md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/

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#define S11 7
3 b( I. y! T( p* d" |#define S12 12
( F8 {6 ?& k. ?#define S13 17
( R+ L9 `1 s" y#define S14 22
: g- C$ L+ Q) G8 X#define S21 5
8 I$ a* ]1 \6 X+ G0 R- E; X#define S22 9
/ W) h3 a; t+ r$ q+ O#define S23 14
" j- i3 d1 @1 _) I8 G9 H1 X#define S24 20
#define S31 4
5 w; {8 n# C4 F/ E#define S32 11
#define S33 16
# y; v7 G# w3 `( a7 i#define S34 23
* \& W, c, A- _: S. E( N4 p& u5 J#define S41 6
# {* r4 E+ y8 K! {1 K2 Y#define S42 10
. D& `4 ^0 M5 ?+ A+ J }#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
6 h; y! b9 g9 Z' \static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
5 l; T6 c0 e# x2 jstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

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
};
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7 D% Y0 G0 V7 M* S) y6 l/ z/* 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)))
& E% }; u- b5 \" s; H9 [#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

( C, D% F8 L; V @! q9 w/* ROTATE_LEFT rotates x left n bits.
*/
; f/ x4 V" ?( B B! K4 r#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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9 o h* _! N7 o8 n2 D. X8 l/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
7 c4 S. Y7 g- L: u7 n& r#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
' g* z+ U0 V0 z e+ C#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( E, m4 `3 K) Z" d" _4 p#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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& i/ p" [2 U: ?/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
' v$ f% X% E. k0 m, p# ~- Q5 mMD5_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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2 i7 l# E% p9 H Z9 E9 C7 v! L/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
' ]& @* I+ f! N$ K+ o3 Jvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
" C" y" Z9 Y+ @unsigned char *input; /* input block */
+ G& h" ` H" K/ T! v$ t; cunsigned int inputLen; /* length of input block */
* ^. Z! w: i" e. `9 Y' T2 [) E9 Y) Y{
unsigned int i, index, partLen;

/* 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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