md5加密算法C++程序

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#include "global.h"
8 {/ L |, V5 j$ n7 z! s#include "md5.h"

/* Constants for MD5Transform routine.
*/
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* I* G$ I+ l9 e- N% n3 G. D#define S11 7
9 }- j+ {/ u0 _% Z: `2 _#define S12 12
#define S13 17
#define S14 22
/ z& ^7 q& \- e3 o2 z2 A#define S21 5
8 D: ^" p8 c, g( _#define S22 9
3 I- |. d1 H* k( I4 G# e#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
: E; a& S- u# {$ D* b#define S41 6
#define S42 10
: B7 P6 `! h d3 @#define S43 15
; {: r2 h) D* u#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
7 _7 \9 Z6 h# pstatic 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
1 e' K" S; z" A};

/* F, G, H and I are basic MD5 functions.
*/
! t( g p- a- J2 T8 d# e#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
, F$ v, B9 |# O! C6 F#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)))
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& i2 e+ B4 J& M- [- U+ y( o9 q/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

0 d) ^ C9 O/ D' ^; W/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
7 k! h7 g2 ?8 i) k/ z9 PRotation 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); \
}
4 A3 [" [: U, I* S/ g#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
8 K0 V9 @9 _; `( B1 c1 f9 K2 Svoid MD5Init (context)
5 C' h, k& R* UMD5_CTX *context; /* context */
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context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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& V9 k( {: R' c4 E9 }/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
/ X5 e3 P; P" D: lvoid MD5Update (context, input, inputLen)
0 m. r4 g0 a- G4 G" |/ u, nMD5_CTX *context; /* context */
1 `% x/ s) G' ]$ u% C9 M! bunsigned char *input; /* input block */
1 \2 a0 a8 r. p3 M' \0 W/ junsigned int inputLen; /* length of input block */
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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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