md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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# _+ |' b9 Z- f% Z
#define S11 7
#define S12 12
#define S13 17
5 ]! ]+ z5 y% M2 t#define S14 22
#define S21 5
) F' b3 T2 }& @& }% p* R5 i( a( r#define S22 9
+ M9 @! X7 `1 x' [3 Z#define S23 14
#define S24 20
#define S31 4
: u. x) F* m/ n7 |1 j0 G#define S32 11
" {' f% r) o5 ?/ a( d$ }2 K#define S33 16
#define S34 23
6 x; b$ S' z) j#define S41 6
#define S42 10
t6 S' d- L- U7 X1 j#define S43 15
#define S44 21
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" n. |/ ~9 {9 Y: W/ {% T0 Xstatic 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));
% v! F1 r1 [& s3 a2 Istatic 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
};

/* F, G, H and I are basic MD5 functions.
*/
2 E( T9 l9 J# T0 p9 s; Z#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
9 u% I7 `' M4 D0 k0 l& J# e, H#define H(x, y, z) ((x) ^ (y) ^ (z))
& W4 c5 A8 `3 ^2 h. P#define I(x, y, z) ((y) ^ ((x) | (~z)))

1 e) g) I6 j' f3 O' y% u( Y/* ROTATE_LEFT rotates x left n bits.
*/
; S0 x# v% b2 {! l7 D, j8 I#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

; _3 i$ y% t; D# u) X, r* e I/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
" R @9 Y$ z" _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); \
}
#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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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
5 }/ g6 a9 z" GMD5_CTX *context; /* context */
1 _$ S% c7 L/ r* j{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
$ H* Q2 l7 b9 w5 V* ~5 q0 N*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
7 J- K; l B+ I6 @}
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8 i: d. T: p. N/ b/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
% k; G: t0 J; D0 Ovoid MD5Update (context, input, inputLen)
4 k. W6 U* _$ _& X' wMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
x5 c% H {7 i% o/ p{
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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