md5加密算法C++程序

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#include "global.h"
) ~* f$ m: u3 J+ x#include "md5.h"
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8 K* B- g2 z6 A- X; b9 c/* Constants for MD5Transform routine.
*/
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1 K& L3 v, u6 p7 g#define S11 7
0 ]+ C& H5 v3 ~7 N" G) g' I#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
8 Z8 l ?* V5 \#define S23 14
6 B2 ^6 N; j. ]8 x# W5 m& }4 \#define S24 20
, Z- m. Q9 B1 Q# j+ O$ k#define S31 4
8 U. }9 N- `* M1 o7 h#define S32 11
#define S33 16
3 K K. I; e7 J3 T: \#define S34 23
& L) x2 e) A% v% d3 E7 t#define S41 6
9 i( j+ g+ j& U) L#define S42 10
#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
# W+ e' e p" @& B( h5 Tstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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( W) ]) s0 j" z1 `2 O6 ]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.
*/
6 ?2 a' l- c3 v2 j6 f& g: M; F#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
& }9 A% B7 C2 `4 J* a#define H(x, y, z) ((x) ^ (y) ^ (z))
& n7 i" H! T! [0 w* B#define I(x, y, z) ((y) ^ ((x) | (~z)))

. @( {9 G1 O4 S r( R/* ROTATE_LEFT rotates x left n bits.
*/
, T/ {: v. ^4 J: j/ B#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- ] `/ E! M* i, y0 W#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
6 G: e9 x5 d2 @- \' z#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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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
. Q% ?2 e! i9 k9 |; N {void MD5Init (context)
MD5_CTX *context; /* context */
# d+ E. p3 S+ j& C, z' p- C{
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;
8 @' ]5 Y. s* X, p+ z}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
( O7 s; }2 u5 Y: Funsigned char *input; /* input block */
. \1 j% C; k$ G+ K: t! F+ b3 Munsigned int inputLen; /* length of input block */
9 i0 g% g9 `$ s. {+ x( h{
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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