md5加密算法C++程序

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#include "global.h"
% v1 j& \, S# x# F- k+ `#include "md5.h"

/* Constants for MD5Transform routine.
*/
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( i; K; w* ^' e. j2 b2 L#define S11 7
#define S12 12
#define S13 17
* h( O8 M% f+ V6 ~ u& y#define S14 22
2 y& L' P. {, B! B2 b9 [#define S21 5
0 I6 d i% I3 _* N& ~8 k* ?#define S22 9
#define S23 14
#define S24 20
#define S31 4
- S% S1 u) u: {& |1 ?#define S32 11
#define S33 16
#define S34 23
#define S41 6
2 H S( c+ h9 ~: a% S) p' u/ X#define S42 10
8 T1 S! ~5 x1 Z2 ?! W#define S43 15
! s+ J3 m4 }* k+ n0 [4 n! l& `3 e#define S44 21
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t. d$ I( L1 O5 u8 Wstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
) [, j- O f9 `static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
: D7 ~+ ]1 x+ _& X+ W* ^static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
7 J6 e; R& Y" l; X. W# p! Wstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
7 t* i3 p! L. z- @
5 ?4 q! D$ @/ J# q8 Z6 F$ N. U" dstatic 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
) ^0 M' R* J+ u: u7 k};

& }5 B8 y4 ~5 r7 {4 A, A! H. j: E/* F, G, H and I are basic MD5 functions.
*/
#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)))

6 ]6 n& s/ y' t5 X. A5 [1 Q5 q4 @/* 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.
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); \
}
#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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6 v; Q9 b# _7 _( ~/* 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.
3 I" I) P/ b% M0 J( K4 R* K# ^1 O) P8 m*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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/ g$ a/ y0 L: M8 n% M/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
( S8 u- ~; I0 L( V! G: Svoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
) p! \3 d* W4 _: Lunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
; Z1 [6 W% r& k) \/ @ E( t
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
8 _( i$ ~5 [ `0 K
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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