md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/

! i5 w! ]# h0 y' @0 R! n& m3 ?8 w
#define S11 7
#define S12 12
#define S13 17
#define S14 22
7 J# B7 {7 A% h/ E3 P#define S21 5
* y2 y/ L3 z: R' R$ F2 X# U#define S22 9
#define S23 14
+ [. K+ g0 |1 a! y5 K$ {#define S24 20
; R f) s" t; e#define S31 4
2 c6 }& n- I* D/ R#define S32 11
% e: q9 @( l# h. k+ N+ ]; Y1 r0 V#define S33 16
#define S34 23
4 [9 K; P, t5 r6 j, Z/ ?! P: G, V% y#define S41 6
#define S42 10
4 F7 [1 M' A* T. L/ a& |; g#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
5 t1 T: m% f7 a% O0 \; A( vstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
& v4 D6 O6 C) ?2 r" Cstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static 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
};

- h1 @# [, W# g' m# B0 Z6 S/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
( k# d8 O; `- Z* h9 q7 e#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
' ~' l2 H, z' C$ A7 M, D& X#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.
*/
6 C) u: @$ S+ U! p# v8 L#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

5 G6 H( G0 C7 [. X% l: K! a5 d/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
4 A+ X: \1 V2 f& z* F: o#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.
*/
1 ?3 Y# r/ D C; I; h1 m* Svoid MD5Init (context)
MD5_CTX *context; /* context */
2 n: R% O) H6 B7 w7 [8 Y{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
$ G' R ?9 k) P; d% {; n' u( G*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

1 t. L' S& ^$ F- X/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
" O ^! w$ G/ sunsigned char *input; /* input block */
$ I# _6 b+ W9 Q, Uunsigned int inputLen; /* length of input block */
* V h" G5 Y6 z! T$ l+ |{
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))
&

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