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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, c5 y7 Y3 S" S3 J+ E#define S11 7
: t! v. B2 j2 l e# m2 s8 O#define S12 12
#define S13 17
#define S14 22
, \" [. g6 {$ @#define S21 5
#define S22 9
#define S23 14
* f& t7 C3 @8 o1 a: K# V/ r5 ]! D#define S24 20
% `1 l% r: R7 _ T#define S31 4
& Y/ Q3 f/ Z. {2 R* W# R#define S32 11
! K1 s2 D; M* s7 ~4 F" ?#define S33 16
#define S34 23
% F: k) H) L, l& R#define S41 6
1 }/ y, W& O- p( [2 {, @( r* i#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));
* y7 P, ?( o7 ]" P* w8 k; |( Xstatic 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));
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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
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/* 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))
/ E9 L4 ]9 M a2 G a+ U! s#define I(x, y, z) ((y) ^ ((x) | (~z)))

' F# W& {2 B) l/ q1 H* r: z/* ROTATE_LEFT rotates x left n bits.
*/
" b- a: k, F' @/ o#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

1 }. J: K2 X1 Y0 A9 a2 H/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
* U2 t& u, S U0 E* s& U: h2 rRotation 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); \
}
- U1 m q7 A+ n3 @. x: M#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); \
}
: ?" q0 R5 V! I, O6 U+ Y#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.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
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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;
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4 N" D, G; w( [2 |/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
8 @" x4 j2 g1 G8 X) U1 O, q4 Avoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
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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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