md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/
& S2 Q: U# g/ i4 W0 {

; X1 z& f1 i# M3 o#define S11 7
#define S12 12
U6 g+ G1 ^' y# f#define S13 17
#define S14 22
' g0 Y7 [3 I8 R6 ~#define S21 5
3 ^% K$ ?1 `5 m' t* j% h#define S22 9
#define S23 14
#define S24 20
2 @5 C' ^& z0 w K" y#define S31 4
& m) g, t- j* }- m M- p#define S32 11
#define S33 16
#define S34 23
$ V/ l: U" \, }5 @' j* G; n#define S41 6
6 C- g3 w. ^+ _* y0 `#define S42 10
#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
8 n3 Y! o' o6 G& T! istatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
$ p' F; H9 a: j: ?8 Wstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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
7 c- L2 V3 Y; T% e8 B: Q0 L};

& J4 C9 B5 R+ {. _/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
. o' _8 p' m0 r7 t" ?9 U* I9 K& Y#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
8 L! }& m* P, u7 Q#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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. J L8 w J A0 {/* ROTATE_LEFT rotates x left n bits.
*/
/ L# K7 Q) T5 E/ v$ ?0 h#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
) w: D$ u/ F. N3 wRotation is separate from addition to prevent recomputation.
*/
" ?* X' L4 y- a! z. G. ~#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); \
}
l P5 @, W. L! ~ f: O#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
6 R- J8 D+ D8 k3 Xvoid MD5Init (context)
4 X: |) q+ r0 P$ ~6 jMD5_CTX *context; /* context */
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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;
5 a. w# s+ s' L}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
% r; g+ J* G& Vvoid MD5Update (context, input, inputLen)
( A2 _+ W Y0 @+ h' D: f, vMD5_CTX *context; /* context */
unsigned char *input; /* input block */
& G1 F# O" M9 a$ Runsigned int inputLen; /* length of input block */
5 f4 X9 } i, I{
unsigned int i, index, partLen;
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/* 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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