md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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9 l7 I, F2 k) |. j6 t/* Constants for MD5Transform routine.
*/
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7 w0 l: D, y3 G, ?% K: b) N; @3 }#define S11 7
p/ l7 w/ \. M6 E% ^( V#define S12 12
- v Z+ n* B9 ~; H! R3 s* O+ T9 |3 `#define S13 17
* Z8 J$ v E/ P% t4 Z#define S14 22
5 b+ P: j$ B# Q+ a3 h#define S21 5
# Y `' j3 P+ s' x& o#define S22 9
#define S23 14
- a2 k4 w B: A% F# l0 ?#define S24 20
5 R4 E+ t$ P( ?/ P6 l: _1 H#define S31 4
#define S32 11
' q* a/ I, U/ L#define S33 16
#define S34 23
#define S41 6
% I/ w& v9 E5 O5 d#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));
+ E( }7 `0 M- ]# s6 Gstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

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
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/* F, G, H and I are basic MD5 functions.
*/
# d8 ]7 Z( _+ f4 l1 R#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
2 h$ {, H2 L( t4 e0 F3 {3 x2 `#define H(x, y, z) ((x) ^ (y) ^ (z))
! v7 u1 \5 b$ ? y8 {" W6 P1 l; s6 d#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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) H# M6 O9 r' E/* 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); \
}
( [( K1 ~; d; n9 f#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); \
}

2 I0 j) z. b( G9 k: U t" y/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
) ^1 J; q# r% U+ [2 Y3 P3 Q7 l{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
' M) r5 \2 B, U: ]' l0 R b F* n*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

h9 r+ Q1 v9 Y' U' Y' ?, \1 I, m/* 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 */
+ M: J. d! A! \( d$ Y b: |unsigned int inputLen; /* length of input block */
! d% v5 G" U$ _. Z; X0 H) P, V{
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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