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
' L$ @4 M$ j! }, f#define S12 12
h( L5 u5 r9 {6 ~#define S13 17
#define S14 22
#define S21 5
: C8 r' c/ v8 g) ^#define S22 9
# p- _ H8 s( t4 S3 V#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
Q+ m- ]" w9 w% k#define S41 6
#define S42 10
, N3 o- r) Q9 L6 ~' o#define S43 15
#define S44 21
0 ]% w9 ?# C- o) P+ _- D( D9 k
( m2 v/ _5 A* T1 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));
8 f: ~& g& a* l# N5 P1 Cstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
7 r9 y \5 G6 ^4 x: ] Kstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

" \; n$ {( M/ e) vstatic 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
4 S: E8 t, ?$ S};

. s& V& V. L0 e: S ^/* 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)))
7 m5 U8 k0 t3 R+ p5 M/ v
! Q' O* J" M! B! v% q/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
( U/ q6 c7 J. f6 w
; h6 ~: [3 r6 r- T+ {6 x; d/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ N- @7 {; K3 ^$ QRotation 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); \
}
0 w+ p. P# V$ O" o: d#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

% t$ ^. l( ~6 K/ P: ?. }; E/* 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.
! G2 ^9 t: w* Q+ `! p*/
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.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
$ p, p) I( ^' O' U" d9 Funsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
6 V0 ? G y# Y
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
5 F" y% X. U6 _3 [2 v, t- x
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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