md5加密算法C++程序

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#include "global.h"
4 d" W) J) L3 E9 C5 o( _; C) i% ^' p#include "md5.h"

: g) d4 \( | J+ u: e/* Constants for MD5Transform routine.
*/

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; `0 c% ~& `& I3 O#define S11 7
#define S12 12
3 C& t0 n& }1 q: v8 R; f#define S13 17
+ u5 D$ b( V9 o9 [3 N' I$ t#define S14 22
#define S21 5
8 {- s% H$ c# }) R#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
8 F& i. \. o. ?9 R#define S34 23
9 s( u' ~7 E0 l9 a l$ A#define S41 6
#define S42 10
: O1 B4 a* Z! ] L; G* S- [#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
* c z+ ]$ B. }2 @3 }static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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. C" L3 N& |( f, z- q# vstatic 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
+ p& O3 F- N# o};
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$ e) _# D# v: Q7 _. T5 Y( x/* 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))
% g+ }, J' P/ f# |7 N9 m#define I(x, y, z) ((y) ^ ((x) | (~z)))

: x2 o! n* u0 C6 Z- ^8 T' d/* ROTATE_LEFT rotates x left n bits.
*/
8 }3 N7 t) W0 ^6 X+ f& O#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. t" O8 e% f0 Z- F$ VRotation is separate from addition to prevent recomputation.
*/
. o N& ~1 n& V' q. ]3 d#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
" C# |5 ?$ }9 T#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); \
}
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& v6 ^6 f1 V8 i7 V/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
& f' f: ^# {- J1 i Z' u$ g{
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;
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1 `8 O# k4 ~9 c, A8 P9 Q/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
* h% d, Y4 p; C+ \$ ~2 ^MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
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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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