md5加密算法C++程序

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#include "global.h"
& E/ o) R" U& [& s" p#include "md5.h"

/* Constants for MD5Transform routine.
*/
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#define S11 7
& L! T8 F: I. ?2 u, Z: C/ l& N#define S12 12
#define S13 17
6 G& F5 i+ r0 a( \#define S14 22
#define S21 5
#define S22 9
#define S23 14
9 `5 ^( p. |) g( r# |#define S24 20
#define S31 4
#define S32 11
2 W7 C* e; e5 F8 i' ]& f& ~#define S33 16
( s$ v) G$ N# n5 c#define S34 23
#define S41 6
4 @) y1 D' u$ }* q0 A$ }: b#define S42 10
( O9 g8 {/ G3 W O3 o6 X' P#define S43 15
' u& i% V7 W2 `0 p( f0 z#define S44 21

! o! w" R8 z2 y9 Hstatic 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));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
6 i- z1 @2 y7 _+ A$ J# O& K. i: i3 ]static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

- ^+ ?9 }% B; S- J$ P9 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
};

/* F, G, H and I are basic MD5 functions.
*/
) e+ f. y2 O) C( f#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
- c1 l( F( K5 W' ^. S#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
+ m: i% }9 k+ X0 W7 ?, W#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
& W% j" X; q! i5 j' B3 {3 d. ERotation is separate from addition to prevent recomputation.
*/
8 C- |3 z& N* x, b/ i#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
6 K9 }7 L- H. @- w. l K' H2 Q2 F#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); \
}

1 ~- l6 c) M' P5 J' A0 X+ Z/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
( r5 e/ d8 V2 e, U. P( ?void MD5Init (context)
Z6 `8 b# N' P5 h; G) j$ X& sMD5_CTX *context; /* context */
k6 m' D% L6 y& d, l8 R{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
9 C/ ]! n7 q$ g8 ]( ?void MD5Update (context, input, inputLen)
) Q" a0 n5 ~8 r3 I: |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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