md5加密算法C++程序

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#include "global.h"
#include "md5.h"

/* Constants for MD5Transform routine.
*/

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0 V1 ^% X" k1 c2 c#define S11 7
#define S12 12
3 ^% A8 `* k3 l9 W p# `; P#define S13 17
" R/ D1 R0 f6 M) C [% E( l9 ~#define S14 22
#define S21 5
' O8 G# u, I4 d' o" }" ^% b. v2 P#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
( o% {4 w- G% K1 c6 }9 b7 {% P+ Z#define S42 10
#define S43 15
#define S44 21
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static 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));
a, |' j, {2 N' L3 sstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
/ ?% t6 j% B. m+ Z) B. s$ ustatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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; W0 J8 W$ f* T( Y5 J% mstatic 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
% ^- O- K2 |2 V1 q: \8 p};

b$ H. ?/ H$ Z/* 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))
" d# F) f$ v" Z z" [, k8 S+ D#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
1 k# d0 R: i9 G1 C* w3 b2 y#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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* ]2 _ R2 n; P9 I' [/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ a8 U8 S, a; N( q, P9 }1 k" u! c+ L5 \Rotation is separate from addition to prevent recomputation.
*/
4 k. o( x5 `- i, I% D# \: m) A#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); \
}
#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); \
}

. ]1 c3 c1 S$ p2 g- S( y/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
) p% h7 a7 e7 P. ?, s svoid MD5Init (context)
" g/ c* @+ a) w' x* JMD5_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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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
, D1 s3 b5 m) {8 _9 A: s6 V# K/ Hvoid MD5Update (context, input, inputLen)
- v8 |) e r9 s3 y- m4 `" pMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned 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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