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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4 P r" Q0 ~0 Y" O#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
2 N6 ?, W) M: v, k2 D#define S22 9
#define S23 14
7 k) W6 u, g- m: }#define S24 20
#define S31 4
) {6 e3 {+ d# s! A' f# ?#define S32 11
#define S33 16
P2 ~7 ~* c, i: k5 L#define S34 23
#define S41 6
#define S42 10
$ b7 V" b8 k5 y" l2 m5 |#define S43 15
#define S44 21
; q$ [, `0 U9 [5 T+ @$ f+ b' q
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
* l3 e. Q( O8 T D1 E9 t% Mstatic 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));
0 g9 X+ w% n0 c: g* rstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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4 t( d# P& S( \" v0 l4 P; \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
f1 ~5 }0 M" w$ e9 g" i: b. l& F* |};
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( T! T9 f# f$ t6 J* Y+ m3 q/* F, G, H and I are basic MD5 functions.
*/
; \( ]; O5 T2 e#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
) j5 {) `* w, e& `+ g; C#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
% C; e: ?' P2 n, i! N#define H(x, y, z) ((x) ^ (y) ^ (z))
* q, c% V( S3 B: X#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
+ F1 h: L3 |+ `/ Z, _1 }0 g. ~#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
- B0 N X' w/ a3 ~3 J4 GRotation is separate from addition to prevent recomputation.
*/
& B* x0 e% v$ q ~#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
* \1 `/ I; e' a8 K4 f) [#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); \
}
% A$ ^+ v0 i/ S( I#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.
*/
* K; e0 @! T; Z G" Cvoid MD5Init (context)
MD5_CTX *context; /* context */
& a6 D$ {8 O( T. q{
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;
}

- @6 r' C3 ^: Y0 j* B# Y( p- x0 r/* 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 */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
5 n r8 y7 e6 j0 k1 J7 t{
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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