md5加密算法C++程序

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#include "global.h"
9 S* x6 g ^7 w: L$ e4 w- E#include "md5.h"

/* Constants for MD5Transform routine.
*/
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4 l* s( `1 A) V4 O#define S11 7
5 W% R& G3 o- I) V9 M9 ?3 s#define S12 12
#define S13 17
#define S14 22
#define S21 5
4 u: E/ o1 i! F4 u" U8 C5 c#define S22 9
#define S23 14
% B0 ` b8 J5 ~0 d2 P#define S24 20
$ N) R# @8 v) u#define S31 4
#define S32 11
- u, |# @1 i: k9 ~. Q! ^! }; i% \#define S33 16
#define S34 23
1 k8 U% c/ d7 U# s( X: L% w! ~% A#define S41 6
4 v" V- h! [) f3 [' G/ @4 O#define S42 10
# o* |* K0 T/ h: i( |* F#define S43 15
#define S44 21
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+ X$ y: {, f% i c5 vstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
8 U& E8 J i$ ^( s2 l3 F- Y( ?static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static 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.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
! |2 X4 ]/ h5 S' ~0 r. Z; Y#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)))

/* ROTATE_LEFT rotates x left n bits.
*/
" P8 N& E5 f3 N. ~( ^" s8 T" G#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
9 L& _/ `2 s2 }' J" Q9 |1 L* |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); \
}
; [: D4 K( f2 V8 B* G, 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); \
}
% @1 J4 s' c/ r ~#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

/ @: I6 k. J. X" b; b/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
* J! \$ k i+ c- Dvoid MD5Init (context)
MD5_CTX *context; /* context */
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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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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
! i E4 C. S- Q) f; bMD5_CTX *context; /* context */
unsigned char *input; /* input block */
! H. o& p* c! }unsigned int inputLen; /* length of input block */
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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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