XrdCksCalcmd5 Class Reference

#include <XrdCksCalcmd5.hh>

Inheritance diagram for XrdCksCalcmd5:

Collaboration diagram for XrdCksCalcmd5:

Classes
union	MD5Context.__unnamed0__
union	MD5Context.__unnamed1__

Public Member Functions
	XrdCksCalcmd5 ()
	~XrdCksCalcmd5 ()
char *	Current ()
char *	Final ()
void	Init ()
XrdCksCalc *	New ()
const char *	Type (int &csSz)
void	Update (const char *Buff, int BLen)
Public Member Functions inherited from XrdCksCalc
	XrdCksCalc ()
	Constructor.
virtual	~XrdCksCalc ()
	Destructor.
virtual char *	Calc (const char *Buff, int BLen)
virtual bool	Combinable ()
virtual const char *	Combine (const char *Cksum, int DLen)
virtual const char *	Combine (const char *Cksum1, const char *Cksum2, int DLen)
virtual void	Recycle ()
	Recycle the checksum object as it is no longer needed. A default is given.

Detailed Description

Definition at line 37 of file XrdCksCalcmd5.hh.

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Class Documentation

XrdCksCalcmd5::MD5Context.__unnamed0__

union XrdCksCalcmd5::MD5Context.__unnamed0__

Definition at line 66 of file XrdCksCalcmd5.hh.

Collaboration diagram for XrdCksCalcmd5::MD5Context.__unnamed0__:

Class Members
long long	b64
unsigned int	bits[2]

XrdCksCalcmd5::MD5Context.__unnamed1__

union XrdCksCalcmd5::MD5Context.__unnamed1__

Definition at line 69 of file XrdCksCalcmd5.hh.

Collaboration diagram for XrdCksCalcmd5::MD5Context.__unnamed1__:

Class Members
long long	i64[8]
unsigned char	in[64]

Constructor & Destructor Documentation

XrdCksCalcmd5()

XrdCksCalcmd5::XrdCksCalcmd5 ( )

inline

Definition at line 59 of file XrdCksCalcmd5.hh.

{Init();}

References Init().

Referenced by New().

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~XrdCksCalcmd5()

XrdCksCalcmd5::~XrdCksCalcmd5 ( )

inline

Definition at line 60 of file XrdCksCalcmd5.hh.

{}

Member Function Documentation

Current()

char * XrdCksCalcmd5::Current ( )

inlinevirtual

Get the current binary checksum value (defaults to final). However, the final checksum result is not affected.

Returns

the checksum value in binary format. The pointer to the value becomes invalid once the associated object is deleted.

Reimplemented from XrdCksCalc.

Definition at line 41 of file XrdCksCalcmd5.hh.

                   {MD5Context saveCTX = myContext;
                    char *md5P = Final();
                    myContext = saveCTX;
                    return (char *)md5P;
                   }

References Final().

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Final()

char * XrdCksCalcmd5::Final ( )

virtual

Get the actual checksum in binary format.

Returns

the checksum value in binary format. The pointer to the value becomes invalid once the associated object is deleted.

Implements XrdCksCalc.

Definition at line 153 of file XrdCksCalcmd5.cc.

{
   unsigned count;
   unsigned char *p;
 
// Compute number of bytes mod 64
//
   count = (myContext.bits[0] >> 3) & 0x3F;
 
// Set the first char of padding to 0x80.  This is safe since there is
// always at least one byte free.
//
   p = myContext.in + count;
   *p++ = 0x80;
 
// Bytes of padding needed to make 64 bytes
//
   count = 64 - 1 - count;
 
// Pad out to 56 mod 64
//
   if (count < 8)  // Two lots of padding:  Pad the first block to 64 bytes
      {memset(p, 0, count);
       byteReverse(myContext.in, 16);
       MD5Transform(myContext.buf, (unsigned int *) myContext.in);
       memset(myContext.in, 0, 56);        // Now fill the next block with 56 bytes
      } else memset(p, 0, count - 8); // Else pad block to 56 bytes
 
   byteReverse(myContext.in, 14);
 
// Append length in bits and transform (original code in comments)
//
// ((unsigned int *) myContext.in)[14] = myContext.bits[0];
// ((unsigned int *) myContext.in)[15] = myContext.bits[1];
   myContext.i64[7] = myContext.b64;
 
   MD5Transform(myContext.buf, (unsigned int *) myContext.in);
   byteReverse((unsigned char *) myContext.buf, 4);
 
// Copy to a separate buffer and return ASCII value if so wanted
//
   memcpy(myDigest, myContext.buf, 16);
   return (char *)myDigest;
}

Referenced by Current().

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Init()

void XrdCksCalcmd5::Init ( )

virtual

Initializes data structures (must be called by constructor). This is always called to reuse the object for a new checksum.

Implements XrdCksCalc.

Definition at line 84 of file XrdCksCalcmd5.cc.

{
    myContext.buf[0]  = 0x67452301;
    myContext.buf[1]  = 0xefcdab89;
    myContext.buf[2]  = 0x98badcfe;
    myContext.buf[3]  = 0x10325476;
 
    myContext.bits[0] = 0;
    myContext.bits[1] = 0;
}

Referenced by XrdCksCalcmd5().

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New()

XrdCksCalc * XrdCksCalcmd5::New ( )

inlinevirtual

Get a new instance of the underlying checksum calculation object.

Returns

the checksum calculation object.

Implements XrdCksCalc.

Definition at line 50 of file XrdCksCalcmd5.hh.

{return (XrdCksCalc *)new XrdCksCalcmd5;}

References XrdCksCalc::XrdCksCalc(), and XrdCksCalcmd5().

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Type()

const char * XrdCksCalcmd5::Type ( int & csSize )

inlinevirtual

Get the checksum object algorithm name and the number bytes (i.e. size) required for the checksum value.

Parameters

csSize

-> Parameter to hold the size of the checksum value.

Returns

the checksum algorithm's name. The name persists event after the checksum object is deleted.

Implements XrdCksCalc.

Definition at line 57 of file XrdCksCalcmd5.hh.

{csSz = sizeof(myDigest); return "md5";}

Referenced by XrdCksManager::Init().

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Update()

void XrdCksCalcmd5::Update ( const char * Buff, int BLen )

inlinevirtual

Compute a running checksum. This method may be called repeatedly for data segments; with Final() returning the full checksum.

Parameters

Buff	-> Data to be checksummed.
BLen	-> Length of the data in Buff.

Implements XrdCksCalc.

Definition at line 54 of file XrdCksCalcmd5.hh.

                  {MD5Update((unsigned char *)Buff,(unsigned)BLen);}

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

• XrdCksCalcmd5.hh
• XrdCksCalcmd5.cc