md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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0 S' @6 i: @- h) \/* Constants for MD5Transform routine.
*/
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/ I$ c/ `+ O: \# d$ O* B#define S11 7
2 n9 o4 J% b; V% l#define S12 12
#define S13 17
#define S14 22
. F; P/ V% N0 {0 ~. T, {#define S21 5
" ]; [8 i5 E2 M4 K3 ]#define S22 9
#define S23 14
#define S24 20
8 P; b8 J+ H2 s+ X" ~#define S31 4
& ?3 g T" F$ X* `#define S32 11
#define S33 16
#define S34 23
2 M6 r6 G: \9 ?' j- s" [2 h0 h#define S41 6
#define S42 10
2 p8 {( k; `8 q" `3 ^#define S43 15
#define S44 21

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));
g6 l5 m3 j2 `* }2 ^5 Lstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
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
};

[6 ], W+ E( s0 t; y! y1 G3 e/* 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)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
6 d4 Q) b8 U! |$ S% j4 k4 k9 e#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))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
4 i2 g3 A3 V( Y' C U. nRotation is separate from addition to prevent recomputation.
*/
. l2 s x3 {1 K4 [#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( C4 P% m( |3 C0 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); \
}
#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); \
}
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/ t2 w. w1 {) Q D4 d0 {4 L4 ]/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
3 K% p3 J# l6 X0 D9 Kvoid MD5Init (context)
. u- U+ ?+ m9 ]8 q$ EMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
; X5 m3 r2 p# t}
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
, Z f' c- ]; H& {3 hvoid MD5Update (context, input, inputLen)
; I2 P C; t& X9 h7 d8 VMD5_CTX *context; /* context */
0 G! R1 q$ x4 ]/ G5 C' Cunsigned char *input; /* input block */
3 v) E C4 }5 E2 ]& \9 Vunsigned 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);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
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