md5加密算法C++程序

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#include "global.h"
! | O) m' V+ D6 a#include "md5.h"

/* Constants for MD5Transform routine.
*/
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; A4 m2 k% _& ^0 |, z8 w#define S11 7
* n+ b. w* d7 F0 N0 q#define S12 12
4 X* i2 e$ F& X9 u#define S13 17
5 O4 m. T! Q% J% \+ K#define S14 22
) t4 \( y# s" b+ X0 W#define S21 5
, J$ e' F1 i) T8 F$ v$ ?#define S22 9
#define S23 14
$ y, C( O+ @- x#define S24 20
( |9 H5 j! T( U; s2 w' J#define S31 4
5 a. G4 T. J4 f#define S32 11
#define S33 16
#define S34 23
& U. r+ C, F2 _7 o' n$ r3 W$ ], X#define S41 6
5 l! D. Q1 f$ q& `#define S42 10
#define S43 15
#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));
3 m+ a) b+ Q, T! Z6 f/ Ystatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
4 J8 x- T2 u# N; ~static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
8 e5 S- E' B) N" C" n- g" mstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

B( o" P L! d U& w6 ]# I+ L jstatic 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
- \! _4 j: j5 g};
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/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
& X7 M- m# W' |5 D; B: y% y! Z#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
2 L% V1 v0 K4 F% o" N- O#define H(x, y, z) ((x) ^ (y) ^ (z))
; d+ J$ X J& Z#define I(x, y, z) ((y) ^ ((x) | (~z)))

4 l# |" l H0 j1 j/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

% e% P$ f) O) `, T/ O# U/* 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); \
}
#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); \
}
5 x$ S+ {! B1 L( _; l/ 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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
n% S7 ]# ^9 Bvoid MD5Init (context)
- r. @! `( K4 Z: TMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
0 n( b9 T" h2 h( O& [1 T. t. x*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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% ^$ c% S$ I2 h5 F5 Z; {" {9 @" u/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
5 Y/ R0 \. H J5 o9 M% }. GMD5_CTX *context; /* context */
+ I3 N3 X, A' j. ^9 Aunsigned char *input; /* input block */
2 G0 Q2 e6 i. N2 ~unsigned int inputLen; /* length of input block */
( ]. W% T8 A& m$ K/ o+ @3 |% ~{
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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