md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/


; Z. D+ K9 v1 ~#define S11 7
; P+ N9 }4 ^2 X' ~8 T P& j1 z/ m#define S12 12
% c# M9 L8 `2 y) _" y- S#define S13 17
8 A F: O; ?3 v! C8 \, n$ J4 C3 G! S#define S14 22
#define S21 5
#define S22 9
/ B0 K* c8 c c3 l; e" r#define S23 14
#define S24 20
#define S31 4
& Z' P( w Q7 |! Z; @1 o( y" a& J#define S32 11
7 @/ [$ m" s5 I: ]9 a; i, Z: A' y#define S33 16
#define S34 23
5 R% q8 P) e- u2 D#define S41 6
4 v6 M" }- W+ {7 s#define S42 10
1 ~. b% X' A2 r+ m+ v3 s" _, ^#define S43 15
#define S44 21

+ a7 E; g \; I# {; l6 Z3 K' J/ Bstatic 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));
# b' U" t! d" Q/ M5 _; t9 Ostatic 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
3 E2 m" E6 D$ R};

) R! F2 z9 R4 B: y/* 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))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
& E% H6 v6 ^! u7 n#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.
! H& Q d- V7 |* m5 [9 v1 o" j# GRotation 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); \
}
9 z. G" C( v5 f$ W; @( I5 ^3 |5 V#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); \
}
~7 c3 j$ @: x0 d' l- r% ]#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
0 b* f7 w$ l8 s1 C; O( G
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
. | [" M) V+ F3 u" H H+ Q. Ovoid MD5Init (context)
& H5 h* E. Z$ H; w! O V" N- o$ j, XMD5_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;
+ c" K% A- ^0 v" n" G}
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& R$ M+ c% q# ^6 @, g& `$ w/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
: R( p$ k4 t# W$ mMD5_CTX *context; /* context */
" c% S( u9 e) V) f; q1 [) m. runsigned char *input; /* input block */
6 t7 z$ g2 M$ b j. d5 Y6 sunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
/ ~( T# w4 U% r* Q0 q
/* 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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