md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/
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#define S11 7
$ P9 Y3 Y5 s. b- \/ x#define S12 12
#define S13 17
9 [9 z8 c6 o E$ F5 `#define S14 22
. H5 Q: L, S& z4 ~; D#define S21 5
' a, y0 F+ }9 e$ h#define S22 9
6 M( @! U7 n4 v8 w1 R2 T#define S23 14
% {6 Z' d+ k9 z6 e$ X+ n. v#define S24 20
#define S31 4
#define S32 11
- L. @. g8 |2 b* U) I& b3 |) g#define S33 16
: l5 h; w& x3 g" e- g2 m8 @( G#define S34 23
% R0 r/ G4 Q5 z D2 _. j0 g#define S41 6
#define S42 10
#define S43 15
* C: U7 d3 [: S#define S44 21
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" G3 A2 F4 }- U* zstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
5 V, F' Z! k& b7 M, [% Y$ ?- rstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
8 `' ^) h( ], b$ ?& \# W1 astatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
$ h1 L. s. h) l/ H- Cstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
. M' F% g9 ~1 X. gstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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; `7 R$ Q; g# Y& @; [% tstatic 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
};
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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)))
7 w6 l5 R; v. x* }+ |8 Y#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
- c& F. B+ v _- R! a w4 h/ r#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.
*/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
+ { U( ~) y7 X4 @ p#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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7 C# P" S. ~$ E3 m# O, y# Z/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void 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;
3 c4 f- d* r8 }+ o: b}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
9 b( d# A) i+ c2 C, }MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
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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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