md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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0 H: e: q: B w/* Constants for MD5Transform routine.
*/

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, L/ \9 D, e; w- J7 I#define S11 7
# ~7 m \) K0 M7 w7 a) r I7 E#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
9 P! Z) [. L) V, Z1 O#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
3 i6 M( J" Z3 a2 R#define S34 23
#define S41 6
E+ R9 s B6 Q" \! x#define S42 10
H( P* M2 b1 @1 M- l1 s#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
s; R8 y/ Z0 O% {' Sstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
5 [/ d' t7 k5 J, _/ T1 F& N8 zstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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# Z! ]" b' ^5 n. a* L, Ustatic 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
};

/ b S& ~1 y# r/* F, G, H and I are basic MD5 functions.
*/
5 h: p0 i( A3 J* `#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
& q) z2 U5 O, t2 [8 j#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
+ c/ k3 Z9 X, i, L; h8 N& d) s6 f#define I(x, y, z) ((y) ^ ((x) | (~z)))
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0 ~. j0 L1 _$ t# I1 K/* ROTATE_LEFT rotates x left n bits.
*/
. N: o$ W) f# V1 c#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

+ z$ D: }$ P: @/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
/ E% |* C& X. F0 y6 h G- d#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); \
}
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8 P8 @/ Z J6 u8 @6 u. U/ j/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
' M: Z+ p% C! U& f$ a( O5 e" kvoid MD5Init (context)
5 R# w* W2 |1 f, D7 ^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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* a% c, }2 m `9 |/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
5 L6 ^ I& K) P" |void MD5Update (context, input, inputLen)
- N! ]% n( X3 N! _# x4 wMD5_CTX *context; /* context */
+ E( R N/ C$ d/ f4 U1 w, z9 ~unsigned char *input; /* input block */
unsigned 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);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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