Codice:
#include <windows.h>
#include <malloc.h>
#include "md5.h"
static void __Init();
static void __Update(UCHAR *chInput, UINT nInputLen);
static void __Finalize();
static void __Transform(UCHAR *block);
static void __Encode(UCHAR *dest, UINT *src, UINT nLength);
static void __Decode(UINT *dest, UCHAR *src, UINT nLength);
static inline UINT rotate_left(UINT x, UINT n){ return ((x << n) | (x >> (32 - n))); }
static inline UINT F(UINT x, UINT y, UINT z){ return ((x & y) | (~x & z)); }
static inline UINT G(UINT x, UINT y, UINT z){ return ((x & z) | (y & ~z)); }
static inline UINT H(UINT x, UINT y, UINT z){ return (x ^ y ^ z); }
static inline UINT I(UINT x, UINT y, UINT z){ return (y ^ (x | ~z)); }
static inline void FF(UINT& a, UINT b, UINT c, UINT d, UINT x, UINT s, UINT ac){ a += F(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
static inline void GG(UINT& a, UINT b, UINT c, UINT d, UINT x, UINT s, UINT ac){ a += G(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
static inline void HH(UINT& a, UINT b, UINT c, UINT d, UINT x, UINT s, UINT ac){ a += H(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
static inline void II(UINT& a, UINT b, UINT c, UINT d, UINT x, UINT s, UINT ac){ a += I(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
static UINT m_State[4];
static UINT m_Count[2];
static UCHAR m_Buffer[64];
static UCHAR m_Digest[16];
static UCHAR m_Finalized;
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
};
#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
// PrintMD5: Converts a completed md5 digest into a char * string.
char *__PrintMD5(UCHAR md5Digest[16])
{
char chBuffer[256];
char chEach[10];
int nCount;
memset(chBuffer, 0, sizeof(chBuffer));
memset(chEach, 0, sizeof(chEach));
for (nCount = 0; nCount < 16; nCount++)
{
wsprintf(chEach, "%02X", md5Digest[nCount]);
strncat(chBuffer, chEach, sizeof(chEach));
}
return strdup(chBuffer);
}
// MD5String: Performs the MD5 algorithm on a char * string, returning
// the results as a char *.
char *__MD5String(char *szString, int dwSize)
{
__Init();
__Update((UCHAR *)szString, (UINT)dwSize);
__Finalize();
return __PrintMD5(m_Digest);
}
// md5::Init
// Initializes a new context.
static void __Init()
{
memset(m_Count, 0, 2 * sizeof(UINT));
m_State[0] = 0x67452301;
m_State[1] = 0xefcdab89;
m_State[2] = 0x98badcfe;
m_State[3] = 0x10325476;
}
// md5::Update
// MD5 block update operation. Continues an MD5 message-digest
// operation, processing another message block, and updating the
// context.
static void __Update(UCHAR *chInput, UINT nInputLen)
{
UINT i, index, partLen;
// Compute number of bytes mod 64
index = (UINT)((m_Count[0] >> 3) & 0x3F);
// Update number of bits
if ((m_Count[0] += (nInputLen << 3)) < (nInputLen << 3))
{
m_Count[1]++;
}
m_Count[1] += (nInputLen >> 29);
partLen = 64 - index;
// Transform as many times as possible.
if (nInputLen >= partLen)
{
memcpy(&m_Buffer[index], chInput, partLen);
__Transform(m_Buffer);
for (i = partLen; i + 63 < nInputLen; i += 64)
{
__Transform(&chInput[i]);
}
index = 0;
}
else
{
i = 0;
}
// Buffer remaining input
memcpy(&m_Buffer[index], &chInput[i], nInputLen - i);
}
// md5::Finalize
// MD5 finalization. Ends an MD5 message-digest operation, writing
// the message digest and zeroizing the context.
static void __Finalize()
{
UCHAR bits[8];
UINT index, padLen;
// Save number of bits
__Encode(bits, m_Count, 8);
// Pad out to 56 mod 64
index = (UINT)((m_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(m_Digest, m_State, 16);
memset(m_Count, 0, 2 * sizeof(UINT));
memset(m_State, 0, 4 * sizeof(UINT));
memset(m_Buffer,0, 64 * sizeof(UCHAR));
}
// md5::Transform
// MD5 basic transformation. Transforms state based on block.
static void __Transform(UCHAR *block)
{
UINT a = m_State[0];
UINT b = m_State[1];
UINT c = m_State[2];
UINT d = m_State[3];
UINT x[16];
__Decode(x, block, 64);
// Round 1
FF (a, b, c, d, x[ 0], S11, 0xd76aa478);
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756);
FF (c, d, a, b, x[ 2], S13, 0x242070db);
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee);
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf);
FF (d, a, b, c, x[ 5], S12, 0x4787c62a);
FF (c, d, a, b, x[ 6], S13, 0xa8304613);
FF (b, c, d, a, x[ 7], S14, 0xfd469501);
FF (a, b, c, d, x[ 8], S11, 0x698098d8);
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af);
FF (c, d, a, b, x[10], S13, 0xffff5bb1);
FF (b, c, d, a, x[11], S14, 0x895cd7be);
FF (a, b, c, d, x[12], S11, 0x6b901122);
FF (d, a, b, c, x[13], S12, 0xfd987193);
FF (c, d, a, b, x[14], S13, 0xa679438e);
FF (b, c, d, a, x[15], S14, 0x49b40821);
// Round 2
GG (a, b, c, d, x[ 1], S21, 0xf61e2562);
GG (d, a, b, c, x[ 6], S22, 0xc040b340);
GG (c, d, a, b, x[11], S23, 0x265e5a51);
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa);
GG (a, b, c, d, x[ 5], S21, 0xd62f105d);
GG (d, a, b, c, x[10], S22, 0x2441453);
GG (c, d, a, b, x[15], S23, 0xd8a1e681);
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8);
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6);
GG (d, a, b, c, x[14], S22, 0xc33707d6);
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87);
GG (b, c, d, a, x[ 8], S24, 0x455a14ed);
GG (a, b, c, d, x[13], S21, 0xa9e3e905);
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8);
GG (c, d, a, b, x[ 7], S23, 0x676f02d9);
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a);
// Round 3
HH (a, b, c, d, x[ 5], S31, 0xfffa3942);
HH (d, a, b, c, x[ 8], S32, 0x8771f681);
HH (c, d, a, b, x[11], S33, 0x6d9d6122);
HH (b, c, d, a, x[14], S34, 0xfde5380c);
HH (a, b, c, d, x[ 1], S31, 0xa4beea44);
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9);
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60);
HH (b, c, d, a, x[10], S34, 0xbebfbc70);
HH (a, b, c, d, x[13], S31, 0x289b7ec6);
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa);
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085);
HH (b, c, d, a, x[ 6], S34, 0x4881d05);
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039);
HH (d, a, b, c, x[12], S32, 0xe6db99e5);
HH (c, d, a, b, x[15], S33, 0x1fa27cf8);
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);
// Round 4
II (a, b, c, d, x[ 0], S41, 0xf4292244);
II (d, a, b, c, x[ 7], S42, 0x432aff97);
II (c, d, a, b, x[14], S43, 0xab9423a7);
II (b, c, d, a, x[ 5], S44, 0xfc93a039);
II (a, b, c, d, x[12], S41, 0x655b59c3);
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92);
II (c, d, a, b, x[10], S43, 0xffeff47d);
II (b, c, d, a, x[ 1], S44, 0x85845dd1);
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f);
II (d, a, b, c, x[15], S42, 0xfe2ce6e0);
II (c, d, a, b, x[ 6], S43, 0xa3014314);
II (b, c, d, a, x[13], S44, 0x4e0811a1);
II (a, b, c, d, x[ 4], S41, 0xf7537e82);
II (d, a, b, c, x[11], S42, 0xbd3af235);
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb);
II (b, c, d, a, x[ 9], S44, 0xeb86d391);
m_State[0] += a;
m_State[1] += b;
m_State[2] += c;
m_State[3] += d;
memset(x, 0, sizeof(x));
}
// md5::Encode
// Encodes input (UINT) into output (UCHAR). Assumes nLength is
// a multiple of 4.
static void __Encode(UCHAR *dest, UINT *src, UINT nLength)
{
UINT i;
UINT j;
// assert(nLength % 4 == 0);
for (i = 0, j = 0; j < nLength; i++, j += 4)
{
dest[j] = (UCHAR)(src[i] & 0xff);
dest[j + 1] = (UCHAR)((src[i] >> 8) & 0xff);
dest[j + 2] = (UCHAR)((src[i] >> 16) & 0xff);
dest[j + 3] = (UCHAR)((src[i] >> 24) & 0xff);
}
}
// md5::Decode
// Decodes input (UCHAR) into output (UINT). Assumes nLength is
// a multiple of 4.
static void __Decode(UINT *dest, UCHAR *src, UINT nLength)
{
UINT i;
UINT j;
// assert(nLength % 4 == 0);
for (i = 0, j = 0; j < nLength; i++, j += 4)
{
dest[i] = ((UINT)src[j]) | (((UINT)src[j + 1]) << 8) | (((UINT)src[j + 2]) << 16) | (((UINT)src[j + 3]) << 24);
}
}
MD5 Module
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