md5加密算法C++程序

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#include "global.h"
# Q R: j! ~) X; f8 g#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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#define S11 7
6 j; I+ I- {; b4 o#define S12 12
! _" @$ t0 f- N7 k4 j4 W6 z6 n5 J#define S13 17
#define S14 22
. `4 P# z% z7 r2 q5 k8 J; v4 w#define S21 5
: E" v6 z/ h3 D4 Z' |#define S22 9
#define S23 14
$ ^ A' }/ d! a& R! ]7 E! b- g#define S24 20
#define S31 4
#define S32 11
) F8 y3 v) `7 Y#define S33 16
* q2 ~6 r! @; ]5 g1 u( B#define S34 23
#define S41 6
1 I" ~% C; ~! U5 I7 ]#define S42 10
! N. d8 f9 j t$ f& `8 Y#define S43 15
1 k6 z, u: k$ a7 } L+ a) H7 }/ h) U#define S44 21
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( V) L* O6 T: Q, f: rstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
9 L4 J% l# o# I8 Tstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
/ A8 u* x" x Q; V5 g( Rstatic 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
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/* 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)))

" X5 O- Y6 [! z4 w9 l8 A/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
- q- N- v# i( e ~$ v' J#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
4 |+ h) W0 A! M4 Q& H6 m#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); \
}
1 J/ F: E: F/ z3 j) 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); \
}
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! ]* {2 I7 C9 t8 |/ p- w/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
# d0 [) z% P% e" C% R8 G4 Hvoid MD5Init (context)
- }" c( X# c0 o! a8 F9 m3 i# g% @4 {MD5_CTX *context; /* context */
6 j) |& Y' J* U$ F- x{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
, F: m% f8 i6 y# z, W3 H: Q8 ]*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

E. X8 |9 N7 d9 Y/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
1 s& q, M; o' v! @! P. h: rvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
; i5 X& w! E# D9 ounsigned 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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