md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/

+ ~5 p4 e* U: k% S
#define S11 7
#define S12 12
0 x& r3 |: I p Z. T#define S13 17
y4 I! N; }! ]9 s#define S14 22
#define S21 5
#define S22 9
% Q8 Y. ~1 I% Q5 c- \#define S23 14
#define S24 20
#define S31 4
#define S32 11
- `5 I5 }7 C- X4 a#define S33 16
X0 \- F O" B0 U#define S34 23
) f' u5 n F4 y- v9 Z#define S41 6
#define S42 10
#define S43 15
#define S44 21
/ q% u; o' a3 Q& B4 X% Q$ a
( Y$ V6 J9 t4 ~( V$ c- z& j$ P' L0 @static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
" |2 K; M o; S) ~/ M6 T& l+ \static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
9 Z1 Y1 M- Z3 O! Dstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

/ H% i S3 h. E4 Rstatic 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
6 A* r% x, H/ S& N};
, c- H6 n$ }! h
/* F, G, H and I are basic MD5 functions.
*/
0 Y) ~8 j: B$ [4 O! W#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))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
, {. P2 u* f5 t% g#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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* X! Y6 D3 g7 F6 c9 D! a& X/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
0 Q2 g, B- U/ B9 BRotation 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); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
2 W; |2 c/ L4 d5 L0 i5 H# ?void MD5Init (context)
[1 N- } ?: tMD5_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;
9 Z# }; ^7 [2 T; s4 P% y( F D}
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+ `) j- n7 P1 A/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
+ a% D% s2 y' D2 V7 V7 q# M9 }2 ~4 Ovoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
3 ?9 d( b. ^. e8 l{
unsigned int i, index, partLen;
0 [& X4 @ S/ U2 Q
/* 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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