md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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1 {3 A% i: T, G#define S11 7
! x0 Y$ x; q5 o' p#define S12 12
" M" r2 B; _0 ^/ b5 r#define S13 17
6 I% V7 O8 x6 e/ Q4 z: s' V#define S14 22
9 l7 @9 b' Z6 N+ |& r#define S21 5
1 f$ N i, m2 R#define S22 9
/ J, i" T+ v. L& @; |5 e#define S23 14
#define S24 20
#define S31 4
3 F: C _$ u- J+ x6 _3 D d#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
* d: g% k% a; [7 \#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
8 U+ e8 y1 w t2 Y7 Gstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
4 H: R/ Z+ v, a* R1 h; b9 e3 _static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
# |* u2 N" T+ {" e* k2 cstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

6 c N' d' I% d9 Y4 T6 A! `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
# N! d$ [8 U- n1 s/ `) t: R3 @};

, E* S8 I% g* p# k9 J/* F, G, H and I are basic MD5 functions.
*/
) _% @" o& J2 o7 j' P" k! b#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
+ r" t+ U& D6 {#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
3 K; c2 k7 f0 \ p. ?! e#define H(x, y, z) ((x) ^ (y) ^ (z))
8 y% m a! C! s4 i% u( k0 I#define I(x, y, z) ((y) ^ ((x) | (~z)))

2 z- j! d: Z: `# J, R/* 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.
Rotation is separate from addition to prevent recomputation.
*/
# `5 ` P9 i5 O# Y3 t* }#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); \
}
% P" M7 v& b Q( ~4 p3 T#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); \
}

9 o! c- h& U* O. q" t" X9 l4 v/* 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.
0 p1 K& U2 u' Q6 v* F*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
5 W& P+ Z8 P3 @: s}

s+ Z# E: ^4 I: [/* 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 */
0 ~- w9 }- j4 g. _unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
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/* 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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