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.
*/


#define S11 7
#define S12 12
5 v0 ]1 [' w8 `- Y. E! _3 n# h#define S13 17
#define S14 22
' }8 h) e: u1 J6 n5 {#define S21 5
% S( N8 O3 `! E% n& ^' u; g9 H#define S22 9
& Y) W9 {! m. a* f1 O#define S23 14
#define S24 20
#define S31 4
9 n! {2 g/ o q; e o% ?* p#define S32 11
#define S33 16
. D1 s7 m) \- r3 I. a3 v [#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

/ _( Y/ A( X2 L+ X" I8 fstatic 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));
* k3 w; m4 k0 u: e @5 Cstatic 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
};

/* F, G, H and I are basic MD5 functions.
*/
) {. u6 M9 N( T6 G8 ]- b; I#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
5 D: B9 L& ~( Q$ |; ?& i% }$ z#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
7 R1 F' A: ^/ D3 r2 K#define H(x, y, z) ((x) ^ (y) ^ (z))
' K4 s/ l/ R& h#define I(x, y, z) ((y) ^ ((x) | (~z)))
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; A. D D2 F+ C! l8 ]( @/* ROTATE_LEFT rotates x left n bits.
*/
1 |% @/ `, V, [( ?. \6 x" c#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

! ]5 y3 t7 M$ J% L& Y$ H4 v/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
0 `% Q& I* k9 u. X8 \2 T0 RRotation is separate from addition to prevent recomputation.
*/
+ j' x0 X0 Y* W) w; ?5 B1 H R, c9 o5 _#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) ]2 \3 @: U; y#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
9 h q7 C1 d: m. I1 K#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
: F3 l4 x' u$ b5 F( G#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

/ h8 _, H. |4 E1 A/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
$ Y+ j6 y+ F& @0 h( H6 N% Q; N1 bvoid MD5Init (context)
* _7 n& J. N8 s1 Z: fMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
- L( b; e9 S) [5 V; B*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
& i( s' A! _' c9 y" I4 }8 evoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
+ s4 N! ^- B# `{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
/ U+ a) g4 d4 \# }. H% ~
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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