md5加密算法C++程序

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#include "global.h"
9 ]7 G# k0 } M0 |0 t4 E; p' y#include "md5.h"
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/* Constants for MD5Transform routine.
*/


! T. V! ]5 E* V0 v% V( ^#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
4 W/ I9 A% v0 t0 c! X#define S22 9
Q! b! k/ R4 P#define S23 14
#define S24 20
. y& j _6 j! [( t3 k0 B1 {* B#define S31 4
#define S32 11
#define S33 16
#define S34 23
9 S* p4 O. A+ x$ v$ c7 v) C#define S41 6
8 @$ `3 {: x( B+ Z3 t: m5 A9 }#define S42 10
#define S43 15
' Y) A) g8 Y/ J0 l6 `6 O+ c8 ?#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
* o8 _+ x/ W, I8 U$ ~ c. X- H2 y- estatic 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));
3 `/ C, ^8 T4 v3 Fstatic 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
4 M! v: y+ h4 P};
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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)))
3 e4 o' c& r1 M# f, {#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
5 k- |8 p h* s#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
! g u' \* q- k, ?/ F6 bRotation 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); \
}
8 N4 Y) |" z7 G3 V#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); \
}
8 \. Z5 E" @# R2 x5 j9 Z#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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+ N' J X/ o' ]7 {/ M# H: X/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
3 M5 @/ z7 R+ t, H. m( c7 }{
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 L, n @$ N7 n/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
- k" s6 b+ n2 ~0 @void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
" M4 ~# t- r& c7 q1 h# a1 t. M) P2 h ~unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
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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