md5加密算法C++程序

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#include "global.h"
! M$ W! D$ l$ C# a$ f0 D. l#include "md5.h"
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/* Constants for MD5Transform routine.
*/

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9 O( e9 |. L C# M; D#define S11 7
#define S12 12
#define S13 17
6 g' r0 y }4 }, @#define S14 22
#define S21 5
#define S22 9
#define S23 14
& S3 P1 f; Y) g l5 R#define S24 20
#define S31 4
#define S32 11
#define S33 16
& T! w* V0 M- A- z! T% e. R. _: r" E#define S34 23
#define S41 6
# [" e0 Q/ h r& F; [' |5 ~6 ^- i4 e#define S42 10
#define S43 15
1 j1 [. b" _4 x- }. s: C- I' N4 ?! W" z#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
; h3 F* S' J$ ^+ d9 a8 h, G8 jstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
: a8 c! F8 O% L6 |. Estatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
4 x( ?8 J5 |* D' G+ fstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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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: x" V @; r4 Q d6 \/* F, G, H and I are basic MD5 functions.
*/
) H$ h) F1 `5 _7 E/ b4 i' L#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))
& O7 q: d# {9 m2 ^! d" C#define I(x, y, z) ((y) ^ ((x) | (~z)))
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. s2 b* A! v: J$ P4 z8 Q/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

! y. r! F& l& J6 x/ [/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. c: X$ v% p' ~" m! fRotation 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); \
}
9 _: k L: ]% P#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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* e% C1 ?+ Z" f' b! w/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
2 ~% _- m- T+ C- mvoid 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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0 Z$ {6 L }$ ?" p* j3 b/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
, ]/ q5 N: F& a1 e, {8 z, r) YMD5_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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