md5加密算法C++程序

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#include "global.h"
! I+ N K1 H! f#include "md5.h"

! V7 `6 @. w! ?" ?4 y/* Constants for MD5Transform routine.
*/
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! u7 d9 z! t# E#define S11 7
( m4 r# S* u @2 [* b. ]. `1 n3 I y#define S12 12
#define S13 17
) n) S. c$ C4 E) S# o4 u#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
% R' ~5 E$ g+ @" B A#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

! v/ V" |4 F& n' V% u1 e Ostatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
6 C3 G+ n2 O. m$ Y; t/ Xstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
$ W' Z/ [: T' t# [static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

$ b3 N& z' ?: l0 astatic 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
};
+ C' I6 `5 }. P7 Q
. i/ D% m W8 D( ^/* 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)))
2 X2 Z& q y0 \#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

5 ~: N7 ]' T* K7 H1 {/* ROTATE_LEFT rotates x left n bits.
*/
" E# ?, V; j% ^#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
0 o# s' I" x3 i1 r& Z7 T JRotation is separate from addition to prevent recomputation.
*/
5 m2 t9 r! s" {#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); \
}
% g1 K7 u" P! O0 J! t( {" N#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
9 u" j* F9 A1 P) o) b' d3 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); \
}

4 Q, r& B, N* D/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
) H3 @1 ^. B+ A+ o- `MD5_CTX *context; /* context */
2 v! N5 k3 j- y+ O Y7 i{
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;
}
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; c. }3 W/ T+ y' M" s/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
& G4 Y! T; _& k2 y0 aMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
& @* B4 Q/ u; h+ z0 S" D{
unsigned int i, index, partLen;
) Q( ~* g9 u% d
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
- b+ o5 p% K' f1 v
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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