currently, the possible values are:

Value	Meaning
RIPEMD160	The MAC Algorithm used is the RACE Integrity Primitives Evaluation (RIPEMD160) algorithm, a 160-bit cryptographic hash function.
SHA1	The MAC Algorithm used is the Secure Hash Algorithm (SHA1), a 160-bit cryptographic hash function.
MD5	The MAC Algorithm used is the Message Digest 5 (MD5) algorithm, which takes as input a message of arbitrary length and produces a 128-bit "message digest".

Comments

The Digital Signatures Sequence Item of a Digital Signature should reference an Item under the MAC Parameters Sequence associated with the Digital Signatures Sequence. The MAC Algorithm (0400,0015) under the referenced MAC Parameters Sequence Item specifies the algorithm used in generating the Message Authentication Code (MAC). The encrypted MAC is the digital signature itself. You can use this function to obtain the value of this Data Element: the expected values are: "RIPEMD160", "SHA1", and "MD5".

In addition to this function, the following functions can be used to get information about the Digital Signature: