md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/

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) g& A* o7 A2 c#define S11 7
#define S12 12
#define S13 17
+ \; N$ \" v; f/ y z#define S14 22
#define S21 5
- J% F7 G( v5 {- k; w7 b. c6 B f1 `#define S22 9
# \+ U9 b) v; T' r7 Y! b#define S23 14
2 c$ \8 |# D0 N#define S24 20
#define S31 4
#define S32 11
#define S33 16
" h1 [- S, k c: ~4 L" A. t#define S34 23
#define S41 6
#define S42 10
#define S43 15
2 R3 v. M) E1 b0 Q! Q8 M; _# `#define S44 21
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. J- v* U2 M& K, Ostatic 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));
5 [( R# F% i4 w/ o" X/ b6 rstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

2 s# R0 s% ^3 ]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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7 P9 n6 A' {% p$ B3 h8 P3 w/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
% _; O; w7 [* N$ B( d#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
+ x4 |% p% e6 v2 E6 v#define H(x, y, z) ((x) ^ (y) ^ (z))
+ ]- y7 Y+ P9 ]#define I(x, y, z) ((y) ^ ((x) | (~z)))
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( @5 v6 }" N1 J3 g7 z* i( {/* ROTATE_LEFT rotates x left n bits.
*/
, c3 A- M6 [0 V9 m' f* Y. O* E) A#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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. m; ?# U: i5 G8 e& |3 {1 }0 Q; L/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. n8 G8 S0 e- j; c* C/ X. ^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); \
}
" K. w% u. |* W2 b1 [ i" s#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); \
}

4 r% O1 T g7 m, J3 S/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
7 K" v! S2 C( Z/ Avoid MD5Init (context)
MD5_CTX *context; /* context */
' h. o/ e2 P, a{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
/ ~: r% v) n6 Z; X9 m*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

4 Z1 {/ B& q1 ]% L. z5 j E2 i+ F/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
- f# x* N1 J. t+ R5 \9 nvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned 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);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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