md5加密算法C++程序

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#include "global.h"
/ L3 E$ Z) K$ I% E8 R5 {8 R$ k* n#include "md5.h"
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8 I9 | q' B' H* G, N: o8 [/* Constants for MD5Transform routine.
*/

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#define S11 7
# U1 O, Y, O4 K7 A: e, I#define S12 12
! N) Q, r4 h2 M A1 s#define S13 17
#define S14 22
#define S21 5
#define S22 9
% ~+ @+ R7 o- P#define S23 14
& z: H7 l6 Z# J* S5 [5 t: `* @3 H#define S24 20
# U) A2 i; B& l( E#define S31 4
#define S32 11
: U7 k0 F# E) T2 n6 @6 G#define S33 16
#define S34 23
7 `! o5 y1 ^8 }8 @' G9 H#define S41 6
#define S42 10
#define S43 15
5 x" t: q" H2 H9 g#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));
K u% \! f$ F) V7 d6 K4 R, Hstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
/ h& N+ M; V- P/ Ostatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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
2 u. Q, r9 @ T) i. B. m5 m. ] z};
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/* F, G, H and I are basic MD5 functions.
*/
4 L. p6 d; f$ W9 O: p$ M0 ]#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
6 |! R$ y7 W1 V) t& f0 v' s: O#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)))

h! E5 y# T. X8 V3 G/* 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.
*/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
! v0 Y1 Z8 K+ m/ Q#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); \
}
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- h/ `& s; ^. \0 O4 }* [2 w/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
' O, }3 [- J- b. y! DMD5_CTX *context; /* context */
, e# d1 y: t5 a' M{
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;
}

( q* w8 B* [- ?0 E4 d/* 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;

/* 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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