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
#define S13 17
4 d7 v: S) Y x0 V: u#define S14 22
5 j5 k0 w. x, J1 M#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
4 I% O; ~5 {2 x% S0 H4 L/ m! m#define S33 16
#define S34 23
1 F+ r, g( d4 {9 B+ M#define S41 6
#define S42 10
# |, \/ }2 \: ^" r1 @/ D3 E8 K#define S43 15
# J( T$ e+ u4 D( `2 A% B2 e2 C. e#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
5 Q) c* a, ?2 m, I1 I9 c+ ?static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
3 p( ~: o, m1 I6 z& ustatic 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 p! H( g) C! R, ?' }5 p2 t/* 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))
" R$ O, o# w5 T9 B4 y8 _#define I(x, y, z) ((y) ^ ((x) | (~z)))
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- i8 [+ M- c: b/ S5 m4 x/* ROTATE_LEFT rotates x left n bits.
*/
/ {5 P& T$ K5 Z7 l#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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: O) C" x0 }! @0 a, \/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
( H3 g8 r! j+ K r5 lRotation is separate from addition to prevent recomputation.
*/
/ v, Y* m3 d" H# H#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); \
}
. @* R9 c- t$ c0 U, j. f( L#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); \
}

5 g' I# l" b7 z8 @+ ^/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
! @$ F& ^4 a3 p8 ]" S% WMD5_CTX *context; /* context */
3 T& K6 f5 k4 `2 i{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
8 E4 j* S. f9 F& T*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
# ~8 q d: E2 l; p" }( ?: I}

; T1 C7 S% J0 G" e! U0 Q+ W8 A/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
, M1 T6 @! ^; b4 c9 d5 G0 \) @" S/ K dvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
; f1 z p$ R( |6 N8 j8 L: I' ^unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
& o7 f' t% X3 J* Z9 F7 Q! l: l{
unsigned int i, index, partLen;
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/* 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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