md5加密算法C++程序

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

4 O) y% K) N# v2 ~) M& p/* Constants for MD5Transform routine.
*/
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2 g! V2 q2 T; y1 O) U, j#define S11 7
) ~9 U+ J3 Q/ t) H2 K: |2 W2 {! B#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
, D6 N2 C' e2 c! X* Q+ X* t$ J#define S24 20
" F: C& c9 t0 p' N* Y9 k* q#define S31 4
#define S32 11
/ H) Y% @ K8 s2 c#define S33 16
+ _! [; b7 ^) q#define S34 23
#define S41 6
#define S42 10
6 q5 y* e8 ~: k% Q* N$ Z' r$ m#define S43 15
% E, I; A, D5 X$ K2 X#define S44 21
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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));
+ b* N+ Q- u* X. ~; kstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
9 K/ J+ M. O3 cstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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
};

/ L0 S) `7 h1 L! Q/* F, G, H and I are basic MD5 functions.
*/
1 J' e+ d9 z. f" `3 ^2 h# a# S#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
( [; w8 c7 U. L! E9 v g' \#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
$ R/ n& ?3 {' g+ q#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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" f+ P8 X' f2 p/* ROTATE_LEFT rotates x left n bits.
*/
2 R6 w4 P/ i J, ^" z+ f, |4 D#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

5 R5 P+ h2 u: S1 F. Q/* 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); \
}
1 D# \7 Z4 c5 ]! W; v; b, h#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
5 H! }( Z. U$ ?1 h/ e- N2 i2 t#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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& O( q( M" {5 q8 P& F/* 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.
2 g/ u G# f- U# k*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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1 G& t! H; V, R9 d9 }
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
5 m8 X( K- e" h: \" u- OMD5_CTX *context; /* context */
+ ^) v9 H1 }) F/ R/ T. |( Tunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
( t$ H2 I+ l, }8 L( Y1 L: m{
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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