md5加密算法C++程序

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#include "global.h"
- s3 V6 R/ ^: N4 T: n6 L#include "md5.h"
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$ D. v5 h, A( o6 `- _$ Y, s/* Constants for MD5Transform routine.
*/
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' s! K( h6 x* ` K/ L h8 s2 U#define S11 7
#define S12 12
#define S13 17
#define S14 22
6 J- ^( e: ^0 X6 Q7 R" P; Q% g2 Y. F#define S21 5
#define S22 9
& H9 B/ w N. H) i' J#define S23 14
#define S24 20
#define S31 4
/ s: m% \# q, b+ O0 @4 m#define S32 11
2 S& S0 y. _: f8 A" q7 v8 `7 i4 I#define S33 16
2 L' }1 L" I' d$ ~- j& {#define S34 23
7 b- X5 \1 b. t d) c#define S41 6
% X4 o0 l, t c#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));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
0 j& t3 J; P+ j q5 D5 istatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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: n% q8 K) j" v6 _( fstatic 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
};
1 @9 n0 c* G5 \4 {
8 X% y; t y5 T' r! e, l/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
7 M/ c6 Z1 R" j3 K4 W6 @#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
; v$ h; s) W! p [% K1 L#define H(x, y, z) ((x) ^ (y) ^ (z))
8 o8 X; Q2 ~- S, l$ U6 c- H#define I(x, y, z) ((y) ^ ((x) | (~z)))
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2 G+ v }$ ]1 E, I, r1 E1 r/ L1 b/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* 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); \
}
8 ]) Z4 {7 y; B. Q& I) l8 J# P3 A#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
, z; G5 e9 \6 S6 `+ ^# L% ]! t" rvoid MD5Init (context)
MD5_CTX *context; /* context */
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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;
- r, u/ L' X) ~. e}
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5 d9 J# I9 F; T( m) r/ J/* 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 */
{
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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