md5加密算法C++程序

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#include "global.h"
$ L" Z7 a( ]( p#include "md5.h"

4 Y. s; i; _8 h( V7 D- e9 i/* Constants for MD5Transform routine.
*/
+ s; z! e5 |8 `

#define S11 7
' L$ o' v9 O& l9 H3 l#define S12 12
#define S13 17
0 Y' N; y x# a4 ?: y#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
0 K+ k! N* L h#define S31 4
8 s/ s% B8 \1 ? L+ L2 Z4 p# Z#define S32 11
#define S33 16
#define S34 23
% z/ ?+ n; m; Z6 V% y#define S41 6
#define S42 10
#define S43 15
#define S44 21
, }( [4 Y. O0 x! Y
% `' R( |# C3 mstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
/ ?0 z5 j& F9 q) n0 m# C; `; }static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

2 F" X8 E3 U, y" C" |$ astatic 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
};

$ s$ s/ ^! ^* N1 ~) \ K/* F, G, H and I are basic MD5 functions.
*/
9 g* z8 U, T G5 A* y. e' K, M#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
2 ^; ], _- S4 Q4 E#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
' m; \3 x! q) @: x
a# A* J4 @; l4 N/ b/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
% T! _% G* c1 j4 Y6 G# o% J
0 D2 G. z+ @; G1 P7 f. |; y: p/* 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); \
}
$ O {1 @0 C7 A9 t7 A#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
% K% y# Q! ?, q$ j# r' \/ `#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.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
" d6 p/ h( r* Y5 `) X+ Q{
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;
}

1 ^0 f5 z. E# a# m/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
0 T+ A: E* Q# a& K3 H0 DMD5_CTX *context; /* context */
3 N! b3 t) V- dunsigned char *input; /* input block */
: u" j' q# W( Dunsigned int inputLen; /* length of input block */
: u, i$ I7 a+ c% F5 @{
unsigned int i, index, partLen;
4 |6 N, @8 @2 z8 k
/* 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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