md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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" W7 z& J7 E4 w/* Constants for MD5Transform routine.
*/
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#define S11 7
4 B2 e% P1 C. [) r+ {3 _#define S12 12
#define S13 17
#define S14 22
$ r& B( t N; Q" j#define S21 5
K8 H( |8 Q5 f#define S22 9
X! E9 u8 F% Q% p/ L% b/ Z#define S23 14
#define S24 20
. e" j r' A/ b; ~( `# L#define S31 4
#define S32 11
#define S33 16
#define S34 23
' q/ v1 b& p6 T* X ~: t0 H3 B#define S41 6
#define S42 10
& \4 l3 n2 S9 Q7 V2 w, e' D#define S43 15
5 [6 w+ d2 \4 y* i#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
3 a: F4 k' L3 P. a5 Mstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
& c+ }5 _8 P/ E' Z8 fstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
0 l& `" R1 f) v: u- i+ A; p; Sstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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3 T& ~9 U3 L! i; istatic 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.
*/
+ W) t9 V. V8 U# o#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))
#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))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
: U1 b* V' n- ?, a#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); \
}
c3 G& Y3 }$ q W0 j#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); \
}

3 F/ J" Y. `8 e- ~/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
/ p* L( K+ Q% ]* y; fvoid 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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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
4 Y; y% l6 |' G% yvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
, B, B: W$ {* P. S4 i3 e9 ^) Bunsigned 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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