md5加密算法C++程序

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

$ i w' w; v4 R8 @* o/* Constants for MD5Transform routine.
*/


#define S11 7
3 E% @9 r% j8 t+ \; z5 m#define S12 12
! N9 r Y4 X# a* O% P% O% W#define S13 17
: Y1 \, ^, o9 O#define S14 22
! Q( ?/ m/ i& \, d R1 \#define S21 5
$ P* A/ P1 y' F) n: ~9 u#define S22 9
#define S23 14
#define S24 20
#define S31 4
4 h. c- ?+ n, r#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
; B" y! p9 t$ g1 E: u" B
* K* F* i0 `- }static 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));
4 z; ^- s! N9 {static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

- T, @ t, [3 @8 x) Y+ Ystatic 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
; P% |- a. R6 i6 g4 T# E};

5 @% A( d! _7 \4 N r/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
3 B% }/ _. T9 ^6 X4 ?#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
! s- M4 Q, l5 |) N7 Z#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
) D& B4 c( v P
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
$ c+ |0 O' Y. M+ y t4 f1 ~! Q1 _7 Z2 pRotation 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); \
}
5 X2 y X4 S3 V, H#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
4 X7 ^+ Q* j; g#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); \
}
l; R9 {! P5 a u( ]
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
$ v6 c6 g8 y1 m0 K4 P0 p: Z+ mvoid MD5Init (context)
# d% V8 U9 _ y, v* A3 JMD5_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;
7 T1 W& x& i1 P; Z/ N" Q" @}
( s U2 T7 `) I
/* 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 */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
* b+ ^3 B+ w$ N7 c{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
/ e) e9 A: @" w! g1 `
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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