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.
*/


! s% }1 V# O4 @* z. F! Q% l#define S11 7
- H, h5 y0 Q$ a- e#define S12 12
#define S13 17
#define S14 22
( t4 h9 d: T; E; n#define S21 5
#define S22 9
#define S23 14
#define S24 20
1 _! Q# p4 o$ E' k8 J#define S31 4
0 \( L6 h$ g/ C) i# N% A: a7 k$ V3 M#define S32 11
#define S33 16
0 t* J# }. W+ k3 @* V8 n& ]; A#define S34 23
* a4 W& i* B6 Z2 @; g#define S41 6
#define S42 10
#define S43 15
4 L% Q3 y& j6 ]8 A4 G' t% k#define S44 21

2 }, x% N, D& t0 Istatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
! F6 ]& m( b6 ]7 T. D: W9 I, @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)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
. L5 [" U4 r0 d) g2 c6 T9 f: ~6 s- n#define I(x, y, z) ((y) ^ ((x) | (~z)))

: z/ R% F4 z1 r6 d) P/* 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); \
}
3 d8 x* N2 \2 x7 L. ~3 ]" i7 ?1 _#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
5 R l! b1 r3 ^1 X4 c! Y! l#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
* Q1 @ e4 Z z0 j, G#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 */
8 w. a! v$ Z2 N! S! L8 w& @{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
+ `* m) n+ h. e% O+ ]8 I7 ?*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

. J, I* B3 g' k' N% c4 z, @/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
- t0 c; a7 c# X; r% U' Dvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* 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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