md5加密算法C++程序

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#include "global.h"
#include "md5.h"

/* Constants for MD5Transform routine.
*/
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+ Z* w1 l. @- r$ W/ X" K#define S11 7
5 @/ ^& _" b: m# `% z#define S12 12
#define S13 17
#define S14 22
& h- {0 g; J8 _#define S21 5
#define S22 9
#define S23 14
#define S24 20
( `- e5 z1 w% q1 s5 L#define S31 4
6 Y4 S5 {; X* E' G#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
) ]. G) _* @/ M0 j) H) o- A#define S43 15
4 I7 d3 s7 P$ `#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
) M* z: E/ u5 }3 jstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
" P* ]) B! ^5 ~( C* N, ^& Estatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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) U: x+ k" z' x8 w, ~9 Hstatic 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.
*/
, U/ F3 a J% }: l#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
# c# t% j/ c0 m$ a- Q#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
3 G/ G- C! Y3 `3 p( M#define H(x, y, z) ((x) ^ (y) ^ (z))
! y" b; _& V/ [( p( S, A#define I(x, y, z) ((y) ^ ((x) | (~z)))
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& x/ M A3 C0 d: }/* ROTATE_LEFT rotates x left n bits.
*/
#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.
: i) R5 @0 A$ U) } O! s$ h3 \7 wRotation is separate from addition to prevent recomputation.
*/
* `+ v: ^) m, e8 g3 [% x#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); \
}
#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); \
}
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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
1 _% P3 d' o8 A( x" o$ [1 W8 Ovoid MD5Init (context)
2 F7 g, ~! t3 j# ?6 r: zMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
# r$ U9 R( q9 Q( H9 C*/
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)
8 f1 e3 t7 A. S1 C& ~/ _MD5_CTX *context; /* context */
. }: j* t2 S& c0 junsigned 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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