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
+ X( y' B1 T! h$ g' s# Q, _#define S13 17
#define S14 22
#define S21 5
* m( p: ]' }% A) l% P& N#define S22 9
#define S23 14
#define S24 20
#define S31 4
3 M0 ^. h4 r) G8 g M& `! `7 [#define S32 11
8 \4 A% K" d5 ~) E( o#define S33 16
. T% A8 P- A+ `% j. o#define S34 23
#define S41 6
- t1 n+ r8 p: e2 Q2 ?$ B#define S42 10
5 n: u b. `9 E$ [' C#define S43 15
#define S44 21

0 E, q) Z, c& p- T/ s# X2 xstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
. @/ V R% T( [5 z' [: wstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
9 z1 p0 W- s' R" J' a0 Ystatic 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
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/* 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)))
n& V! ?& Z4 g, n q#define H(x, y, z) ((x) ^ (y) ^ (z))
1 o/ l6 I% M. h" E0 V4 A#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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0 B8 V! h7 ^) J* e/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
8 e. H e& c+ Z R4 u# @Rotation 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); \
}
7 o% o# u& t* S0 S6 M. W3 [2 G9 ~#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
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2 o6 ~( |6 L: q5 x$ c/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
7 w: L- j% n- ^2 |5 l Svoid MD5Init (context)
MD5_CTX *context; /* context */
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context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
% x3 m6 s$ s: a: V; S*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

: ?; y+ M7 Y8 ]4 s/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
' Q) u5 _$ p2 z& k5 G9 y1 y( O0 P, @& evoid MD5Update (context, input, inputLen)
, {4 S! q T/ s5 C& [1 ?; r2 F6 m1 OMD5_CTX *context; /* context */
- Z4 z/ z) \& L& L7 ?8 Gunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
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unsigned int i, index, partLen;

/* 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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