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
#define S12 12
#define S13 17
& V% {) o& _: s6 \$ v#define S14 22
#define S21 5
4 |0 e! U$ Z. b, I5 ]' F% L#define S22 9
#define S23 14
#define S24 20
/ n, @* {* b( c! U) E: I#define S31 4
+ Y8 [& C7 Y1 Y2 F#define S32 11
+ O2 q$ y- u& k2 l#define S33 16
#define S34 23
2 N& y# J- A8 C6 S; ?2 G* D2 @! W#define S41 6
/ j: ~: X. \4 q' Q, B#define S42 10
& G5 i$ U- }+ j2 d#define S43 15
) L {' ~. k, F6 W9 U j: w% V#define S44 21
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/ l% A1 _5 Z! p) \0 N8 nstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
8 c7 M$ D( T8 W* a1 J& Astatic 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));
; v7 h( Q$ s& O; Qstatic 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
7 d0 ^2 `8 D R! Y( B3 V; C {% f};
. C/ H/ B( f: Z/ Q
( R! K4 h- t C" [/* 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)))
j6 S% [: M& j( L+ P#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

. k, {# R1 L) T8 L. y/* ROTATE_LEFT rotates x left n bits.
*/
' J+ [7 w( I; O T7 A, Z: h2 n: R#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
n! d- f* a( D3 n; U2 X( c: s
+ L, u7 e2 [9 L; F/* 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); \
}
7 T7 R: G0 c, Q3 u% \: 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); \
}
6 j- O6 S% w% A2 G6 ]8 r#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
5 L- f$ X: E2 f1 }; V
# _ o! x* @4 w/ \( {/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
- x e9 Z7 S, `3 \void MD5Init (context)
7 P: K! L$ K: L6 x* h) mMD5_CTX *context; /* context */
8 q2 J/ L6 t; P4 V{
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;
}

( Y& x r. Z! P5 Y- \/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
7 s* i, z; I+ ovoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
1 I% c8 u1 R. D# d% L/ \8 {unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* 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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