MD5 Class Reference

#include <md5.h>

Collaboration diagram for MD5:

[legend]List of all members.

---

Detailed Description

MD5 Support allows checksums to be computed for images, determing if they have changed since the album was saved out, and if so need to be loaded and rescaled.

Definition at line 71 of file md5.h.

Public Member Functions
	MD5 ()
void	update (unsigned char *input, unsigned int input_length)
void	update (std::istream &stream)
void	update (FILE *file)
void	update (std::ifstream &stream)
void	finalize ()
	MD5 (unsigned char *string)
	MD5 (std::istream &stream)
	MD5 (FILE *file)
	MD5 (std::ifstream &stream)
unsigned char *	raw_digest ()
QString	hex_digest ()
Private Types
typedef unsigned int	uint4
typedef unsigned short int	uint2
typedef unsigned char	uint1
Private Member Functions
void	init ()
void	transform (uint1 *buffer)
Static Private Member Functions
void	encode (uint1 *dest, uint4 *src, uint4 length)
void	decode (uint4 *dest, uint1 *src, uint4 length)
void	memcpy (uint1 *dest, uint1 *src, uint4 length)
void	memset (uint1 *start, uint1 val, uint4 length)
uint4	rotate_left (uint4 x, uint4 n)
uint4	F (uint4 x, uint4 y, uint4 z)
uint4	G (uint4 x, uint4 y, uint4 z)
uint4	H (uint4 x, uint4 y, uint4 z)
uint4	I (uint4 x, uint4 y, uint4 z)
void	FF (uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
void	GG (uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
void	HH (uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
void	II (uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
Private Attributes
uint4	state [4]
uint4	count [2]
uint1	buffer [64]
uint1	digest [16]
uint1	finalized

---

Member Typedef Documentation

typedef unsigned char MD5::uint1 [private]

Definition at line 99 of file md5.h. Referenced by decode(), encode(), finalize(), memcpy(), memset(), and raw_digest().

typedef unsigned short int MD5::uint2 [private]

Definition at line 98 of file md5.h.

typedef unsigned int MD5::uint4 [private]

Definition at line 97 of file md5.h. Referenced by decode(), encode(), F(), FF(), finalize(), G(), GG(), H(), HH(), I(), II(), memcpy(), memset(), and rotate_left().

---

Constructor & Destructor Documentation

MD5::MD5 (   )

Definition at line 67 of file md5.cpp. References init(). { init(); }

MD5::MD5 (  unsigned char *  string  )

MD5::MD5 (  std::istream &  stream  )

Definition at line 242 of file md5.cpp. References finalize(), init(), and update(). { init(); // must called by all constructors update (stream); finalize(); }

MD5::MD5 (  FILE *  file  )

Definition at line 232 of file md5.cpp. References finalize(), init(), and update(). { init(); // must be called be all constructors update(file); finalize (); }

MD5::MD5 (  std::ifstream &  stream  )

Definition at line 251 of file md5.cpp. References finalize(), init(), and update(). { init(); // must called by all constructors update (stream); finalize(); }

---

Member Function Documentation

void MD5::decode (  uint4 *  dest, uint1 *  src, uint4  length )  [static, private]

Definition at line 454 of file md5.cpp. References uint1, and uint4. { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) | (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24); }

void MD5::encode (  uint1 *  dest, uint4 *  src, uint4  length )  [static, private]

Definition at line 437 of file md5.cpp. References uint1, and uint4. Referenced by finalize(). { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) { output[j] = (uint1) (input[i] & 0xff); output[j+1] = (uint1) ((input[i] >> 8) & 0xff); output[j+2] = (uint1) ((input[i] >> 16) & 0xff); output[j+3] = (uint1) ((input[i] >> 24) & 0xff); } }

unsigned int MD5::F (  uint4  x, uint4  y, uint4  z )  [inline, static, private]

Definition at line 500 of file md5.cpp. References uint4. Referenced by FF(). { return (x & y) | (~x & z); }

void MD5::FF (  uint4 &  a, uint4  b, uint4  c, uint4  d, uint4  x, uint4  s, uint4  ac )  [inline, static, private]

Definition at line 522 of file md5.cpp. References F(), rotate_left(), and uint4. { a += F(b, c, d) + x + ac; a = rotate_left (a, s) +b; }

void MD5::finalize (   )

Definition at line 193 of file md5.cpp. References buffer, count, digest, encode(), finalized, memset(), state, uint1, uint4, and update(). Referenced by MD5(). { unsigned char bits[8]; unsigned int index, padLen; static uint1 PADDING[64]={ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; if (finalized){ std::cerr << "MD5::finalize: Already finalized this digest!" << std::endl; return; } // Save number of bits encode (bits, count, 8); // Pad out to 56 mod 64. index = (uint4) ((count[0] >> 3) & 0x3f); padLen = (index < 56) ? (56 - index) : (120 - index); update (PADDING, padLen); // Append length (before padding) update (bits, 8); // Store state in digest encode (digest, state, 16); // Zeroize sensitive information memset (buffer, 0, sizeof(*buffer)); finalized=1; }

unsigned int MD5::G (  uint4  x, uint4  y, uint4  z )  [inline, static, private]

Definition at line 504 of file md5.cpp. References uint4. Referenced by GG(). { return (x & z) | (y & ~z); }

void MD5::GG (  uint4 &  a, uint4  b, uint4  c, uint4  d, uint4  x, uint4  s, uint4  ac )  [inline, static, private]

Definition at line 528 of file md5.cpp. References G(), rotate_left(), and uint4. { a += G(b, c, d) + x + ac; a = rotate_left (a, s) +b; }

unsigned int MD5::H (  uint4  x, uint4  y, uint4  z )  [inline, static, private]

Definition at line 508 of file md5.cpp. References uint4. Referenced by HH(). { return x ^ y ^ z; }

QString MD5::hex_digest (   )

Definition at line 276 of file md5.cpp. References digest, and finalized. Referenced by filesMatch(), and getMD5(). { int i; char *s= new char[33]; if (!finalized){ std::cerr << "MD5::hex_digest: Can't get digest if you haven't "<< "finalized the digest!" << std::endl; return ""; } for (i=0; i<16; i++) sprintf(s+i*2, "%02x", digest[i]); s[32]='\0'; QString result(s); delete s; return result; }

void MD5::HH (  uint4 &  a, uint4  b, uint4  c, uint4  d, uint4  x, uint4  s, uint4  ac )  [inline, static, private]

Definition at line 534 of file md5.cpp. References H(), rotate_left(), and uint4. { a += H(b, c, d) + x + ac; a = rotate_left (a, s) +b; }

unsigned int MD5::I (  uint4  x, uint4  y, uint4  z )  [inline, static, private]

Definition at line 512 of file md5.cpp. References uint4. Referenced by II(). { return y ^ (x | ~z); }

void MD5::II (  uint4 &  a, uint4  b, uint4  c, uint4  d, uint4  x, uint4  s, uint4  ac )  [inline, static, private]

Definition at line 540 of file md5.cpp. References I(), rotate_left(), and uint4. { a += I(b, c, d) + x + ac; a = rotate_left (a, s) +b; }

void MD5::init (   )  [private]

Definition at line 302 of file md5.cpp. References count, finalized, and state. Referenced by MD5(). { finalized=0; // we just started! // Nothing counted, so count=0 count[0] = 0; count[1] = 0; // Load magic initialization constants. state[0] = 0x67452301; state[1] = 0xefcdab89; state[2] = 0x98badcfe; state[3] = 0x10325476; }

void MD5::memcpy (  uint1 *  dest, uint1 *  src, uint4  length )  [static, private]

Definition at line 468 of file md5.cpp. References uint1, and uint4. Referenced by raw_digest(). { unsigned int i; for (i = 0; i < len; i++) output[i] = input[i]; }

void MD5::memset (  uint1 *  start, uint1  val, uint4  length )  [static, private]

Definition at line 479 of file md5.cpp. References uint1, and uint4. Referenced by finalize(). { unsigned int i; for (i = 0; i < len; i++) output[i] = value; }

unsigned char * MD5::raw_digest (   )

Definition at line 260 of file md5.cpp. References digest, finalized, memcpy(), and uint1. { uint1 *s = new uint1[16]; if (!finalized){ std::cerr << "MD5::raw_digest: Can't get digest if you haven't "<< "finalized the digest!" << std::endl; return ( (unsigned char*) ""); } memcpy(s, digest, 16); return s; }

unsigned int MD5::rotate_left (  uint4  x, uint4  n )  [inline, static, private]

Definition at line 491 of file md5.cpp. References uint4. Referenced by FF(), GG(), HH(), and II(). { return (x << n) | (x >> (32-n)) ; }

void MD5::transform (  uint1 *  buffer  )  [private]

void MD5::update (  std::ifstream &  stream  )

Definition at line 171 of file md5.cpp. References buffer, and update(). { unsigned char buffer[1024]; int len; while (stream.good()){ stream.read((char*)buffer, 1024); // note that return value of read is unusable. len=stream.gcount(); update(buffer, len); } }

void MD5::update (  FILE *  file  )

Definition at line 124 of file md5.cpp. References buffer, and update(). { unsigned char buffer[1024]; int len; while (true) { len=fread(buffer, 1, 1024, file); if(!len) { break; } update(buffer, len); } fclose (file); }

void MD5::update (  std::istream &  stream  )

Definition at line 150 of file md5.cpp. References buffer, and update(). { unsigned char buffer[1024]; int len; while (stream.good()){ stream.read((char*)buffer, 1024); // note that return value of read is unusable. len=stream.gcount(); update(buffer, len); } }

void MD5::update (  unsigned char *  input, unsigned int  input_length )

Referenced by finalize(), MD5(), and update().

---

Member Data Documentation

uint1 MD5::buffer[64] [private]

Definition at line 104 of file md5.h. Referenced by finalize(), and update().

uint4 MD5::count[2] [private]

Definition at line 103 of file md5.h. Referenced by finalize(), and init().

uint1 MD5::digest[16] [private]

Definition at line 105 of file md5.h. Referenced by finalize(), hex_digest(), and raw_digest().

uint1 MD5::finalized [private]

Definition at line 106 of file md5.h. Referenced by finalize(), hex_digest(), init(), and raw_digest().

uint4 MD5::state[4] [private]

Definition at line 102 of file md5.h. Referenced by finalize(), and init().

---

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

• md5.h
• md5.cpp

---