md5加密算法C++程序

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#include "global.h"
#include "md5.h"

/* Constants for MD5Transform routine.
*/

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8 Y. {& \2 @+ Y" ~6 k: P#define S11 7
+ A" o4 Q9 f. a8 H0 u#define S12 12
#define S13 17
. Y4 u! `2 f. q#define S14 22
#define S21 5
#define S22 9
#define S23 14
1 \, _" ]# i9 v5 S) ]- p6 e#define S24 20
#define S31 4
#define S32 11
* a* f( E8 ~$ \0 X6 k# E. m#define S33 16
#define S34 23
#define S41 6
#define S42 10
3 Z( r* m, G1 H" k#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
* T8 O; w/ T' f# O$ v% Zstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
: q! o- Q5 Y( Xstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
- L, I2 o6 ]2 ~( fstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
! m: @3 U* k8 U* }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
. C4 j6 a( |$ V7 h};

7 C- z& X0 K4 K) K5 k! k/* 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))
, m2 x( o+ }' p& j; i#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
6 P: r: K3 u3 d$ r2 q) L#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
& m; u9 @6 \- t; G
' H9 B5 V/ B S3 }/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. W y; }9 M& l1 E9 P _5 L/ P& {Rotation is separate from addition to prevent recomputation.
*/
2 N) }. \3 w9 C7 y2 L#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
7 C( s+ S7 Z4 |, ?2 Y5 G#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
* G1 C9 W, n3 X#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( Z: j9 j' Q: c f. N' }' \3 P( d#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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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
& {4 H: I a9 s2 C5 mMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
. e8 L5 o: S: o6 Q: @. q*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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; i9 s# y h9 H; a, [+ X/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
, k% E# A% X. z1 m+ s, i* g/ Dvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
; w1 y% l2 \0 s0 g, l/ C0 \- K5 Kunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
) Q2 j# a4 l! J& X+ A$ D: ?: \
/* 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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