md5加密算法C++程序

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#include "global.h"
) I& g, ?% D' w#include "md5.h"

/* Constants for MD5Transform routine.
*/

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1 F& ]5 U. r, z, ^#define S11 7
0 n9 ?' \, N2 Y+ A. P4 M; S! W( T9 N#define S12 12
' W- g6 i! n6 u% @#define S13 17
#define S14 22
#define S21 5
5 {* a6 S& J( c+ y' N#define S22 9
2 M* I/ q2 F2 G+ U/ |8 c% `#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
- P! j7 j5 V! v& Q#define S41 6
c' }( G4 s* s, D6 P/ d#define S42 10
- {# m Y O, Z" Z#define S43 15
/ b4 q9 @* L' ^# m. G#define S44 21
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3 p5 t( a' [" {7 J' wstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
. o4 \( _/ H( Z' `2 C( F$ J7 ostatic 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));
9 G/ O6 w9 `0 J0 u8 xstatic 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
& r4 K* j6 \: f& l};

0 |3 ^2 P& y5 E. W4 ]: R/ s* H3 I" 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)))
# @4 c" I6 B5 I( [7 y2 z5 X, P#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))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation 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); \
}
# [ ]; A$ j6 `7 H#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
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+ b1 f6 [. J7 z: n/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
8 f; T6 j9 J2 y' Z+ y* |MD5_CTX *context; /* context */
A9 j2 t7 `' S. m; W) ]0 b{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
. [6 P3 y, }/ m*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

4 s/ @( _" t1 a, V& w5 B# q/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
' b( ?( G( \9 B b: k5 }2 _0 gvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
) g) G$ S( C5 z' P; o1 Iunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
' U- }2 p3 g2 T+ B{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
7 H: n2 K( _ `( k: w9 k& [. }
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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