md5加密算法C++程序

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#include "global.h"
7 g3 P( B9 b# H" }# q: R9 b#include "md5.h"
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' A/ L& p1 ?! w6 }8 h/* Constants for MD5Transform routine.
*/


0 c8 Z. E, i, V+ l* K" { O#define S11 7
) @; j9 d* T. p q& b9 S#define S12 12
#define S13 17
; d( p1 F# j4 I; s9 x#define S14 22
3 Q8 C$ D Y1 s" J3 |#define S21 5
#define S22 9
8 {6 t! c9 X( { [ H4 O8 \#define S23 14
1 C2 F$ s/ l8 H#define S24 20
#define S31 4
#define S32 11
" Q. z" I& _" t, y3 ^#define S33 16
" ] n5 D- q+ [#define S34 23
#define S41 6
" |# ^ V: }3 v# p#define S42 10
8 x+ Z* A4 W* X#define S43 15
2 e3 b. y% p( O#define S44 21
2 j0 S9 M1 ]9 f. z
& ]; @/ J: \+ D! lstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
2 u! D9 c+ W d# Lstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
2 U& t8 _- r# B. q( q% g- @2 vstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
9 k9 I2 ~# ~/ K3 U1 C; q2 u: Zstatic 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.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
% A3 W; n( c& Y* I#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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& F; P% K4 G" n/* 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.
3 }7 A4 ^" E+ e4 }/ x9 f% wRotation 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 Q" A1 C& Y" K. ^; h9 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); \
}
1 R9 R0 i, } k7 d#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.
*/
void MD5Init (context)
& W% ^2 U5 k4 p$ x2 o+ n5 VMD5_CTX *context; /* context */
* F4 E, z, f2 y$ L2 K8 K. Z, |3 _{
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;
}
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/* 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 */
! s7 L3 m& P" g0 V* P& z2 K# dunsigned char *input; /* input block */
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);
* l* e9 E* ^: j% q4 @/ [
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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