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.
*/

; l6 o# m1 ?: `0 w2 w7 @. }9 @$ K
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
7 W) v. p9 T$ Q: ]4 j6 Z* m3 ~#define S22 9
, h) w; F/ e* \ _, J* Z% g#define S23 14
3 M- k9 [5 @; v7 T2 Z# s) |" T#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
6 [; h5 r% w M) ~8 R#define S41 6
% g% M9 H+ ?: H; P$ Q* Z( a. g#define S42 10
# H5 C% j( v/ z9 G. u#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
6 s/ S3 L- j9 V/ k/ x4 D: Rstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
$ d& w' d- R$ Fstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
! Y) g2 @' u& estatic 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
% q7 g9 x0 [. q$ T5 \& J" r};

" c& ~* y" g1 }. J R/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
2 D2 }# Q0 S" ?0 X#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
5 L/ @* n1 F+ Y+ E#define H(x, y, z) ((x) ^ (y) ^ (z))
; b: x9 D6 F) k" {#define I(x, y, z) ((y) ^ ((x) | (~z)))
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k/ K# O X+ n1 f: J/* ROTATE_LEFT rotates x left n bits.
*/
4 H( s. J, R- ?- u1 J% X#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.
! m- m8 {- T3 M4 P$ \Rotation is separate from addition to prevent recomputation.
*/
1 J+ o" R3 _6 P, P. j#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); \
}
$ P5 m" D6 M7 Z% J4 ~ _#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_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;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
, i9 z9 D* l" f; \4 Rvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
7 e5 R: e1 G' M: y$ |* r" h4 bunsigned 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);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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