md5加密算法C++程序

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#include "global.h"
#include "md5.h"
; `; v5 Z: _+ F6 ]+ s( @1 Z
/* Constants for MD5Transform routine.
*/

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#define S11 7
/ G9 a9 l9 B7 z6 _, q#define S12 12
#define S13 17
% D% Q9 V, K! ?8 d7 b& B#define S14 22
#define S21 5
( V+ _* ]5 g5 v" S5 b# l#define S22 9
#define S23 14
#define S24 20
' S3 b9 z, F& e# J#define S31 4
, K6 {& O4 p# C6 A# |0 C6 F' @#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
; D1 V' Q% [+ ~+ g
; L/ i# q' U- H: h3 b6 z9 Y) t; tstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
% N! y/ m: w- N2 y% c' vstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
+ ^) ?2 Q3 l4 Mstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
6 ~: U7 Z% I3 P( nstatic 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
* V0 T& | l3 E6 Z+ u};

/* F, G, H and I are basic MD5 functions.
*/
( o% l- S1 s% g2 v# M#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
, ^0 I7 f# ?' B5 Y, o7 ]5 B, Z#define H(x, y, z) ((x) ^ (y) ^ (z))
" e' `* B* B: z1 A0 p- k# r1 O6 n#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
: D8 D$ L4 ^4 e4 `3 G6 n5 G#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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# U- I s$ | l p1 X/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
4 N; k2 F5 }3 x+ }0 _( e+ M9 L4 ]4 x, `Rotation is separate from addition to prevent recomputation.
*/
1 L" n8 M, }! q# m2 [) M; l#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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. V- n) x7 s, p0 `% K5 z- R2 `" K/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
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;
}
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- B) j* M% N; |+ |/ _! E( r/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
# r: N1 O2 J9 V {3 v" J e |MD5_CTX *context; /* context */
unsigned char *input; /* input block */
/ H, e4 a) X( a# x* J( Q* @# ]unsigned int inputLen; /* length of input block */
+ ^9 c/ U; M& r{
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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