md5加密算法C++程序

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#include "global.h"
4 D3 q2 x8 V' Y% C#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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- g) N- W% a# x' K \2 Y#define S11 7
#define S12 12
. m# G4 L" f: I7 O& w2 x2 H#define S13 17
#define S14 22
! Q$ l% T$ G) z( Y2 F F5 X% ~* U#define S21 5
#define S22 9
5 C: s1 ^1 w! e0 r( Q( {- `$ p/ e0 W#define S23 14
#define S24 20
#define S31 4
#define S32 11
8 P' ~: y! s1 y1 M, E#define S33 16
; [5 b3 R5 x& A+ D8 ^3 y2 |% l#define S34 23
- p1 h1 O' I! [ m/ {4 w#define S41 6
/ p* j" V# C2 X0 @. ~5 P#define S42 10
5 w* q+ v) H0 f3 t* c5 [% w+ y F3 v#define S43 15
) n% q5 ^% W" O#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));
) S: h! D$ W; m' T; G+ [static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
" M( Q6 v4 s0 U" U( G. j5 ?' |static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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
0 s0 Z9 ~/ W) H, [% r: P( c. c) x5 v4 p};

2 S1 `$ h x7 X8 h/* F, G, H and I are basic MD5 functions.
*/
- V5 K# e4 ?. S S" q#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))
" A4 F# l$ Z" {' g+ s" _#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
: |6 q- P# a7 g: ^& I" j#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
1 x0 b# q. }1 U. SRotation 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); \
}
8 e2 r9 B7 ^6 R( f: o#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
# h1 V! m8 c8 ~#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); \
}

. K f* U) m* Q8 f A5 O/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
$ F0 H" ?) ^4 Yvoid MD5Init (context)
MD5_CTX *context; /* context */
' S4 z; @6 M) r# `{
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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G( K$ p, d! B9 d. n+ v/* 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 */
9 H$ N4 f, h6 G9 ]unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
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/* 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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