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
#define S13 17
T9 w6 m$ c* Q& Z#define S14 22
% y9 r# F A. k4 w a. K4 n* t#define S21 5
#define S22 9
: G& ?5 v" m& X! |$ ?+ A#define S23 14
#define S24 20
#define S31 4
! W% s# @* Z) d% i1 n: J9 ~3 m% G; |#define S32 11
7 e1 d6 j/ V" r0 o0 L#define S33 16
#define S34 23
5 r. w5 }5 ^$ J# X. u#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
! y7 D7 d, y' ^6 Y" P1 N' U/ rstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
6 y6 F* m, C# T$ F0 P" A9 {static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
3 }, @; F8 @8 s! H) i# bstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
1 ^, Z# h) _# X4 a8 b& ystatic 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
};

% s- N6 Z9 N$ G3 u4 |# x, `/* 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))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

* T* N5 `: O4 i" A& j2 |/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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+ t! v- G# i$ I3 R4 C( S/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
7 d# N0 A7 D& d) g; N2 m9 qRotation 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); \
}
6 H9 X8 b& F' u* g" o4 E#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
9 A3 t) _( O. f#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
, V' H) t- H8 ]' ^' A0 F* x#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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/* 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.
0 ^" Z0 ~ i! ?$ p+ Q*/
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)
MD5_CTX *context; /* context */
* y7 r; E) x% Kunsigned char *input; /* input block */
- D) u1 t4 W' m3 O9 Wunsigned 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);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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