md5加密算法C++程序

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#include "global.h"
; q; K# ]& R( X3 j#include "md5.h"

/* Constants for MD5Transform routine.
*/
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- h. J6 Z$ C* l( l2 P9 h#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
* s( F, z* w( n& ?7 O#define S22 9
) Q! D; _9 v( `#define S23 14
. V/ u, c q* d2 E0 T#define S24 20
#define S31 4
U, _4 v# Q+ y#define S32 11
#define S33 16
#define S34 23
1 K9 {5 C8 _# q* K; e! c5 A" L0 H: B#define S41 6
% M( R% B `2 {#define S42 10
#define S43 15
# g0 B M, D) U/ |5 b#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
' P7 W- I, N( t) ]4 B6 E' jstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
S/ h/ [# G; V. C" p V3 Ustatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static 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 F [+ J9 X% B. u) ^#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))
" c. n+ ]: L4 O) z4 F( w- ^#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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" k( f# K% }8 X1 A1 Y# S3 I$ C/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
4 x; [* W# R$ ?Rotation is separate from addition to prevent recomputation.
*/
0 {- k7 Q+ F B3 ?#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
: u4 g! g* W, v( \* Rvoid MD5Init (context)
7 w0 J3 A0 R7 M7 B0 WMD5_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 |9 q( O3 w. {
/* 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 */
unsigned int inputLen; /* length of input block */
. @3 ~0 \& k/ H! h+ Q{
unsigned int i, index, partLen;
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/* 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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