md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/


#define S11 7
" V) M8 q) S/ j, J3 K8 h% ~) E: M#define S12 12
- O* A/ j" N4 a9 E- s' f" @2 w#define S13 17
6 l) ~1 x) Z2 S. D. k* D#define S14 22
8 c. b1 h! d' h1 M6 ^#define S21 5
r9 J+ ~6 X$ O/ N% [" ]# j#define S22 9
#define S23 14
# x4 ?/ |& G. i( b, \- t0 z2 \9 F8 @#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
% {% Y2 k4 T* I! r! W5 w#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
1 s3 ]8 \, V, Y" y) O' rstatic 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));
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
# W! M; G" K' N0 D7 M, t4 e};

% E+ w) Z& o0 M' e: g* b/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
4 h& k! y& U6 V! K" I C9 s#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
2 K! F$ O& Q6 o7 c. T+ p* e#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
# }; M7 E9 u* M* l
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. ]8 S+ e8 T* t# DRotation 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); \
}
#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); \
}
* J9 L$ C, U$ s( l6 K#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.
+ B) }8 b" N& |% E. [4 k*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
2 c/ r7 K, ~; X: i1 v3 o' Z}
: D- g& \2 t! i, F& d2 Q0 e
% I7 c/ o4 u. O9 V, l! S# s! v/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
* |5 h! o( [ z# \- r9 cvoid MD5Update (context, input, inputLen)
: U# {/ e m0 \MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
5 }& |) \! t/ M) I x{
unsigned int i, index, partLen;
1 h3 ~# K0 o' D+ ?
/* 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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