md5加密算法C++程序

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#include "global.h"
2 x4 O7 k' v1 O) m' Z8 _#include "md5.h"
3 ]& {4 _5 `# v; W8 Q
( h0 h7 G Q, k% |/* Constants for MD5Transform routine.
*/


& [" E7 Y. ~" @ m#define S11 7
) \0 r$ }' k4 [1 j#define S12 12
#define S13 17
' r9 n$ {7 a" e' w#define S14 22
5 E2 [# r1 k1 O: H, Z#define S21 5
' v/ r1 O0 l5 P4 U/ c#define S22 9
#define S23 14
* K# ^" D" e+ j. z2 B#define S24 20
# r" d9 `! K @, f. I! l1 C4 j, `#define S31 4
#define S32 11
#define S33 16
( y! e( B- M# t9 `2 {/ @" @#define S34 23
#define S41 6
#define S42 10
% A8 u& q! I; J U#define S43 15
#define S44 21
) h6 m% q& f* r( I# j
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
5 V& @- P ^+ I9 e3 Y2 cstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
0 e3 ]. _- c6 F5 R. j% qstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
, z& Z! x1 j, Nstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
4 \- P5 w6 ~/ G8 e; `8 [' R' {
6 M9 U- A) P9 k' _# }: o% ~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
9 i8 p4 q( o. d! V# Q" f! x};

3 v! w! t- t& @- g$ a/* F, G, H and I are basic MD5 functions.
*/
9 _1 K/ m) C, W+ A: f#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))
% E2 v- G; A/ S0 O% [; Q0 f& Z# H. h#define I(x, y, z) ((y) ^ ((x) | (~z)))
$ B* w5 B) Z3 e1 G3 a/ b* c
/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

7 G: S( [; V8 M& S8 z/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
5 A& D& f8 S) i# B+ }6 }4 Y#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); \
}
( z9 y, k0 j, D#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
% }+ m3 _* \* z' ^0 F#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
' }) k1 N( B1 a; V" h
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
) c: B, h( A' X; P. d) q% bMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
c$ d6 Z4 F- m) v*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
' H6 s$ g# K3 D6 c) @" H3 m}

/* 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 */
2 h$ g1 X# N8 M, t; `5 e; Bunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
5 G5 E( j% `; k% P
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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