md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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& M" t. S) N+ G$ s b; r. C/* Constants for MD5Transform routine.
*/
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/ E! g f. C, U: U#define S11 7
% ]4 }6 E; D: }/ e#define S12 12
5 n0 o, |& ]- p4 X2 f* s7 N1 I+ g#define S13 17
! c, @8 v* ~6 v$ U#define S14 22
#define S21 5
7 L/ W+ U; ^ h% B/ O" j* z#define S22 9
#define S23 14
6 ~7 n# q; ^( X4 v#define S24 20
5 g6 B0 h y7 D3 ~#define S31 4
#define S32 11
#define S33 16
$ |; k6 K' _5 J1 n( L, |) X8 r: w#define S34 23
: d# ?0 \. b0 c- q9 k3 Q#define S41 6
#define S42 10
t' V- g# {& }! L#define S43 15
6 x7 v6 m( Q& W! K7 T/ `* u#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
2 f- y9 R& q" D: Istatic 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));
/ s* L3 q# A) n1 D' V$ f2 g9 \static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

' Q. @% M% G7 Wstatic 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.
*/
( s) \8 l9 h6 ^( r0 x: F7 F#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
2 `' \) `) ^+ d; h" i2 b5 T#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
# I7 S# `- @3 E7 t#define I(x, y, z) ((y) ^ ((x) | (~z)))
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( V, M/ I; ?, b9 v; G/* ROTATE_LEFT rotates x left n bits.
*/
: f+ L( O( c6 B* d9 j9 K#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

& c! N: b+ u2 c$ d: t0 m/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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); \
}
$ I5 M$ Q. w5 D# o% L#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); \
}
6 v5 R+ ]3 l! G. F4 I# @#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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' e+ D. x1 d$ F5 a& [" S0 T/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
{
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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/* 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 */
unsigned int inputLen; /* length of input block */
3 d2 E8 C5 e9 i* s. t1 L5 e{
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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