md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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% K* g3 C- v D9 |" m/* Constants for MD5Transform routine.
*/
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- k- N+ }2 G0 H1 b0 {#define S11 7
#define S12 12
6 p6 q2 l* H& j2 X- [: I1 e#define S13 17
#define S14 22
8 J: _1 v$ _8 O e#define S21 5
#define S22 9
#define S23 14
#define S24 20
- Y5 {9 _, H4 c* t8 @( n2 A#define S31 4
#define S32 11
0 w' e; n$ a$ U2 v! O#define S33 16
9 }- m% ?3 r2 A' K& f9 H$ P#define S34 23
6 J9 M1 w, N! n5 \#define S41 6
& l( Y7 C0 ?2 @. Z6 N/ G1 t( g. ]- X- A8 u#define S42 10
" |# p6 I) C7 k#define S43 15
/ B" X2 W/ H9 c' E#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
3 i6 R- J Q9 n3 x T: Xstatic 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));
3 _' F" X( s8 Jstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

2 A* w* E3 g n1 ~3 B6 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
};

( D- g0 N7 B3 @5 p6 p/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
# |$ o) A4 Y h9 @% y- `& A#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
. @7 o2 O7 }- [+ {#define H(x, y, z) ((x) ^ (y) ^ (z))
& b9 N) B. W6 { z7 I! @/ Q! w#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
/ s4 _* n3 [/ n/ c#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.
*/
" b# Z3 w6 P+ |# j: {7 ~& n' N3 X#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
u& I2 U3 |0 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); \
}
# d; |; w% J$ 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); \
}
/ k2 M R e9 F#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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4 y% _5 Z: q2 ]' R/* 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;
}
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3 ]2 J8 U4 h* @- k/ Z* s3 [- h/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
7 Y5 f- _$ S- H" P/ kvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
) G3 x& D5 _5 m/ G/ Cunsigned int inputLen; /* length of input block */
, i+ P* p. N1 a# Z* K+ [/ {$ Y{
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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