md5加密算法C++程序

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#include "global.h"
#include "md5.h"
1 \& T: x. _# K( k0 \' T3 j
! R$ ]/ {2 S) Z6 h7 h/* Constants for MD5Transform routine.
*/

1 J- h0 F- i$ X* t
+ t, k9 p6 O& d4 F; x#define S11 7
#define S12 12
#define S13 17
#define S14 22
, I# x2 s. W+ w/ R#define S21 5
#define S22 9
#define S23 14
#define S24 20
7 J2 X5 W5 P; h( B#define S31 4
4 R4 P3 m/ U8 F6 n; O#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
6 V& U% d; s M: L* k0 x#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
8 y1 R" _ x U3 W; ]. Mstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
, ^- F. _& A4 w' I) C- `; tstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
7 ?) b% m! S! _$ Qstatic 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
};
# N& \8 \* I# X6 H! S5 {- N
/* F, G, H and I are basic MD5 functions.
*/
8 v8 b! u. }- L& {5 G5 I0 S#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
; f- Q: c, i, B2 z#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
$ p2 b8 I$ F7 H1 _; ~9 ]
) {! \6 @. k I0 Q) {% B- `& d9 r/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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! X; p3 k& c+ U( |% h/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
: T" o" h: G5 O, YRotation is separate from addition to prevent recomputation.
*/
, ~: ~2 {6 O4 r6 `7 N; ~! y8 G#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
8 X2 B0 j. _, n4 U#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
+ a/ o3 Q7 @$ A! h#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( r8 y4 t! w% s- ~( 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); \
}

. F2 t. ]' _2 O3 y2 `9 Z' N/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
. [7 `1 f6 E( H! o/ [( iMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
4 b. c6 k# f* Q, z3 K+ J*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

& N8 V% \; z7 ]% [% H/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
# T K$ q& N% {. W$ h2 d. ]" AMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
3 E3 @) H. I, k{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
G7 x; B5 a5 f0 E* J0 O* S
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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