md5加密算法C++程序

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#include "global.h"
#include "md5.h"

. l j9 o$ R1 L3 y' T. D0 \ }/* Constants for MD5Transform routine.
*/


+ F8 q; q" S! m/ K# s9 b1 v0 n5 e#define S11 7
#define S12 12
#define S13 17
( v9 M# B0 J/ a$ X/ }+ W# D' M#define S14 22
2 y0 G, h+ a0 d+ a2 C3 Y' E6 x/ J4 i1 S#define S21 5
: N& ]4 T% y0 y- @6 E" I7 L#define S22 9
#define S23 14
) Y( i: x) O$ N0 n#define S24 20
9 f6 R: ^, f: D- i. c& }, r1 }% d#define S31 4
#define S32 11
#define S33 16
#define S34 23
- h& i4 d, }! S; k#define S41 6
#define S42 10
#define S43 15
#define S44 21

8 z/ G* t1 j/ ]- G: s# mstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
; M7 t# y% x6 M' r2 d- b) J+ Zstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
! ~( F2 Z8 u% t6 {& ~static 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
/ B- Q: a) b2 Y0 }- G, e};
0 p8 \# F2 I* }, G$ [( e4 G1 v
/* F, G, H and I are basic MD5 functions.
*/
4 }' W) x- Z+ M( D#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
4 i3 u; I# @2 k! H#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
" u+ [ E6 l4 @/ l#define H(x, y, z) ((x) ^ (y) ^ (z))
4 z y) z$ n+ B+ P8 D#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
7 i7 t8 _$ u9 I% ?#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* 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); \
}
7 u; {4 B3 k4 d; X#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.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
{
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.
*/
7 ]8 T( c. y X( ^void MD5Update (context, input, inputLen)
9 E2 v U# N [MD5_CTX *context; /* context */
unsigned char *input; /* input block */
3 [4 [- N7 T X0 t0 b/ Gunsigned 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);
; f7 `& [) D+ t; ~ u& z
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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