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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#define S11 7
#define S12 12
* Q3 t. r; e1 A+ v/ K$ ~! B#define S13 17
#define S14 22
#define S21 5
& ^( i7 x1 \: p6 ?3 A9 ]4 C#define S22 9
#define S23 14
& K9 F( b4 e) V2 x0 Y#define S24 20
+ ? T* S8 Q3 q! [#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
+ S$ P8 A9 p, J" Y1 ~' [6 h#define S42 10
& |( D: J0 g, |; e. X9 B/ C#define S43 15
* |4 N7 W! C/ S# U#define S44 21
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' b9 Y* O. b# S" c5 O3 Zstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
* L; ~" j" a! c# w" B) _' mstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
5 P; R1 l& N- L2 m) Z1 lstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
% j1 ?' L$ m0 W6 T& sstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

& y; E. J+ h( o0 a; o H( cstatic 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
6 a4 F- b9 y, Y5 `+ ~3 k};

/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
% ~' L# a$ e3 I9 t8 v* D#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
& h4 O! o2 I8 R Y3 a#define I(x, y, z) ((y) ^ ((x) | (~z)))

, C5 r) N! O6 e9 ~8 V/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
$ p; j! ^* f, BRotation is separate from addition to prevent recomputation.
*/
Y4 p' F3 i; _# N1 m#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
" ?. n5 G q, M8 B# H$ E* I/ e#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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0 w7 m, w1 B2 Y' M/ a- ^) O% C% H* _/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
) D5 c; C4 q, Uvoid MD5Init (context)
MD5_CTX *context; /* context */
{
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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3 t3 W0 P- F) q# t' I% z/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
) B. i+ Y m$ O3 c5 L2 }) l9 G" h0 bMD5_CTX *context; /* context */
; h+ x0 d; M; x I5 E" Wunsigned char *input; /* input block */
2 T1 {- p; E% ~" n5 Bunsigned 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);

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

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