md5加密算法C++程序

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#include "global.h"
; M K, k$ E/ p: s: i* E/ C! f5 e* H#include "md5.h"
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/* Constants for MD5Transform routine.
*/


: n+ z* u/ n. {- H#define S11 7
#define S12 12
( \, S, Y( R% c9 n9 W#define S13 17
* s" X" @: ?" [5 T0 \#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
3 d2 o9 S8 _5 Z" u#define S31 4
$ t* O& \: c1 D; t#define S32 11
#define S33 16
#define S34 23
#define S41 6
1 R2 ~# j8 z3 ~% Q8 q#define S42 10
#define S43 15
# G2 K3 `, e5 ]' H5 }) n# O& V$ T#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
2 M0 D$ [* c- T, d" Gstatic 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));
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
2 y0 r9 @& [; ^4 `8 x, q};

4 D! o$ ^* B5 H L1 B0 w8 x2 R/* 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)))
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/* ROTATE_LEFT rotates x left n bits.
*/
0 C( m- Q7 q. r3 c* W8 y#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
% @0 [; A* I. x, @. |
/* 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); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
" \. k# T" N8 \! B+ W4 p#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); \
}

2 V% O0 X0 G9 r; c( _5 \0 Q/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
: s* s7 V& m( bvoid MD5Init (context)
MD5_CTX *context; /* context */
7 p! c7 U" j' r{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
' o% k. `* d/ z! F. M# R& t' N*/
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 */
5 `6 [% Y3 d. e$ p2 uunsigned 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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