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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P2 K) T3 k- a( j/ P#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
% {1 M! O, f2 N#define S23 14
#define S24 20
@ A9 a# r5 x3 K! h- f#define S31 4
+ U- s$ S. V9 b: G2 R# h#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
9 c% d$ E# _" k/ ]0 |! h) y5 z2 n#define S43 15
$ U6 j+ f1 j) J4 w8 S3 ~#define S44 21

0 J0 O3 E) H2 b) |static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
! K3 J7 I M- |static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
# W4 `$ J$ K7 K5 T2 s) [static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
- _) C9 ]! y2 A! h1 Nstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

8 F% y8 |- k, Fstatic 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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6 ^ a6 ]0 E Z+ @# k( {/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
1 H9 H$ a, r1 Z4 |5 j8 t. L#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
! L% ^4 i ?% f% Z1 L3 f% _. @#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* 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.
7 q, R' E% n1 d* |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); \
}
% r/ \: n: ?1 ]% `! 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); \
}
* y9 B6 Y0 @9 g) I [, s#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
: |6 J; [, O; f4 N( m9 ovoid MD5Init (context)
0 s" m: J' i, ~) g% U+ a: FMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
* B, \$ A; T, X E( b" I: Z}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
8 d+ Z" n: u2 ]; g2 v0 cvoid 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;
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/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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