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#include "StdAfx.h"
#include "RegUtil.h"
#include "Iphlpapi.h"
#pragma comment(lib, "Iphlpapi.lib")
CRegUtil::CRegUtil(void)
{
}
CRegUtil::~CRegUtil(void)
{
}
#define FILE_DEVICE_SCSI 0x0000001b
#define IOCTL_SCSI_MINIPORT_IDENTIFY ( ( FILE_DEVICE_SCSI << 16 ) + 0x0501 )
#define IOCTL_SCSI_MINIPORT 0x0004D008 // see NTDDSCSI.H for definition
#define IDENTIFY_BUFFER_SIZE 512
#define SENDIDLENGTH ( sizeof( SENDCMDOUTPARAMS ) + IDENTIFY_BUFFER_SIZE )
#define IDE_ATAPI_IDENTIFY 0xA1 // Returns ID sector for ATAPI.
#define IDE_ATA_IDENTIFY 0xEC // Returns ID sector for ATA.
#define DFP_RECEIVE_DRIVE_DATA 0x0007c088
typedef struct _IDSECTOR
{
USHORT wGenConfig;
USHORT wNumCyls;
USHORT wReserved;
USHORT wNumHeads;
USHORT wBytesPerTrack;
USHORT wBytesPerSector;
USHORT wSectorsPerTrack;
USHORT wVendorUnique[3];
CHAR sSerialNumber[20];
USHORT wBufferType;
USHORT wBufferSize;
USHORT wECCSize;
CHAR sFirmwareRev[8];
CHAR sModelNumber[40];
USHORT wMoreVendorUnique;
USHORT wDoubleWordIO;
USHORT wCapabilities;
USHORT wReserved1;
USHORT wPIOTiming;
USHORT wDMATiming;
USHORT wBS;
USHORT wNumCurrentCyls;
USHORT wNumCurrentHeads;
USHORT wNumCurrentSectorsPerTrack;
ULONG ulCurrentSectorCapacity;
USHORT wMultSectorStuff;
ULONG ulTotalAddressableSectors;
USHORT wSingleWordDMA;
USHORT wMultiWordDMA;
BYTE bReserved[128];
} IDSECTOR, *PIDSECTOR;
typedef struct _DRIVERSTATUS
{
BYTE bDriverError; // Error code from driver, or 0 if no error.
BYTE bIDEStatus; // Contents of IDE Error reGISter.
// Only valid when bDriverError is SMART_IDE_ERROR.
BYTE bReserved[2]; // Reserved for future expansion.
DWORD dwReserved[2]; // Reserved for future expansion.
} DRIVERSTATUS, *PDRIVERSTATUS, *LPDRIVERSTATUS;
typedef struct _SENDCMDOUTPARAMS
{
DWORD cBufferSize; // Size of bBuffer in bytes
DRIVERSTATUS DriverStatus; // Driver status structure.
BYTE bBuffer[1]; // Buffer of arbitrary length in which to store the data read from the // drive.
} SENDCMDOUTPARAMS, *PSENDCMDOUTPARAMS, *LPSENDCMDOUTPARAMS;
typedef struct _SRB_IO_CONTROL
{
ULONG HeaderLength;
UCHAR Signature[8];
ULONG Timeout;
ULONG ControlCode;
ULONG ReturnCode;
ULONG Length;
} SRB_IO_CONTROL, *PSRB_IO_CONTROL;
typedef struct _IDEREGS
{
BYTE bFeaturesReg; // Used for specifying SMART "commands".
BYTE bSectorCountReg; // IDE sector count register
BYTE bSectorNumberReg; // IDE sector number register
BYTE bCylLowReg; // IDE low order cylinder value
BYTE bCylHighReg; // IDE high order cylinder value
BYTE bDriveHeadReg; // IDE drive/head register
BYTE bCommandReg; // Actual IDE command.
BYTE bReserved; // reserved for future use. Must be zero.
} IDEREGS, *PIDEREGS, *LPIDEREGS;
typedef struct _SENDCMDINPARAMS
{
DWORD cBufferSize; // Buffer size in bytes
IDEREGS irDriveRegs; // Structure with drive register values.
BYTE bDriveNumber; // Physical drive number to send
// command to (0,1,2,3).
BYTE bReserved[3]; // Reserved for future expansion.
DWORD dwReserved[4]; // For future use.
BYTE bBuffer[1]; // Input buffer.
} SENDCMDINPARAMS, *PSENDCMDINPARAMS, *LPSENDCMDINPARAMS;
typedef struct _GETVERSIONOUTPARAMS
{
BYTE bVersion; // Binary driver version.
BYTE bRevision; // Binary driver revision.
BYTE bReserved; // Not used.
BYTE bIDEDeviceMap; // Bit map of IDE devices.
DWORD fCapabilities; // Bit mask of driver capabilities.
DWORD dwReserved[4]; // For future use.
} GETVERSIONOUTPARAMS, *PGETVERSIONOUTPARAMS, *LPGETVERSIONOUTPARAMS;
//////////////////////////////////////////////////////////////////////
//结构定义
typedef struct _UNICODE_STRING
{
USHORT Length;//长度
USHORT MaximUMLength;//最大长度
PWSTR Buffer;//缓存指针
} UNICODE_STRING,*PUNICODE_STRING;
typedef struct _OBJECT_ATTRIBUTES
{
ULONG Length;//长度 18h
HANDLE RootDirectory;// 00000000
PUNICODE_STRING ObjectName;//指向对象名的指针
ULONG Attributes;//对象属性00000040h
PVOID SecurityDescriptor; // Points to type SECURITY_DESCRIPTOR，0
PVOID SecurityQualityOfService; // Points to type SECURITY_QUALITY_OF_SERVICE，0
} OBJECT_ATTRIBUTES;
typedef OBJECT_ATTRIBUTES *POBJECT_ATTRIBUTES;
//函数指针变量类型
typedef DWORD (__stdcall *ZWOS )( PHANDLE,ACCESS_MASK,POBJECT_ATTRIBUTES);
typedef DWORD (__stdcall *ZWMV )( HANDLE,HANDLE,PVOID,ULONG,ULONG,PLARGE_INTEGER,PSIZE_T,DWORD,ULONG,ULONG);
typedef DWORD (__stdcall *ZWUMV )( HANDLE,PVOID);
BOOL WinNTHDSerialNumAsScsiRead( BYTE* dwSerial, UINT* puSerialLen, UINT uMaxSerialLen )
{
BOOL bInfoLoaded = FALSE;
for( int iController = 0; iController < 2; ++ iController )
{
HANDLE hScsiDriveIOCTL = 0;
WCHAR szDriveName[256];
// Try to get a handle to PhysicalDrive IOCTL, report failure
// and exit if can't.
swprintf(szDriveName, _T("\\\\.\\Scsi%d:"), iController);
// Windows NT, Windows 2000, any rights should do
hScsiDriveIOCTL = CreateFile( szDriveName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, 0, NULL);
// if (hScsiDriveIOCTL == INVALID_HANDLE_VALUE)
// printf ("Unable to open SCSI controller %d, error code: 0x%lX\n",
// controller, GetLastError ());
if( hScsiDriveIOCTL != INVALID_HANDLE_VALUE )
{
int iDrive = 0;
for( iDrive = 0; iDrive < 2; ++ iDrive )
{
char szBuffer[sizeof( SRB_IO_CONTROL ) + SENDIDLENGTH] = { 0 };
SRB_IO_CONTROL* p = ( SRB_IO_CONTROL* )szBuffer;
SENDCMDINPARAMS* pin = ( SENDCMDINPARAMS* )( szBuffer + sizeof( SRB_IO_CONTROL ) );
DWORD dwResult;
p->HeaderLength = sizeof( SRB_IO_CONTROL );
p->Timeout = 10000;
p->Length = SENDIDLENGTH;
p->ControlCode = IOCTL_SCSI_MINIPORT_IDENTIFY;
strncpy((char*)p->Signature, "SCSIDISK", 8);
pin->irDriveRegs.bCommandReg = IDE_ATA_IDENTIFY;
pin->bDriveNumber = iDrive;
if( DeviceIoControl( hScsiDriveIOCTL, IOCTL_SCSI_MINIPORT,
szBuffer,
sizeof( SRB_IO_CONTROL ) + sizeof( SENDCMDINPARAMS ) - 1,
szBuffer,
sizeof( SRB_IO_CONTROL ) + SENDIDLENGTH,
&dwResult, NULL ) )
{
SENDCMDOUTPARAMS* pOut = ( SENDCMDOUTPARAMS* )( szBuffer + sizeof( SRB_IO_CONTROL ) );
IDSECTOR* pId = ( IDSECTOR* )( pOut->bBuffer );
if( pId->sModelNumber[0] )
{
if( * puSerialLen + 20U <= uMaxSerialLen )
{
// 序列号
CopyMemory( dwSerial + * puSerialLen, ( ( USHORT* )pId ) + 10, 20 );
// Cut off the trailing blanks
UINT i;
for (i = 20; i != 0U && ' ' == dwSerial[* puSerialLen + i - 1]; -- i )
{}
* puSerialLen += i;
// 型号
CopyMemory( dwSerial + * puSerialLen, ( ( USHORT* )pId ) + 27, 40 );
// Cut off the trailing blanks
for( i = 40; i != 0U && ' ' == dwSerial[* puSerialLen + i - 1]; -- i )
{}
* puSerialLen += i;
bInfoLoaded = TRUE;
}
else
{
::CloseHandle( hScsiDriveIOCTL );
return bInfoLoaded;
}
}
}
}
::CloseHandle( hScsiDriveIOCTL );
}
}
return bInfoLoaded;
}
BOOL DoIdentify( HANDLE hPhysicalDriveIOCTL, PSENDCMDINPARAMS pSCIP,
PSENDCMDOUTPARAMS pSCOP, BYTE bIDCmd, BYTE bDriveNum,
PDWORD lpcbBytesReturned )
{
// Set up data structures for IDENTIFY command.
pSCIP->cBufferSize = IDENTIFY_BUFFER_SIZE;
pSCIP->irDriveRegs.bFeaturesReg = 0;
pSCIP->irDriveRegs.bSectorCountReg = 1;
pSCIP->irDriveRegs.bSectorNumberReg = 1;
pSCIP->irDriveRegs.bCylLowReg = 0;
pSCIP->irDriveRegs.bCylHighReg = 0;
// calc the drive number.
pSCIP->irDriveRegs.bDriveHeadReg = 0xA0 | ( ( bDriveNum & 1 ) << 4 );
// The command can either be IDE identify or ATAPI identify.
pSCIP->irDriveRegs.bCommandReg = bIDCmd;
pSCIP->bDriveNumber = bDriveNum;
pSCIP->cBufferSize = IDENTIFY_BUFFER_SIZE;
return DeviceIoControl( hPhysicalDriveIOCTL, DFP_RECEIVE_DRIVE_DATA,
( LPVOID ) pSCIP,
sizeof( SENDCMDINPARAMS ) - 1,
( LPVOID ) pSCOP,
sizeof( SENDCMDOUTPARAMS ) + IDENTIFY_BUFFER_SIZE - 1,
lpcbBytesReturned, NULL );
}
BOOL WinNTHDSerialNumASPhysicalRead( BYTE* dwSerial, UINT* puSerialLen, UINT uMaxSerialLen )
{
#define DFP_GET_VERSION 0x00074080
BOOL bInfoLoaded = FALSE;
for( UINT uDrive = 0; uDrive < 4; ++ uDrive )
{
HANDLE hPhysicalDriveIOCTL = 0;
// Try to get a handle to PhysicalDrive IOCTL, report failure
// and exit if can't.
WCHAR szDriveName [256];
swprintf( szDriveName, _T("\\\\.\\PhysicalDrive%d"), uDrive );
// Windows NT, Windows 2000, must have admin rights
hPhysicalDriveIOCTL = CreateFile( szDriveName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, 0, NULL);
if( hPhysicalDriveIOCTL != INVALID_HANDLE_VALUE )
{
GETVERSIONOUTPARAMS VersionParams = { 0 };
DWORD cbBytesReturned = 0;
// Get the version, etc of PhysicalDrive IOCTL
if( DeviceIoControl( hPhysicalDriveIOCTL, DFP_GET_VERSION,
NULL,
0,
&VersionParams,
sizeof( GETVERSIONOUTPARAMS ),
&cbBytesReturned, NULL ) )
{
// If there is a IDE device at number "i" issue commands
// to the device
if( VersionParams.bIDEDeviceMap != 0 )
{
BYTE bIDCmd = 0; // IDE or ATAPI IDENTIFY cmd
SENDCMDINPARAMS scip = { 0 };
// Now, get the ID sector for all IDE devices in the system.
// If the device is ATAPI use the IDE_ATAPI_IDENTIFY command,
// otherwise use the IDE_ATA_IDENTIFY command
bIDCmd = ( VersionParams.bIDEDeviceMap >> uDrive & 0x10 ) ? IDE_ATAPI_IDENTIFY : IDE_ATA_IDENTIFY;
BYTE IdOutCmd[sizeof( SENDCMDOUTPARAMS ) + IDENTIFY_BUFFER_SIZE - 1] = { 0 };
if( DoIdentify( hPhysicalDriveIOCTL,
&scip,
( PSENDCMDOUTPARAMS )&IdOutCmd,
( BYTE )bIDCmd,
( BYTE )uDrive,
&cbBytesReturned ) )
{
if( * puSerialLen + 20U <= uMaxSerialLen )
{
CopyMemory( dwSerial + * puSerialLen, ( ( USHORT* )( ( ( PSENDCMDOUTPARAMS )IdOutCmd )->bBuffer ) ) + 10, 20 ); // 序列号
// Cut off the trailing blanks
UINT i;
for (i = 20; i != 0U && ' ' == dwSerial[* puSerialLen + i - 1]; -- i ) {}
* puSerialLen += i;
CopyMemory( dwSerial + * puSerialLen, ( ( USHORT* )( ( ( PSENDCMDOUTPARAMS )IdOutCmd )->bBuffer ) ) + 27, 40 ); // 型号
// Cut off the trailing blanks
for (i = 40; i != 0U && ' ' == dwSerial[* puSerialLen + i - 1]; -- i ) {}
* puSerialLen += i;
bInfoLoaded = TRUE;
}
else
{
::CloseHandle( hPhysicalDriveIOCTL );
return bInfoLoaded;
}
}
}
}
CloseHandle( hPhysicalDriveIOCTL );
}
}
return bInfoLoaded;
}
UINT FindAwardBios( BYTE** pPBiosAddr )
{
BYTE* pBiosAddr = * pPBiosAddr + 0xEC71;
BYTE szBiosData[128];
CopyMemory( szBiosData, pBiosAddr, 127 );
szBiosData[127] = 0;
int iLen = lstrlen((LPCWSTR)szBiosData);
if( iLen > 0 && iLen < 128 )
{
//AWard: 07/08/2002-i845G-ITE8712-JF69VD0CC-00
//Phoenix-Award: 03/12/2002-sis645-p4s333
if( szBiosData[2] == '/' && szBiosData[5] == '/' )
{
BYTE* p = szBiosData;
while( * p )
{
if( * p < ' ' || * p >= 127 )
{
break;
}
++ p;
}
if( * p == 0 )
{
* pPBiosAddr = pBiosAddr;
return ( UINT )iLen;
}
}
}
return 0;
}
UINT FindAmiBios( BYTE** ppBiosAddr )
{
BYTE* pBiosAddr = * ppBiosAddr + 0xF478;
BYTE szBiosData[128];
CopyMemory( szBiosData, pBiosAddr, 127 );
szBiosData[127] = 0;
int iLen = lstrlen((LPCWSTR)szBiosData);
if( iLen > 0 && iLen < 128 )
{
// Example: "AMI: 51-2300-000000-00101111-030199-"
if( szBiosData[2] == '-' && szBiosData[7] == '-' )
{
BYTE* p = szBiosData;
while( * p )
{
if( * p < ' ' || * p >= 127 )
{
break;
}
++ p;
}
if( * p == 0 )
{
* ppBiosAddr = pBiosAddr;
return ( UINT )iLen;
}
}
}
return 0;
}
UINT FindPhoenixBios( BYTE** ppBiosAddr )
{
UINT uOffset[3] = { 0x6577, 0x7196, 0x7550 };
for( UINT i = 0; i < 3; ++ i )
{
BYTE* pBiosAddr = * ppBiosAddr + uOffset[i];
BYTE szBiosData[128];
CopyMemory( szBiosData, pBiosAddr, 127 );
szBiosData[127] = 0;
int iLen = lstrlen((LPCWSTR)szBiosData);
if( iLen > 0 && iLen < 128 )
{
// Example: Phoenix "NITELT0.86B.0044.P11.9910111055"
if( szBiosData[7] == '.' && szBiosData[11] == '.' )
{
BYTE* p = szBiosData;
while( * p )
{
if( * p < ' ' || * p >= 127 )
{
break;
}
++ p;
}
if( * p == 0 )
{
* ppBiosAddr = pBiosAddr;
return ( UINT )iLen;
}
}
}
}
return 0;
}
// 网卡 MAC 地址，注意: MAC 地址是可以在注册表中修改的
BOOL GetMac(LPBYTE lpInfo, UINT iSize, UINT &iCount)
{
UINT uErrorCode = 0;
IP_ADAPTER_INFO iai;
ULONG uSize = 0;
iCount = 0;
DWORD dwResult = GetAdaptersInfo(&iai, &uSize);
if (dwResult == ERROR_BUFFER_OVERFLOW)
{
IP_ADAPTER_INFO* piai = (IP_ADAPTER_INFO*)HeapAlloc(GetProcessHeap(), 0, uSize);
if (piai != NULL)
{
dwResult = GetAdaptersInfo(piai, &uSize);
if (ERROR_SUCCESS == dwResult)
{
IP_ADAPTER_INFO* piai2 = piai;
while (piai2 != NULL && (iCount + piai2->AddressLength) < iSize)
{
CopyMemory(lpInfo + iCount, piai2->Address, piai2->AddressLength );
iCount += piai2->AddressLength;
piai2 = piai2->Next;
}
}
else
{
uErrorCode = 0xF0000000U + dwResult;
}
VERIFY(HeapFree(GetProcessHeap(), 0, piai));
}
else
{
return FALSE;
}
}
else
{
uErrorCode = 0xE0000000U + dwResult;
}
if (uErrorCode != 0U)
{
return FALSE;
}
return TRUE;
}
// 硬盘序列号，注意：有的硬盘没有序列号
BOOL GetDiskSerialNum(LPBYTE lpInfo, UINT iSize, UINT &iCount)
{
iCount = 0;
OSVERSIONINFO ovi = { 0 };
ovi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&ovi);
if (ovi.dwPlatformId != VER_PLATFORM_WIN32_NT)
{
// Only Windows 2000, Windows XP, Windows Server 2003...
return FALSE;
}
else
{
if (!WinNTHDSerialNumASPhysicalRead(lpInfo, &iCount, iSize))
{
return WinNTHDSerialNumAsScsiRead(lpInfo, &iCount, iSize);
}
return TRUE;
}
return FALSE;
}
BOOL GetCPUId(LPBYTE lpInfo, UINT iSize, UINT &iCount)
{
BOOL bException = FALSE;
BYTE szCpu[16] = { 0 };
UINT uCpuID = 0U;
iCount = 0;
__try
{
_asm
{
mov eax, 0
cpuid
mov dword ptr szCpu[0], ebx
mov dword ptr szCpu[4], edx
mov dword ptr szCpu[8], ecx
mov eax, 1
cpuid
mov uCpuID, edx
}
}
__except( EXCEPTION_EXECUTE_HANDLER )
{
bException = TRUE;
}
if (!bException)
{
CopyMemory(lpInfo + iCount, &uCpuID, sizeof(UINT));
iCount += sizeof(UINT);
uCpuID = (UINT)strlen((char *)szCpu);
CopyMemory(lpInfo + iCount, szCpu, uCpuID);
iCount += uCpuID;
return TRUE;
}
return FALSE;
}
BOOL GetBOISId(LPBYTE lpInfo, UINT iSize, UINT &iCount)
{
SIZE_T ssize;
iCount = 0;
LARGE_INTEGER so;
so.LowPart=0x000f0000;
so.HighPart=0x00000000;
ssize=0xffff;
wchar_t strPH[30] = _T("\\device\\physicalmemory");
DWORD ba=0;
UNICODE_STRING struniph;
struniph.Buffer = strPH;
struniph.Length = 0x2c;
struniph.MaximUMLength = 0x2e;
OBJECT_ATTRIBUTES obj_ar;
obj_ar.Attributes =64;
obj_ar.Length =24;
obj_ar.ObjectName=&struniph;
obj_ar.RootDirectory=0;
obj_ar.SecurityDescriptor=0;
obj_ar.SecurityQualityOfService =0;
HMODULE hinstLib = LoadLibrary(_T("ntdll.dll"));
ZWOS ZWopenS = (ZWOS)GetProcAddress(hinstLib, "ZwOpenSection");
ZWMV ZWmapV = (ZWMV)GetProcAddress(hinstLib, "ZwMapViewOfSection");
ZWUMV ZWunmapV = (ZWUMV)GetProcAddress(hinstLib, "ZwUnmapViewOfSection");
//调用函数，对物理内存进行映射
HANDLE hSection;
if (0 == ZWopenS(&hSection,4,&obj_ar) &&
0 == ZWmapV(
( HANDLE )hSection, //打开Section时得到的句柄
( HANDLE )0xFFFFFFFF, //将要映射进程的句柄，
&ba, //映射的基址
0,
0xFFFF, //分配的大小
&so, //物理内存的地址
&ssize, //指向读取内存块大小的指针
1, //子进程的可继承性设定
0, //分配类型
2 //保护类型
) )
//执行后会在当前进程的空间开辟一段64k的空间，并把f000:0000到f000:ffff处的内容映射到这里
//映射的基址由ba返回,如果映射不再有用,应该用ZwUnmapViewOfSection断开映射
{
BYTE* pBiosSerial = (BYTE*)ba;
UINT uBiosSerialLen = FindAwardBios(&pBiosSerial);
if (uBiosSerialLen == 0U)
{
uBiosSerialLen = FindAmiBios(&pBiosSerial);
if (uBiosSerialLen == 0U)
{
uBiosSerialLen = FindPhoenixBios(&pBiosSerial);
}
}
if (uBiosSerialLen != 0U)
{
CopyMemory(lpInfo + iCount, pBiosSerial, uBiosSerialLen);
iCount += uBiosSerialLen;
}
ZWunmapV((HANDLE)0xFFFFFFFF, ( void* )ba);
return TRUE;
}
return FALSE;
}
BOOL Get()
{
BYTE szSystemInfo[4096]; // 在程序执行完毕后，此处存储取得的系统特征码
UINT uSystemInfoLen = 0; // 在程序执行完毕后，此处存储取得的系统特征码的长度
return TRUE;
}
/****************************************************************
This is a sample routine of base64 algorithm.The goal is to
illustrate principles,so some details may be ignored.
Author email:zhangwu2003@163.com
*****************************************************************/
char * ch64="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned char *Base64Encode(unsigned char *src,int srclen)
{
int n,buflen,i,j;
int pading=0;
unsigned char *buf;
static unsigned char *dst;
buf=src;
buflen=n=srclen;
if(n%3!=0) /* pad with '=' by using a temp buffer */
{
pading=1;
buflen=n+3-n%3;
buf=(unsigned char *)malloc(buflen+1);
memset(buf,0,buflen+1);
memcpy(buf,src,n);
for(i=0;i<3-n%3;i++)
buf[n+i]='=';
}
dst=(unsigned char *)malloc(buflen*4/3+1);
memset(dst,0,buflen*4/3+1);
for(i=0,j=0;i<buflen;i+=3,j+=4)
{
dst[j]=(buf[i]&0xFC)>>2;
dst[j+1]=((buf[i]&0x03)<<4) + ((buf[i+1]&0xF0)>>4);
dst[j+2]=((buf[i+1]&0x0F)<<2) + ((buf[i+2]&0xC0)>>6);
dst[j+3]=buf[i+2]&0x3F;
}
for(i=0;i<buflen*4/3;i++) /* map 6 bit value to base64 ASCII character */
dst[i]=ch64[dst[i]];
if(pading)
free(buf);
return dst;
}
unsigned char *Base64Decode(unsigned char *src)
{
int n,i,j;
unsigned char *p;
static unsigned char *dst;
n=(int)strlen((char *)src);
for(i=0;i<n;i++) /* map base64 ASCII character to 6 bit value */
{
p=(unsigned char *)strchr(ch64,src[i]);
if(!p)
break;
src[i] = p-(unsigned char *)ch64;
}
dst=(unsigned char *)malloc(n*3/4+1);
memset(dst,0,n*3/4+1);
for(i=0,j=0;i<n;i+=4,j+=3)
{
dst[j]=(src[i]<<2) + ((src[i+1]&0x30)>>4);
dst[j+1]=((src[i+1]&0x0F)<<4) + ((src[i+2]&0x3C)>>2);
dst[j+2]=((src[i+2]&0x03)<<6) + src[i+3];
}
return dst;
}
