md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/


#define S11 7
#define S12 12
8 Z5 m' l. F% W7 W#define S13 17
/ \/ D( W# A; J% G& b% P#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
6 |0 b$ A. O2 X9 `#define S31 4
#define S32 11
O* \4 r4 _3 P" p* G#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

5 t. E# ]- q" `3 r3 _/ f' nstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
% J1 ]/ w$ O3 L3 B( Dstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
6 s" I* Y6 C" L, ustatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
- `% K7 {' x$ V% Z( Qstatic 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
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/* F, G, H and I are basic MD5 functions.
*/
! a) s7 s. I9 ]" E% l7 c" j5 |" L#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
6 C3 P9 `1 o# ?#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
5 |7 x$ N( w* W* d2 S#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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# l7 d' Y) _9 k6 l- \/* 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); \
}
0 N1 N* u2 G" W#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
! m# F8 x! C8 i7 I7 a0 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); \
}
#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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$ N) p# X! R' Y/* 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.
3 F* C7 g( @ Z+ t8 H*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

/* 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 */
" n$ o( U5 D1 C0 o, \: k6 Yunsigned int inputLen; /* length of input block */
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unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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