md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/


#define S11 7
#define S12 12
& h+ p# \* E- p" u#define S13 17
#define S14 22
# V. S' u, @; f9 z: Y8 T R#define S21 5
+ y' B0 h" P0 X& ?#define S22 9
#define S23 14
#define S24 20
/ ?4 q* N$ i) M" n& J) N#define S31 4
#define S32 11
#define S33 16
5 Q* F" @2 K/ G6 `#define S34 23
#define S41 6
#define S42 10
#define S43 15
2 I' d1 L C8 \4 _3 O#define S44 21
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) i4 v2 q3 E8 _ N+ C1 J1 U! Istatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
1 ]. @, C) n0 T. v6 i# hstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
- {! K3 g, l% u. A9 fstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
d7 R9 o. C5 @ K8 R1 C* z9 fstatic 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
};

8 r' G) P0 \/ l- I: E& i' j+ d4 P/* 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))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
8 q' @% B3 n' N$ l% n# P#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
! H( S2 h. {! [& o#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
4 q3 O( g, i9 g" d! q0 |( l- M#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 U8 A z* d" T+ s5 e, _% ^2 S1 M#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); \
}

+ c5 q& _4 D, Y: c* D+ Y3 o/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
2 S0 V# W$ D% j% E! ?# xvoid MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
% O' d! o- b- ^. [5 b$ j*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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7 ^" y9 l2 q; H0 Y/ `/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
. n) q1 p' ]( `# B2 M) \unsigned char *input; /* input block */
4 x, \9 @6 p7 ?# q5 o1 {unsigned int inputLen; /* length of input block */
6 T! x* F$ s& c9 c( m{
unsigned int i, index, partLen;
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/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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