crypto/weakcrypto/source/cryptoswitch/cryptoswitch.cpp
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     1 /*
       
     2 * Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
       
     3 * All rights reserved.
       
     4 * This component and the accompanying materials are made available
       
     5 * under the terms of the License "Eclipse Public License v1.0"
       
     6 * which accompanies this distribution, and is available
       
     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
       
     8 *
       
     9 * Initial Contributors:
       
    10 * Nokia Corporation - initial contribution.
       
    11 *
       
    12 * Contributors:
       
    13 *
       
    14 * Description: 
       
    15 *
       
    16 */
       
    17 
       
    18 
       
    19 #include <emulator.h>
       
    20 
       
    21 
       
    22 extern "C" {
       
    23 
       
    24 #include "cryptography_stubs.h"
       
    25 
       
    26 FARPROC vector[MAX_ORDINAL+1];
       
    27 
       
    28 void fill_vector(HINSTANCE aDll)
       
    29 	{
       
    30 	int i;
       
    31 	for (i=1;i<=MAX_ORDINAL;i++)
       
    32 		{
       
    33 		vector[i] = GetProcAddress(aDll, (LPCSTR)i);
       
    34 		}
       
    35 	vector[0] = (FARPROC)1;		// initialised
       
    36 	}
       
    37 
       
    38 void init_vector()
       
    39 	{
       
    40 	__LOCK_HOST;		// prevent deadlock with EKA2 scheduler
       
    41 
       
    42 	HINSTANCE instance;
       
    43 	
       
    44 	// Try for strong cryptography
       
    45 	//
       
    46 	instance = LoadLibraryA("strong_cryptography.dll"); 
       
    47 	if (instance != NULL)
       
    48 		{
       
    49 		fill_vector(instance);
       
    50 		return;
       
    51 		}
       
    52 		
       
    53 	// Try for weak cryptography
       
    54 	//
       
    55 	instance = LoadLibraryA("weak_cryptography.dll"); 
       
    56 	if (instance != NULL)
       
    57 		{
       
    58 		fill_vector(instance);
       
    59 		return;
       
    60 		}
       
    61 	
       
    62 	// die
       
    63 	//
       
    64 	OutputDebugStringA("Unable to load cryptography implementation");
       
    65 	_asm int 3;
       
    66 	}
       
    67 	
       
    68 __declspec(naked) void common_dispatch()
       
    69 	{
       
    70 	_asm cmp	dword ptr vector,0		// initialised?
       
    71 	_asm jne  	call_though_vector
       
    72 	_asm push	eax
       
    73 	_asm push	ecx
       
    74 	_asm push	edx
       
    75 	_asm call	init_vector
       
    76 	_asm pop	edx
       
    77 	_asm pop 	ecx
       
    78 	_asm pop 	eax
       
    79 call_though_vector:
       
    80 	_asm jmp	[vector+eax*4]
       
    81 	}
       
    82 
       
    83 }