md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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* u3 Q c" X7 g9 o3 W/* Constants for MD5Transform routine.
*/
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9 y1 [' d" h! J#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
# n) r& m/ P6 N3 O#define S23 14
#define S24 20
#define S31 4
#define S32 11
4 e- ? c' f& K6 ?" K#define S33 16
#define S34 23
W3 B- @+ S- @. i7 j#define S41 6
. s( o# z R2 F#define S42 10
#define S43 15
. `1 `" m( z+ c _#define S44 21
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. E7 J0 {% Q3 f8 _' k7 q; Istatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
$ t2 P7 Y; m4 \7 t: d8 V5 N+ Kstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
7 G" J0 B7 X1 r: pstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
. e `+ }) g3 q5 R. kstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
& ^5 ?; U& B: T z( mstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

0 m' ` Q5 q9 s9 Gstatic 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.
*/
; H2 }( W- h& }! r% G#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
( m+ d+ s) e' v#define H(x, y, z) ((x) ^ (y) ^ (z))
, z3 q; M) z" e: k3 {* l1 @#define I(x, y, z) ((y) ^ ((x) | (~z)))

% T+ j5 ]6 e! W0 b/* 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.
1 O; m/ }5 y3 `6 P" vRotation is separate from addition to prevent recomputation.
*/
5 `. g* w L0 A' D) w9 d I P; u+ h Z#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
3 c/ I" c' j( Q: y, Uvoid MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
6 f3 f& Z- G0 e" b$ d2 q*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
P9 z, q, ~# g7 R4 |- |}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
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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