md5加密算法C++程序

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#include "global.h"
" G. k- }$ I+ S+ ?8 l' @& N8 A- u#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
$ I4 K0 |- q% `5 z. X" L#define S22 9
* S5 G& z4 E" h7 O' k: x# e#define S23 14
#define S24 20
) `+ w/ C# C8 r A! \#define S31 4
#define S32 11
% ?0 D. A- E" y d& f+ u1 M#define S33 16
; p# W- o* b' A#define S34 23
#define S41 6
#define S42 10
; @$ {8 H' a' I+ A; w#define S43 15
/ V7 o6 I. t) P7 u#define S44 21

' _; ?8 x; U( m! R, e D# u% Z1 \static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
1 f+ K# H3 E' J: M8 |# Istatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
! f! u, g( e% nstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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3 {5 {/ \4 n: `5 `3 \5 Vstatic 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% h8 P$ K5 L( [! o' H/ a' T* d};

/* F, G, H and I are basic MD5 functions.
*/
2 L( S _4 `% H% ^. K9 X#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))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* 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); \
}
. m* D1 ]3 @ R#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 d% y0 f/ J" B3 i5 `! z#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.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
9 l; D. L2 w2 [* N! t- |- AMD5_CTX *context; /* context */
( J' g1 z6 G; q3 Uunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
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/* 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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