md5加密算法C++程序

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#include "global.h"
4 ?, V+ g, I5 T#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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5 p0 P1 M4 j/ e% X7 k#define S11 7
6 ?+ j3 D( ^; J" W6 d5 b# G#define S12 12
`* s# X. t7 U( w T+ |#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
% O5 E' k' D. b5 @1 {% n#define S31 4
#define S32 11
" s# c3 V% L" `' n+ K6 @#define S33 16
9 U7 ~1 j- w% g3 t" B0 E) [& m( n, [#define S34 23
3 k" A6 o+ X6 v% C4 B0 S& `#define S41 6
+ j6 a: P3 X, Z8 w#define S42 10
( ~8 t7 s$ S7 V/ A% c+ U* U- r5 E#define S43 15
. z7 |& G0 k" W$ V& r6 Y: i#define S44 21

3 L5 @2 d1 i) I' y& W; M) Cstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static 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
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/* F, G, H and I are basic MD5 functions.
*/
4 n: O% j1 x4 R. p7 G& B#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
, l$ k# C5 K6 d& j8 M8 Q+ g: d. K#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
3 D5 j$ T# r( H2 p/ Q9 K, G#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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: Q# }4 a0 i: v6 ]/* ROTATE_LEFT rotates x left n bits.
*/
2 }% F" I$ v4 B0 t j, N% z#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.
*/
3 }8 C- C# j/ W#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
% z6 a8 [$ ?* U& U#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
& H( A: n8 ~3 n( ~/ ]8 M#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); \
}
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8 p& V7 A: i; p3 j/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
" n% Z! o5 e; Z" w! Dvoid MD5Init (context)
1 @. y Y9 H% k ?8 f3 o( NMD5_CTX *context; /* context */
{
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;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
8 _0 _. u& W2 }4 ?* q1 n+ l5 CMD5_CTX *context; /* context */
- v. z6 N" y8 f- d8 O" T7 @unsigned char *input; /* input block */
% a) u2 S3 S0 x: n1 Cunsigned 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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