md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/ I, K, V: g6 }6 p2 O/* Constants for MD5Transform routine.
*/


#define S11 7
/ y J: s( I" J6 P$ ?8 L* x3 v+ F$ ~#define S12 12
#define S13 17
#define S14 22
4 s* {6 E1 @$ ~7 X* F$ X4 J+ o: L& Q#define S21 5
#define S22 9
#define S23 14
t' Q/ }! H0 S. q7 a, e#define S24 20
#define S31 4
#define S32 11
; J( s6 t- `$ _( y#define S33 16
#define S34 23
/ S! u5 o0 P& e& s: h( ]) d: C9 n#define S41 6
* T- H7 a% a/ |" P# L#define S42 10
1 I/ M; p, u7 ~) _#define S43 15
" j' L$ j6 N6 C5 b; \7 g' C#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
3 T7 W0 S" ^* s: A; j9 @static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
( _$ I% z( n! u# p2 S/ T& Cstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

# q; I, A. s- ?1 a( i4 d2 Nstatic 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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' l" Z: h1 S) I/* F, G, H and I are basic MD5 functions.
*/
+ ?" x# D; R" g; o" b0 O8 c#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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Z: n* R8 c5 \5 W/ c/* ROTATE_LEFT rotates x left n bits.
*/
% @8 k0 E! e# i#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

2 e7 A8 }+ b. ]' h( f) J/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
& M# e. g6 M! B* T3 v& b Y, \#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); \
}
( j. V' s2 g! `* ` d9 P, |) ^0 B; W) }% ]#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); \
}

( ]% ^* T4 p; [- N2 U/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
& D/ \2 K4 e7 Z' z }void MD5Init (context)
4 v3 ~3 m+ j0 r" D0 O$ _MD5_CTX *context; /* context */
8 z0 T. Y+ v0 g# V$ W! P{
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;
) ]3 w& d& l2 _% {}
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" a6 T* n4 |1 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 l6 r: c& q+ w8 g) f{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
4 r0 G0 y$ w1 Z# H8 }6 X
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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