md5加密算法C++程序

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#include "global.h"
; b8 Y8 Y: H1 S8 x; p#include "md5.h"

- _. A0 S9 d; V' ]3 l/* Constants for MD5Transform routine.
*/

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#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
2 g+ g3 w( @) d; N#define S22 9
3 ^& i* \4 g$ O2 B" R: q/ b# {#define S23 14
#define S24 20
#define S31 4
& a: F* D1 A- I. [1 w, a3 s3 T2 Q#define S32 11
#define S33 16
4 |0 N2 ]8 j$ Z/ R: j#define S34 23
0 k# ^ Q; _' j+ e#define S41 6
#define S42 10
6 R4 N# |2 r0 W. G$ m. N) G6 v3 S#define S43 15
/ K5 h N5 }9 I9 S5 T#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
) A) r% {! c# s) s! E2 Astatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
. i* s* A2 l3 r, }static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
5 S0 W+ }9 A( Ustatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
, I, d6 ?, w, U0 `/ Z2 C: C- jstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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3 s/ z) T+ ]3 b/ T$ z) zstatic 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
0 `" ?) K3 J0 f' p/ ?6 S- X% N};

/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
}0 C5 ?# Q$ Z, s+ d#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
1 }8 ^' S' Y( x& Z* V( N4 O#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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- t; R* D# [9 w. u, Y( G/* ROTATE_LEFT rotates x left n bits.
*/
^" U S: [& w# X#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
( a: N+ |, ?+ n8 H/ O* r' \
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
9 p8 \/ ~" a8 q9 w; kRotation is separate from addition to prevent recomputation.
*/
6 A0 {9 y; B- ]2 A2 t+ H#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); \
}
% q! F; h! x6 {" 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); \
}
% @: h! l6 u' z; ^3 ^#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.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
{
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;
! p8 ?* x$ i1 d) k3 n}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
7 o$ d6 m X/ k( }+ ]MD5_CTX *context; /* context */
3 T) Y$ S& ]; }) n" O) X6 y8 lunsigned char *input; /* input block */
A5 {/ t" b4 m: x% ?- Runsigned int inputLen; /* length of input block */
9 c& _5 o r- a. W{
unsigned int i, index, partLen;
# U7 `' S$ }3 D% Q, z
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
/ f( J/ p4 v8 K# O9 Z' q
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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