L_DicomGetEncryptKeyLengthTLS

Summary

Returns the effective length (in bits) of the encryption key associated with the specified ciphersuite (56 for DES etc). This function is available in Medical Suite toolkits.

Syntax

#include "ltdic.h"

L_LTDIC_API L_UINT32 L_DicomGetEncryptKeyLengthTLS(hNet, cipher)

Parameters

HDICOMNET hNet

Handle to an existing DICOM Network. This is the handle returned from the L_DicomCreateNet function.

L_CIPHERSUITE cipher

Value that indicates the ciphersuite for which to get the length of the encryption key.

Returns

Returns the effective length of the encryption key associated with the specified ciphersuite.

Comments

There are differences between the size of the key and the effective length. The security of a key is given by the effective length, not by the size (a DES key has 8 bytes, just like a DES40 key, but the first has 56 bits effective, and the second only 40.)

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

L_INT DicomGetEncryptKeyLengthTLSExample(L_VOID) 
{ 
   HDICOMNET hDicomNet = NULL; 
   L_INT nRet; 
 
   hDicomNet = L_DicomCreateNetExt(MAKE_IMAGE_PATH(TEXT("")), DICOM_SECURE_TLS, NULL); 
 
   nRet = L_DicomGetEncryptKeyLengthTLS(hDicomNet, TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA); 
   L_TCHAR strMsg[64]; 
   wsprintf(strMsg, TEXT("Effective key length for TLS_DHE_RSA_WITH_DES_EDE_CBC_SHA is %d"), nRet); 
   MessageBox(NULL, strMsg, TEXT(""), MB_OK); 
 
   return DICOM_SUCCESS; 
}
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