md5加密算法C++程序

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#include "global.h"
# W- Z) f/ q8 t* ~. t1 Q9 g$ J#include "md5.h"
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3 S2 c6 \8 U- D4 X/* Constants for MD5Transform routine.
*/

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5 o @2 }5 m, _# A" j+ O#define S11 7
+ K' g9 a7 S: I4 X7 v#define S12 12
% m% a$ P5 I, z( V1 z; J/ X#define S13 17
0 c5 b8 _8 I; u% m/ t8 Q5 k#define S14 22
+ {% Z' v7 f/ c# T. ? q#define S21 5
7 Q+ }' O7 u* w, Z#define S22 9
! ~. V/ t! l( V#define S23 14
7 r4 X" b7 ~4 z2 h#define S24 20
#define S31 4
#define S32 11
L0 K) x) H# a' z#define S33 16
* L3 z* f( b; S/ L1 c U! k, k#define S34 23
#define S41 6
g9 L' a3 y( v1 \. v8 `7 P#define S42 10
! M& J$ w) I4 ~6 m2 A$ q5 Q# f5 B#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));
6 v3 D, W9 j& z. ?" @5 sstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
9 M) m; i; f }: F% k8 J9 K9 dstatic 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
};

# u. h8 S) U' H4 E/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
" b% J7 h4 W$ \& e$ ?5 e" @4 e#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.
*/
7 y! U0 ~4 y# I3 C* f4 \#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

, _0 D( H3 k% T; ^: _7 y, \2 q/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
( r, G% e l3 RRotation is separate from addition to prevent recomputation.
*/
4 p. _; `% ?! |# o#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
$ i% {& h% f# j6 h5 d#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
8 }; o; W! C( c! X! h* G3 `* h#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
- V: v: {8 [6 _#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.
*/
void MD5Init (context)
" N" B+ z: A) X" U3 `4 M$ q' J) `( IMD5_CTX *context; /* context */
% ~/ G; u( |1 s f8 |{
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;
}
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) ~+ ^7 l' Y& F8 |' b) O8 T* R* |/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
- ?* {3 g P8 L, Y; ~) u. O1 Gvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
5 n1 b- a, @2 l% `" i+ k( Dunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
) V" n' N: O7 R5 Z# O% ?: V{
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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