md5加密算法C++程序

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

% s0 J" L/ F$ G a1 o4 ~/* Constants for MD5Transform routine.
*/
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3 t3 ]& s6 k# J- x" e, v#define S11 7
#define S12 12
5 C6 R8 b$ u+ |$ e; T#define S13 17
8 x# t- s- y( R+ v& o#define S14 22
0 ^8 x) R1 _6 N8 N6 ~& L#define S21 5
6 m8 L1 i: @6 P- S' s( F: y#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
6 Y1 }" o8 d7 m' ?& _4 N% T7 d- A#define S34 23
3 C! s' n5 u4 a5 z' A. c#define S41 6
#define S42 10
#define S43 15
#define S44 21

8 W; I& m- d& ]1 k4 ]% _2 M* Hstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
4 R5 v. E6 I9 U. I/ Vstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
/ q r" r' q6 k' u; J6 X5 F: astatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

. j) L8 K% @# J2 q W! Ostatic 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.
*/
# ]! {( D2 A/ e+ q' S#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
, t9 p3 k$ \6 ]2 ~, }" v: @#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)))
2 p6 a+ P7 C/ Q- @( \# S
0 d) i3 @1 w7 F" q: f- h! o/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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' {' n5 v4 p( L. M+ V$ q- [/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
$ A+ J7 Q- U* iRotation 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); \
}
2 \2 D+ Z: y9 Y( C7 Y& 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); \
}
d( E% M7 B1 |. r+ a+ K7 D6 ~3 V: z#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

8 [( s/ h9 @( {8 J/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
5 ?* i. L5 X0 l9 jvoid MD5Init (context)
MD5_CTX *context; /* context */
8 ], V" `; H' k{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
- [0 X3 |- ^, O6 i' @*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

, P2 i& O$ K9 G6 v" V) A5 s1 R/* 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 */
unsigned char *input; /* input block */
; j9 d# G' t% \8 K% i }! Bunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* 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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