md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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1 V" h: ^( e8 n/ _$ Y/* Constants for MD5Transform routine.
*/

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#define S11 7
#define S12 12
#define S13 17
#define S14 22
% e1 q5 }5 \/ [+ M# |#define S21 5
- x& p1 o& }( K#define S22 9
! R; @$ b, F7 O#define S23 14
" q8 _( x$ j( G# Q1 \1 a#define S24 20
#define S31 4
: J! e8 e2 C* P1 L- o+ a- {#define S32 11
7 X& k- X( I+ j$ Y: T) x#define S33 16
. i) a! T3 x6 A& |8 ?9 k. d#define S34 23
#define S41 6
#define S42 10
#define S43 15
7 \+ o# X$ C3 l/ L4 R' s% j#define S44 21

* H+ w( o9 A7 ~static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
; s- q' w& p) N0 b9 fstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
' i' t5 ^$ W/ I% \static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

4 a* r* S% D# O0 s/ [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
$ N2 e9 F) {4 z8 v/ O }};

/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
8 A4 N/ N8 r: E: D" v4 N- Z& g3 e/ G#define H(x, y, z) ((x) ^ (y) ^ (z))
9 C' G, g! v% a( c* ^#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
" d8 L Q& h0 K0 Y. m, v#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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0 e$ Q, m2 ^/ ?: Q5 n8 u, ?/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
" _2 g* @ {! D4 r& uRotation is separate from addition to prevent recomputation.
*/
; I9 ?( M8 O6 _) [- p$ ~#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( s2 d6 |8 y8 A [" i#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); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

) E+ u, G E5 X2 c! r; w, e/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
) s2 T) \/ [# d) w3 s/ Gvoid MD5Init (context)
MD5_CTX *context; /* context */
+ F" I3 Y6 e4 j5 u7 d{
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;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
/ |8 ~+ j3 B2 b" Y6 c0 XMD5_CTX *context; /* context */
unsigned char *input; /* input block */
' N2 P: d! v7 M \3 |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);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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