md5加密算法C++程序

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#include "global.h"
#include "md5.h"

/* Constants for MD5Transform routine.
*/
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#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
; ~8 @0 G& D2 G4 q- h#define S23 14
#define S24 20
6 k& n: V f1 A6 k- ^+ u2 a#define S31 4
: G. {. z/ N" m5 _#define S32 11
. i" q' L7 o# W: T#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

+ ~8 m+ |8 P$ l" ostatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
4 ?6 n, C! j; N8 g0 g* d/ |static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
4 W- v/ \& [/ R' l+ q( g( u2 N5 ~static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
% {5 }" K5 L+ |static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
5 w1 P; g" _: X9 b5 xstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

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
};
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. R7 X6 c- r4 @. x% e/* F, G, H and I are basic MD5 functions.
*/
' S) Q3 }7 h0 h#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
% y. }9 w8 W) D, f' i, J#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
2 k+ ] x" f' X" Z5 q#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.
*/
9 w2 k% r9 a4 q, s9 g4 u* k' m#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); \
}
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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
* {5 A6 |: H7 o' m" Fvoid MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
+ K b4 t$ F* N4 ?; N! r*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
9 X% i* \ d o' u: h; l}

6 ^1 C V1 |, C$ r6 y8 @/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
0 j0 B5 n' h6 |% ?6 iMD5_CTX *context; /* context */
* V% e/ N. U' Uunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
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/* 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))
&

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