md5加密算法C++程序

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

: O7 y/ ?, X& L4 R/ n/* Constants for MD5Transform routine.
*/
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% U; X9 @; E- d% ^& {6 _#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
5 m9 c( L- Y9 q#define S23 14
#define S24 20
8 j; {3 e* w$ j8 V#define S31 4
, ~3 D+ M' \, [2 l9 T* f8 N#define S32 11
#define S33 16
' f$ |0 j+ Y+ ^3 p5 k* x#define S34 23
#define S41 6
#define S42 10
( p) Q2 n& Y+ N9 g+ j#define S43 15
3 k! B- s/ ]! S/ k! M) x6 g( {+ j#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));
5 a- q- Z% ?/ i2 Z4 Estatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
9 a; L2 m1 ]: Kstatic 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 r0 P8 N7 c \( J/ \};
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( z! d) M" O% x* j/* F, G, H and I are basic MD5 functions.
*/
3 M' q: O; I! ~: l#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
/ v1 Y6 y0 b5 |: v6 v#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

: o/ O. |# A8 r, M! R+ N6 |3 X/* ROTATE_LEFT rotates x left n bits.
*/
O" A7 S. i& p& | j#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); \
}
#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); \
}
7 @3 D# x2 k& ~5 {* U; 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); \
}

4 |" e) { S8 Q; Z5 T3 [/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
+ n T4 }" C1 k/ \9 y/ yMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
2 m3 d' q4 ]- d# L5 w6 e, ?*/
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.
*/
8 G* b9 T0 Z8 {6 g2 N: r. yvoid MD5Update (context, input, inputLen)
% m% h" a/ D; n; o% c& u8 x3 {/ xMD5_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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