md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/
; H$ p/ L7 T8 I! v. ^0 N, p8 A

#define S11 7
#define S12 12
9 X. E- }. p+ M I% q" h; s#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
' n# q6 l/ J1 I# R0 Z* _#define S24 20
7 N7 g u( Q' }# u* c( O3 Z( x#define S31 4
#define S32 11
; M% @5 D/ _$ Q5 F. I0 h3 u#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
4 e2 o4 Y; d3 P0 Dstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
5 U1 v- J( b& Istatic 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
};

/* F, G, H and I are basic MD5 functions.
*/
9 R! ], g. F: a b7 J1 i! c- ?+ M% u#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))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

, J# `' T9 x& u; l) u/* ROTATE_LEFT rotates x left n bits.
*/
% v& @3 i3 b. |6 r1 u#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

1 d0 |, E9 d1 G( T. J* e+ q/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
+ v- s3 h) x9 o* f' h: L#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
$ I. `. m4 Z4 D+ O3 ]0 ^) |#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
, e- s6 s9 w p; v/ V#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
% y: T# X$ H) I3 |
! z& r, F1 B0 ^2 p* e6 W/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
. j+ ~+ w) W2 B3 b, J: Gvoid MD5Init (context)
6 ?* T: F5 _' ~6 Z9 r2 S: q$ q( wMD5_CTX *context; /* context */
+ i) T: {- h4 K{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
% i/ ~( H* W0 R. D. V) a# E*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
. k2 C/ g, O k2 @" q. e. 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 */
* { ^7 H2 X1 [. w0 lunsigned int inputLen; /* length of input block */
" f+ j3 o# |* o8 e4 ?; e1 t* s6 ~# {{
unsigned int i, index, partLen;

/* 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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