md5加密算法C++程序

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#include "global.h"
8 T5 G. u5 a* R9 ]9 M( p5 D$ [#include "md5.h"
- a% v& [7 {6 t& a
0 _8 q8 G) T( c% O% m2 |/* Constants for MD5Transform routine.
*/
2 G* ~% i" t" P- ]* a! i
3 }/ o9 u3 @* h6 X4 `+ q9 y M
#define S11 7
#define S12 12
4 _# z8 _" a/ D; J7 |#define S13 17
#define S14 22
#define S21 5
9 e! d7 P/ Y. w2 V$ G$ n+ W#define S22 9
#define S23 14
#define S24 20
. `1 Q; T5 M9 ^: W3 U4 E0 p* |#define S31 4
#define S32 11
3 W# t1 v9 ~6 t( v#define S33 16
. F2 a; a' o4 C7 v#define S34 23
& ~$ x2 N% F( H, C; p#define S41 6
0 j# a; V, W' h0 E+ x#define S42 10
#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));
2 J9 X. G! X1 G0 gstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
1 N1 f6 R! O# O2 v8 y; I1 H7 Gstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

2 x4 a. Y% h' F4 ^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.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
9 n% Z6 L# u% Q' V1 c#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
8 B, f/ u- d3 \* T% P#define I(x, y, z) ((y) ^ ((x) | (~z)))

, J/ Z+ K4 z: X8 N/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

* I8 n S8 e6 X9 g7 [5 I0 F/* 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); \
}
' ~9 h0 F! I& Y' v4 n3 ^/ R/ r#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); \
}

% _6 L( c& K3 F L+ i* v% q! V5 y/* 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;
0 c2 h; s' \+ v}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
3 \( l, Y& q# T& F( d5 b8 f- qMD5_CTX *context; /* context */
8 W& s* e) d; I. Z/ sunsigned char *input; /* input block */
+ J% q! q- [# v$ e" b6 vunsigned 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);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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