IccMD5.h File Reference

#include "IccProfLibConf.h"

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Data Structures
struct	MD5_CTX

Typedefs
typedef unsigned char *	POINTER
typedef unsigned short int	UINT2
typedef ICCUINT32	UINT4

Functions
void ICCPROFLIB_API	icMD5Final (unsigned char *, MD5_CTX *)
void ICCPROFLIB_API	icMD5Init (MD5_CTX *)
void ICCPROFLIB_API	icMD5Update (MD5_CTX *, unsigned char *, unsigned int)

Detailed Description

IccMD5.H - header file for IccMD5.cpp

Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved.

License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function.

License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work.

RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind.

These notices must be retained in any copies of any part of this documentation and/or software.

Definition in file IccMD5.h.

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Data Structure Documentation

MD5_CTX

struct MD5_CTX

MD5 context.

Data Fields
unsigned char	buffer[64]
UINT4	count[2]
UINT4	state[4]

Typedef Documentation

POINTER

typedef unsigned char* POINTER

POINTER defines a generic pointer type

UINT2

typedef unsigned short int UINT2

UINT2 defines a two byte word

UINT4

typedef ICCUINT32 UINT4

UINT4 defines a four byte word

Function Documentation

icMD5Final()

void ICCPROFLIB_API icMD5Final	(	unsigned char *	digest,
		MD5_CTX *	context
	)

MD5 finalization. Ends an MD5 message-digest operation, writing the the message digest and zeroizing the context.

{
  unsigned char bits[8];
  unsigned int index, padLen;
 
  /* Save number of bits */
  Encode (bits, context->count, 8);
 
  /* Pad out to 56 mod 64.
*/
  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  icMD5Update (context, PADDING, padLen);
 
  /* Append length (before padding) */
  icMD5Update (context, bits, 8);
 
 
  /* Store state in digest */
  Encode (digest, context->state, 16);
 
  /* Zeroize sensitive information.
*/
  memset((POINTER)context, 0, sizeof (*context));
}

References MD5_CTX::count, Encode(), icMD5Update(), PADDING, and MD5_CTX::state.

Referenced by CalcProfileID().

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icMD5Init()

void ICCPROFLIB_API icMD5Init

(

MD5_CTX *

context

)

MD5 initialization. Begins an MD5 operation, writing a new context.

{
  context->count[0] = context->count[1] = 0;
  /* Load magic initialization constants.
*/
  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

References MD5_CTX::count, and MD5_CTX::state.

Referenced by CalcProfileID().

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icMD5Update()

void ICCPROFLIB_API icMD5Update	(	MD5_CTX *	context,
		unsigned char *	input,
		unsigned int	inputLen
	)

MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context.

{
  unsigned int i, index, partLen;
 
  /* Compute number of bytes mod 64 */
  index = (unsigned int)((context->count[0] >> 3) & 0x3F);
 
  /* Update number of bits */
  if ((context->count[0] += ((UINT4)inputLen << 3))
    < ((UINT4)inputLen << 3))
    context->count[1]++;
  context->count[1] += ((UINT4)inputLen >> 29);
 
  partLen = 64 - index;
 
  /* Transform as many times as possible.
  */
  if (inputLen >= partLen) {
    memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
    MD5Transform (context->state, context->buffer);
 
    for (i = partLen; i + 63 < inputLen; i += 64)
      MD5Transform (context->state, &input[i]);
 
    index = 0;
  }
  else
    i = 0;
 
  /* Buffer remaining input */
  memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);
}

References MD5_CTX::buffer, MD5_CTX::count, MD5Transform(), and MD5_CTX::state.

Referenced by CalcProfileID(), and icMD5Final().

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