MD5.cpp

Go to the documentation of this file.

#include <dcl/Config.h>
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>     // memset
#include <wchar.h>      // swprintf
 
#include <dcl/Object.h>
 
#if __DCL_HAVE_ALLOC_DEBUG
#undef __DCL_ALLOC_LEVEL
#define __DCL_ALLOC_LEVEL   __DCL_ALLOC_INTERNAL
#endif
 
#include <dcl/MD5.h>
 
#ifdef UINT2
#undef UINT2
#endif
 
#ifdef UINT4
#undef UINT4
#endif
 
#ifdef POINTER
#undef POINTER
#endif
 
typedef unsigned short int UINT2;
typedef unsigned long int UINT4;
typedef unsigned char* POINTER;
 
// md5.h
 
/* MD5 context. */
typedef struct {
  UINT4 state[4];                                   /* state (ABCD) */
  UINT4 count[2];        /* number of bits, modulo 2^64 (lsb first) */
  unsigned char buffer[64];                         /* input buffer */
} MD5_CTX;
 
//void MD5Init(MD5_CTX *);
//void MD5Update(MD5_CTX *, unsigned char *, size_t);
//void MD5Final(unsigned char [16], MD5_CTX *);
 
static void MD5Init(MD5_CTX *);
static void MD5Update(MD5_CTX *, const unsigned char *, size_t);
static void MD5Final(unsigned char [16], MD5_CTX *);
 
#if __DCL_HAVE_THIS_FILE__
#undef __THIS_FILE__
static const char_t __THIS_FILE__[] = __T("dcl/MD5.cpp");
#endif
 
__DCL_BEGIN_NAMESPACE
 
MD5::MD5()
{
    __context = malloc(sizeof(MD5_CTX));
    __DCL_ASSERT(__context != NULL);
 
    MD5Init((MD5_CTX*)__context);
}
 
MD5::~MD5()
{
    free(__context);
}
 
void MD5::update(const void* _p, size_t _n)
{
    MD5Update((MD5_CTX*)__context, (const unsigned char*)_p, _n);
}
 
void MD5::final(byte_t digest[16])
{
    MD5Final(digest, (MD5_CTX*)__context);
}
 
String MD5::final()
{
    byte_t digest[16];
    final(digest);
 
    return String::toHexString((const char*) digest, sizeof(digest), (size_t)-1, false);
}
 
// static
String MD5::final(const String& _s)
{
    return MD5::final(_s.data(), _s.length() * sizeof(wchar_t));
}
 
String MD5::final(const ByteString& _s)
{
    return MD5::final(_s.data(), _s.length() * sizeof(char));
}
 
String MD5::final(const void* _p, size_t _n)
{
    MD5 m;
    m.update(_p, _n);
    return m.final();
}
    
__DCL_END_NAMESPACE
 
 
// The remaining code is the reference MD5 code(md5c.c) from rfc1321
 
/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
 */
/* 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.
 */
 
// md5c.c
/* Constants for MD5Transform routine.
 */
 
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
 
static void MD5Transform(UINT4 state[4], const unsigned char block[64]);
static void Encode(unsigned char* output, UINT4* input, size_t len);
static void Decode(UINT4* output, const unsigned char* input, size_t len);
 
/*
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, size_t));
static void MD5_memset PROTO_LIST ((POINTER, int, size_t));
*/
 
static unsigned char 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
};
 
/* F, G, H and I are basic MD5 functions.
 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
 
/* ROTATE_LEFT rotates x left n bits. */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
 
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation. */
#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
 
/* MD5 initialization. Begins an MD5 operation, writing a new context. */
static void MD5Init(MD5_CTX *context)        /* 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;
}
 
/* MD5 block update operation. Continues an MD5 message-digest
  operation, processing another message block, and updating the
  context. */
//void MD5Update(MD5_CTX* context, unsigned char* input, size_t inputLen)
static void MD5Update(MD5_CTX* context, const unsigned char* input, size_t inputLen)
 
//MD5_CTX *context;                                        /* context */
//unsigned char *input;                                /* input block */
//size_t inputLen;                     /* length of input block */
{
    size_t i, index, partLen;
 
    /* Compute number of bytes mod 64 */
    index = (size_t)((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) 
    {
        //MD5_memcpy
        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 */
    //MD5_memcpy
    memcpy
        ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
}
 
/* MD5 finalization. Ends an MD5 message-digest operation, writing the
  the message digest and zeroizing the context. */
 
//void MD5Final (digest, context)
//unsigned char digest[16];                         /* message digest */
//MD5_CTX *context;                                       /* context */
static void MD5Final(unsigned char digest[16], MD5_CTX* context)
{
  unsigned char bits[8];
  size_t index, padLen;
 
  /* Save number of bits */
  Encode (bits, context->count, 8);
 
  /* Pad out to 56 mod 64.*/
  index = (size_t)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update (context, PADDING, padLen);
 
  /* Append length (before padding) */
  MD5Update (context, bits, 8);
 
  /* Store state in digest */
  Encode (digest, context->state, 16);
 
  /* Zeroize sensitive information. */
//  MD5_memset 
  memset((POINTER)context, 0, sizeof (*context));
}
 
/* MD5 basic transformation. Transforms state based on block. */
//static void MD5Transform (state, block)
//UINT4 state[4];
//unsigned char block[64];
//static void MD5Transform(UINT4 state[4], unsigned char block[64])
static void MD5Transform(UINT4 state[4], const unsigned char block[64])
{
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
 
  Decode (x, block, 64);
 
  /* Round 1 */
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
 
 /* Round 2 */
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
 
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
 
  /* Round 3 */
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
 
  /* Round 4 */
  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
 
  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;
 
  /* Zeroize sensitive information.*/
//  MD5_memset 
  memset((POINTER)x, 0, sizeof (x));
}
 
/* Encodes input (UINT4) into output (unsigned char). Assumes len is
  a multiple of 4. */
//static void Encode (output, input, len)
//unsigned char *output;
//UINT4 *input;
//size_t len;
static void Encode(unsigned char* output, UINT4* input, size_t len)
{
    size_t i, j;
 
    for (i = 0, j = 0; j < len; i++, j += 4) 
    {
        output[j] = (unsigned char)(input[i] & 0xff);
        output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
        output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
        output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
    }
}
 
/* Decodes input (unsigned char) into output (UINT4). Assumes len is
  a multiple of 4. */
//static void Decode (output, input, len)
//UINT4 *output;
//unsigned char *input;
//size_t len;
static void Decode(UINT4* output, const unsigned char* input, size_t len)
{
  size_t 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);
}
 
/* Note: Replace "for loop" with standard memcpy if possible.
 */
/*
static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
size_t len;
{
  size_t i;
 
  for (i = 0; i < len; i++)
 
 output[i] = input[i];
}
*/
/* Note: Replace "for loop" with standard memset if possible.
 */
/*
static void MD5_memset (output, value, len)
POINTER output;
int value;
size_t len;
{
  size_t i;
 
  for (i = 0; i < len; i++)
 ((char *)output)[i] = (char)value;
}
*/