md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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: ]& r$ n* u5 W5 k$ [" Q/* Constants for MD5Transform routine.
*/
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#define S11 7
#define S12 12
#define S13 17
#define S14 22
E3 Q8 P. M0 @$ o#define S21 5
#define S22 9
8 I( H5 Y/ P3 P2 d! _3 P- {" |3 d Q#define S23 14
#define S24 20
& G5 K8 h( e0 h6 q b0 p3 G* H#define S31 4
0 L( ?/ L& x, h. u1 x) F5 T, s8 P#define S32 11
, t* ~3 y7 B* W; ~#define S33 16
- a7 G9 w7 m4 `" z#define S34 23
8 @1 T9 t6 ]3 s$ ]#define S41 6
% U3 T* `+ _" K4 D$ ~5 y2 p" x, J#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
d) G- R* H4 e. e6 ~. Cstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
( n7 o! j" L# x1 a) L: N( _static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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9 K" q2 C* P. X5 @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
" h3 [+ j0 `' r( l% [# B2 X};

/* 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)))
2 k$ n6 `" L! F2 y#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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- n% B) N: q! ]/ E0 L5 E/* ROTATE_LEFT rotates x left n bits.
*/
) C8 {/ Z! ~1 N% F3 t& U8 V! S#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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1 E: q: H% Z' [/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
& S3 j7 \, i( K1 I#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
# X; Y; e+ Y: x. I& T# w9 ?#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); \
}

1 H, j8 ~# ?, o( m; Y% f/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
% \& ?8 Q. e* }: ?: u{
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;
! [* C. O% Y6 D}

) s7 [6 f3 ^/ T" H9 b {/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
1 @3 N- q3 p3 a6 N2 Z* cvoid MD5Update (context, input, inputLen)
4 w0 }1 C4 |- {8 K V9 B0 dMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned 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);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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