md5加密算法C++程序

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#include "global.h"
#include "md5.h"

' a% X. _! c4 c/* Constants for MD5Transform routine.
*/


5 y8 v3 }1 l. R) D& A; v+ n#define S11 7
, o( t+ V: m. l" u& X! Y#define S12 12
7 Q" c( j: H+ K u# M#define S13 17
#define S14 22
#define S21 5
#define S22 9
9 T5 ~( j0 i, a" H w#define S23 14
. z0 k) K% }+ S- }7 r#define S24 20
! p6 {- b/ H# l( O#define S31 4
#define S32 11
#define S33 16
#define S34 23
1 E5 ]6 `) A$ ^3 v2 h! \ e# r#define S41 6
, F; H- x7 @! T) \) G, K- m#define S42 10
#define S43 15
0 k: |* j e% G$ ^( P#define S44 21

: s5 t" k9 n! }static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
# @3 ^: x o) ^4 w! H! vstatic 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));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

0 I" x( u' t9 X4 W: L, astatic 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
8 n1 P- n0 T; ~" `: C};
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/* F, G, H and I are basic MD5 functions.
*/
- h9 ^/ [8 [ F% B#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
* z' ?9 F$ e- D9 ]% H, M9 I" ]9 a; [#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)))
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/* ROTATE_LEFT rotates x left n bits.
*/
& ?0 C. b. e4 U$ R#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

$ M2 u/ G$ {2 F8 |( W, U/ p/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
& r3 p4 F5 S" ~Rotation 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); \
}
' d) `: |( _6 S8 r1 o#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
/ \! f4 n9 d+ U, z" a#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 |' z3 i+ ], F+ Q#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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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
7 O% s; M6 T. C' |: K p. Svoid MD5Init (context)
4 U( u( h- \" v+ e" wMD5_CTX *context; /* context */
% G3 d3 n4 i4 C3 g9 A{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
, _7 p) w3 S O/ M, m# u0 m2 @: A) D*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
5 a7 K$ d/ D3 O2 y6 `- F}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
! U% {3 ~6 \0 p" rvoid MD5Update (context, input, inputLen)
4 ]- N0 R" N7 r$ \3 Z8 o8 WMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
+ \0 g/ n0 h4 {, }# X% \{
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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